CN203179898U - Film transistor, array substrate and display device - Google Patents
Film transistor, array substrate and display device Download PDFInfo
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- CN203179898U CN203179898U CN 201320178233 CN201320178233U CN203179898U CN 203179898 U CN203179898 U CN 203179898U CN 201320178233 CN201320178233 CN 201320178233 CN 201320178233 U CN201320178233 U CN 201320178233U CN 203179898 U CN203179898 U CN 203179898U
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Abstract
The utility model relates to technical field of film transistor display, and discloses a film transistor, an array substrate and a display device. The film transistor includes a gate electrode, an active layer and a source/drain electrode, and a gate insulating layer between the gate electrode and the active layer, wherein the gate electrode comprises a gate electrode metal layer and a first group of protective layers, the first group of protective layers are located between the gate electrode metal layer and the gate insulating layer, the active layer and the gate electrode metal layer are isolated, and the gate electrode metal layer is made of copper or a copper alloy. By using the technical solution of the utility model, the first group of protective layers separate the gate electrode metal layer and the active layer, therefore, contamination to the active layer by copper diffusion is prevented, and the product yield is greatly improved.
Description
Technical field
The utility model relates to thin-film transistor Display Technique field, particularly relates to a kind of thin-film transistor, array base palte and display unit.
Background technology
In panel display apparatus, Thin Film Transistor-LCD (Thin Film Transistor Liquid Crystal Display, be called for short TFT-LCD) have that volume is little, low in energy consumption, manufacturing cost is relatively low and characteristics such as low radiation, occupied leading position in current flat panel display market.
Oxide thin film transistor (Oxide Thin Film Transistor, be called for short OTFT) have an advantage such as ultra-thin, in light weight, low power consumption, not only can be for the manufacture of display panels, and be Organic Light Emitting Diode (the Organic Light-Emitting Diode of organic electroluminescence display panel of new generation, abbreviation OLED) application provides may, the more existing thin-film transistor of this Organic Light Emitting Diode, its color is more gorgeous and image is more clear.
Existing array base palte preparation technology is that sputter forms gate electrode on underlay substrate, deposition gate insulation layer, deposition active layer, sputtering source/drain electrode, deposit passivation layer, sputter pixel electrode.
The defective that prior art exists is, adopts gate electrode and the source/drain electrode of copper or copper alloy made, because copper is more active, diffuses into active layer easily, and therefore, copper easily pollutes active layer, thereby has influenced the mobility of charge carrier rate, finally causes product defects.
The utility model content
The purpose of this utility model provides a kind of thin-film transistor, array base palte and display unit, in order to avoid the pollution of copper diffusion couple active layer, improves the yield of product.
The utility model thin-film transistor, described thin-film transistor comprises gate electrode, active layer and source/drain electrode, and the gate insulation layer between described gate electrode and active layer, wherein:
Described gate electrode comprises gate electrode metal layer and first group of protective layer, and described first group of protective layer isolated described active layer and described gate electrode metal layer between gate electrode metal layer and gate insulation layer;
The material of described gate electrode metal layer is copper or copper alloy.
Preferably, institute's gate electrode also comprises second group of protective layer, is positioned at the side that the gate electrode metal layer deviates from first group of protective layer;
Described second group of protective layer comprises first grid protective layer and the second grid protective layer, and the described second grid protective layer is between first grid protective layer and gate electrode metal layer.
Preferable, the material of described first grid protective layer is silicon nitride or titanium nitride; And/or
The material of the described second grid protective layer is molybdenum titanium alloy; molybdenum and tungsten alloy; the molybdenum zircaloy; the molybdenum niobium alloy; molybdenum-copper; the molybdenum vanadium alloy; the molybdenum tantalum alloy; Mo-Ni alloy; the molybdenum evanohm; the molybdenum hafnium alloy; the molybdenum rhodium alloy; the molybdenum cobalt alloy; the molybdenum palldium alloy; the molybdenum platinum alloy; the molybdenum aluminium alloy; molybdenum manganese alloy; titanium silicide; tungsten silicide; zirconium silicide; niobium silicide; copper silicide; vanadium silicide; tantalum silicide; nickle silicide; chromium silicide; hafnium suicide; the silication rhodium; cobalt silicide; palladium silicide; platinum silicide; silicated aluminum or silication manganese.
Preferably, described first group of protective layer comprises the 3rd grid protective layer and the 4th grid protective layer, and described the 3rd grid protective layer is between gate electrode metal layer and the 4th grid protective layer.
Preferable, the material of described the 3rd grid protective layer is molybdenum aluminium niobium alloy, molybdenum and tungsten alloy, molybdenum zircaloy, molybdenum vanadium alloy, molybdenum tantalum alloy, Mo-Ni alloy, molybdenum evanohm, molybdenum cobalt alloy, molybdenum palldium alloy, molybdenum platinum alloy, molybdenum hafnium alloy, molybdenum rhodium alloy, molybdenum manganese alloy, molybdenum silicide or molybdenum titanium alloy; And/or
The material of described the 4th grid protective layer is molybdenum nitride; the nitrogen molybdenum silicide; the aluminium nitride molybdenum; the copper nitride molybdenum; the nitrogenize tungsten; the zirconium nitride molybdenum; the hafnium nitride molybdenum; the rhodium nitrate molybdenum; the vanadium nitride molybdenum; the tantalum nitride molybdenum; the nickel oxide molybdenum; the nitrogenize chrome molybdenum; the cobalt nitride molybdenum; nitrogenize palladium molybdenum; the platinum nitride molybdenum; the nitrogenized manganese molybdenum; the titanium nitride molybdenum; the chlorine molybdenum silicide; the aluminium chloride molybdenum; the copper chloride molybdenum; the chlorination tungsten; the zirconium chloride molybdenum; the hafnium chloride molybdenum; the radium chloride molybdenum; the vanadium chloride molybdenum; the tantalic chloride molybdenum; the nickel chloride molybdenum; the chlorination chrome molybdenum; the cobalt chloride molybdenum; the palladium bichloride molybdenum; the platinum chloride molybdenum; the manganese chloride molybdenum; the titanium chloride molybdenum; the phosphorus molybdenum silicide; the aluminum phosphate molybdenum; the phosphorized copper molybdenum; the phosphatization tungsten; the zirconium phosphide molybdenum; phosphatization hafnium molybdenum; phosphatization rhodium molybdenum; phosphatization vanadium molybdenum; phosphatization tantalum molybdenum; the nickel phosphide molybdenum; the phosphatization chrome molybdenum; phosphatization cobalt molybdenum; phosphatization palladium molybdenum; phosphatization platinum molybdenum; phosphatization manganese molybdenum or phosphatization titanium molybdenum.
Preferably, the source/drain electrode of described thin-film transistor comprises source/drain electrode metal level and second source/leakage protective layer, and described second source/leakage protective layer is isolated source/drain electrode metal level and active layer between source/drain electrode metal level and active layer;
The material of described source/drain electrode metal level is copper or copper alloy.
Preferably, the material of described second source/leakage protective layer is molybdenum titanium alloy, molybdenum and tungsten alloy, molybdenum zircaloy, molybdenum niobium alloy, molybdenum-copper, molybdenum vanadium alloy, molybdenum tantalum alloy, Mo-Ni alloy, molybdenum evanohm, molybdenum hafnium alloy, molybdenum rhodium alloy, molybdenum cobalt alloy, molybdenum palldium alloy, molybdenum platinum alloy, molybdenum aluminium alloy, molybdenum manganese alloy, titanium silicide, tungsten silicide, zirconium silicide, niobium silicide, copper silicide, vanadium silicide, tantalum silicide, nickle silicide, chromium silicide, hafnium suicide, silication rhodium, cobalt silicide, palladium silicide, platinum silicide, silicated aluminum or silication manganese.
Preferably, described source/drain electrode also comprises the 3rd group of protective layer, is positioned at the side that source/drain electrode metal level deviates from second source/leakage protective layer;
Described the 3rd group of protective layer comprises the 3rd source/leakage protective layer and the 4th source/leakage protective layer, and described the 3rd source/leakage protective layer is between source/drain electrode metal level and the 4th source/leakage protective layer.
Preferable, the material of described the 3rd source/leakage protective layer is molybdenum aluminium niobium alloy, molybdenum and tungsten alloy, molybdenum zircaloy, molybdenum vanadium alloy, molybdenum tantalum alloy, Mo-Ni alloy, molybdenum evanohm, molybdenum cobalt alloy, molybdenum palldium alloy, molybdenum platinum alloy, molybdenum hafnium alloy, molybdenum rhodium alloy, molybdenum manganese alloy, molybdenum silicide or molybdenum titanium alloy; And/or
The material of described the 4th source/leakage protective layer is molybdenum nitride; the nitrogen molybdenum silicide; the aluminium nitride molybdenum; the copper nitride molybdenum; the nitrogenize tungsten; the zirconium nitride molybdenum; the hafnium nitride molybdenum; the rhodium nitrate molybdenum; the vanadium nitride molybdenum; the tantalum nitride molybdenum; the nickel oxide molybdenum; the nitrogenize chrome molybdenum; the cobalt nitride molybdenum; nitrogenize palladium molybdenum; the platinum nitride molybdenum; the nitrogenized manganese molybdenum; the titanium nitride molybdenum; the chlorine molybdenum silicide; the aluminium chloride molybdenum; the copper chloride molybdenum; the chlorination tungsten; the zirconium chloride molybdenum; the hafnium chloride molybdenum; the radium chloride molybdenum; the vanadium chloride molybdenum; the tantalic chloride molybdenum; the nickel chloride molybdenum; the chlorination chrome molybdenum; the cobalt chloride molybdenum; the palladium bichloride molybdenum; the platinum chloride molybdenum; the manganese chloride molybdenum; the titanium chloride molybdenum; the phosphorus molybdenum silicide; the aluminum phosphate molybdenum; the phosphorized copper molybdenum; the phosphatization tungsten; the zirconium phosphide molybdenum; phosphatization hafnium molybdenum; phosphatization rhodium molybdenum; phosphatization vanadium molybdenum; phosphatization tantalum molybdenum; the nickel phosphide molybdenum; the phosphatization chrome molybdenum; phosphatization cobalt molybdenum; phosphatization palladium molybdenum; phosphatization platinum molybdenum; phosphatization manganese molybdenum or phosphatization titanium molybdenum.
Preferably, for above-mentioned thin-film transistor, described thin-film transistor is bottom gate thin film transistor or top gate type thin film transistor.
Preferably, for above-mentioned thin-film transistor, the material of described active layer is metal-oxide semiconductor (MOS), crystal silicon or amorphous silicon.
The utility model also relates to a kind of array base palte, comprises above-mentioned thin-film transistor.
The utility model also relates to a kind of display unit, comprises above-mentioned array base palte.
In the utility model thin-film transistor, owing to adopt first group of protective layer that itself and active layer are kept apart to copper or the copper alloy of gate electrode metal layer, therefore, avoided copper diffuse pollution active layer, make carrier mobility normal, improved the yield of product greatly.
Description of drawings
Fig. 1 is the array base-plate structure schematic diagram that comprises the utility model thin-film transistor;
Fig. 2 is the partial structurtes enlarged drawing in the gate electrode A district of thin-film transistor among Fig. 1;
Fig. 3 is the gate electrode structure schematic diagram of the utility model thin-film transistor;
Fig. 4 is the partial structurtes enlarged drawing in the source/drain electrode B district of thin-film transistor among Fig. 1.
Reference numeral:
1-underlay substrate 2-gate electrode 3-gate insulation layer 4-active layer 5-etching barrier layer
6-source/drain electrode 7-passivation layer 8-pixel electrode 21-first grid protective layer 22-second grid the protective layer
Second group of protective layer of 23-gate electrode metal layer 24-the 3rd grid protective layer 25-the 4th grid protective layer 31-
First group of protective layer 62-of 32-, second source/leakage protective layer 63-source/drain electrode metal level
64-the 3rd source/leakage protective layer 65-the 4th source/leakage protective layer
Embodiment
As the pollution of gate electrode to active layer, improve the yield of product for fear of copper or copper alloy, the utility model provides a kind of thin-film transistor and manufacture method, array base palte and display unit.In this technical scheme, adopt first group of protective layer that gate electrode metal layer and active layer are kept apart, prevented that copper from diffusing into the variation that active layer causes carrier mobility, thereby improved the yield of product.
As depicted in figs. 1 and 2, Fig. 1 is the array base-plate structure schematic diagram that comprises the utility model thin-film transistor, Fig. 2 is the partial enlarged drawing of the gate electrode of Fig. 1 thin-film transistor, the array base palte that the utility model provides, comprise a plurality of thin-film transistors that are arranged in array, thin-film transistor in Fig. 1 array base palte is bottom gate type, the utility model also is applicable to the thin-film transistor of top gate type, thin-film transistor of the present utility model, described thin-film transistor comprises gate electrode 2, active layer 4 and source/drain electrode 6, and the gate insulation layer 3 between gate electrode 2 and active layer 4, wherein:
Gate electrode 2 comprises gate electrode metal layer 23 and 24, the first groups of protective layers 24 of first group of protective layer between gate electrode metal layer 23 and gate insulation layer 3, and active layer 4 and gate electrode metal layer 23 are isolated;
The material of gate electrode metal layer 23 is copper or copper alloy.
In the utility model embodiment; no matter be top gate type or bottom gate thin film transistor; because adopting first group of protective layer isolates active layer and gate electrode metal layer; therefore avoided the copper in the gate electrode metal layer to diffuse in the active layer; cause the pollution of active layer, and then improved the yield of product.
Preferably, as shown in Figure 2, described gate electrode also comprises and is positioned at second group of protective layer 31 that gate electrode metal layer 23 deviates from first group of protective layer 32;
As shown in Figure 3, described second group of protective layer 31 comprises that first grid protective layer 21 and the second grid protective layer, 22, the second grid protective layers 22 are between gate electrode metal layer 23 and first grid protective layer 21.
Preferable, the material of described first grid protective layer 21 is silicon nitride or titanium nitride; And/or
The material of the described second grid protective layer 22 is molybdenum titanium alloy; molybdenum and tungsten alloy; the molybdenum zircaloy; the molybdenum niobium alloy; molybdenum-copper; the molybdenum vanadium alloy; the molybdenum tantalum alloy; Mo-Ni alloy; the molybdenum evanohm; the molybdenum hafnium alloy; the molybdenum rhodium alloy; the molybdenum cobalt alloy; the molybdenum palldium alloy; the molybdenum platinum alloy; the molybdenum aluminium alloy; molybdenum manganese alloy; titanium silicide; tungsten silicide; zirconium silicide; niobium silicide; copper silicide; vanadium silicide; tantalum silicide; nickle silicide; chromium silicide; hafnium suicide; the silication rhodium; cobalt silicide; palladium silicide; platinum silicide; silicated aluminum or silication manganese.
In the utility model embodiment, first grid protective layer can increase the adhesive force of gate electrode and substrate, and the second grid protective layer also can prevent the diffusion of copper in the gate electrode metal layer.And among the utility model embodiment, first grid protective layer can be individual layer, also can be multilayer, sandwich construction forms with the structure of silicon nitride and titanium nitride stack, for example the first grid protective layer of the silicon nitride layer that forms successively on underlay substrate, the formation of titanium nitride layer double-layer structure; The second grid protective layer also can be individual layer, also can be multilayer, adopts the material of the above-mentioned second grid protective layer to form sandwich construction, as two-layer, three layers or four layers.The material that first grid protective layer adopts can be silicon nitride or titanium nitride, can also adopt other inorganic insulating materials identical or close with the material behavior of above-mentioned each material, and the thickness of first grid protective layer is 10nm-300nm; The material of the main employing of the second grid protective layer is the alloy material of molybdenum (Mo), titanium (Ti), silicon (Si) codope; wherein the Ti element can be replaced by tungsten (W), zirconium (Zr), niobium (Nb), copper (Cu), vanadium (V), tantalum (Ta), nickel (Ni), chromium (Cr), hafnium (Hf), rhodium (Rh), cobalt (Co), palladium (Pd), platinum (Pt), aluminium (Al) or manganese (Mn), can also adopt other metals identical or close with the material behavior of above-mentioned each material.
Preferably, as shown in Figure 3, described first group of protective layer 32 comprises that the 3rd grid protective layer 24 and the 4th grid protective layer 25, the three grid protective layers 24 are between gate electrode metal layer 23 and the 4th grid protective layer 25.
Preferable, the material of described the 3rd grid protective layer 24 is molybdenum aluminium niobium alloy, molybdenum and tungsten alloy, molybdenum zircaloy, molybdenum vanadium alloy, molybdenum tantalum alloy, Mo-Ni alloy, molybdenum evanohm, molybdenum cobalt alloy, molybdenum palldium alloy, molybdenum platinum alloy, molybdenum hafnium alloy, molybdenum rhodium alloy, molybdenum manganese alloy, molybdenum silicide or molybdenum titanium alloy; And/or
The material of described the 4th grid protective layer 25 is molybdenum nitride; the nitrogen molybdenum silicide; the aluminium nitride molybdenum; the copper nitride molybdenum; the nitrogenize tungsten; the zirconium nitride molybdenum; the hafnium nitride molybdenum; the rhodium nitrate molybdenum; the vanadium nitride molybdenum; the tantalum nitride molybdenum; the nickel oxide molybdenum; the nitrogenize chrome molybdenum; the cobalt nitride molybdenum; nitrogenize palladium molybdenum; the platinum nitride molybdenum; the nitrogenized manganese molybdenum; the titanium nitride molybdenum; the chlorine molybdenum silicide; the aluminium chloride molybdenum; the copper chloride molybdenum; the chlorination tungsten; the zirconium chloride molybdenum; the hafnium chloride molybdenum; the radium chloride molybdenum; the vanadium chloride molybdenum; the tantalic chloride molybdenum; the nickel chloride molybdenum; the chlorination chrome molybdenum; the cobalt chloride molybdenum; the palladium bichloride molybdenum; the platinum chloride molybdenum; the manganese chloride molybdenum; the titanium chloride molybdenum; the phosphorus molybdenum silicide; the aluminum phosphate molybdenum; the phosphorized copper molybdenum; the phosphatization tungsten; the zirconium phosphide molybdenum; phosphatization hafnium molybdenum; phosphatization rhodium molybdenum; phosphatization vanadium molybdenum; phosphatization tantalum molybdenum; the nickel phosphide molybdenum; the phosphatization chrome molybdenum; phosphatization cobalt molybdenum; phosphatization palladium molybdenum; phosphatization platinum molybdenum; phosphatization manganese molybdenum or phosphatization titanium molybdenum.
In the utility model embodiment, first group protective layer used in gate electrode metal layer and active layer are isolated, first group of double-layer structure formation that protective layer preferably adopts the 3rd grid protective layer and the 4th grid protective layer to constitute, the 3rd grid protective layer can be the single layer structure of a kind of formation in the above-mentioned material that forms the 3rd grid protective layer, also can be the laminated construction of two or more formation; The 4th grid protective layer can be the single layer structure of a kind of formation in the above-mentioned material that forms the 4th grid protective layer, also can be the laminated construction of two or more formation.The 3rd grid protective layer; its material can be the alloy material of the formation of Mo, Al, three kinds of metals of Nb; wherein; Al can be by element substitutions such as W, Zr, V, Ta, Ni, Cr, Co, Pd, Pt, Hf, Rh, Mn, Ti, Si, and Nb can be replaced by elements such as W, Zr, V, Ta, Ni, Cr, Co, Pd, Pt, Hf, Rh, Mn, Ti, Si simultaneously.
Preferably, as shown in Figure 1 and Figure 4, source/the drain electrode 6 of described thin-film transistor comprises source/drain electrode metal level 63 and second source/leakage protective layer 62, the second sources/leakage protective layer 62 between source/drain electrode metal level 63 and active layer 4, and source/drain electrode metal level 63 and active layer 4 are isolated;
The material of described source/drain electrode metal level 63 is copper or copper alloy.
Similar with gate electrode; source/drain electrode is also adopted the source/drain electrode metal level of copper or copper alloy preparation; design second source/leakage protective layer is isolated both between source/drain electrode metal level and active layer; avoid the variation of the carrier mobility that the copper diffuse pollution active layer in source/drain electrode metal level causes, and then improve the yield of product.
Preferably, the material of second source/leakage protective layer 62 is molybdenum titanium alloy, molybdenum and tungsten alloy, molybdenum zircaloy, molybdenum niobium alloy, molybdenum-copper, molybdenum vanadium alloy, molybdenum tantalum alloy, Mo-Ni alloy, molybdenum evanohm, molybdenum hafnium alloy, molybdenum rhodium alloy, molybdenum cobalt alloy, molybdenum palldium alloy, molybdenum platinum alloy, molybdenum aluminium alloy, molybdenum manganese alloy, titanium silicide, tungsten silicide, zirconium silicide, niobium silicide, copper silicide, vanadium silicide, tantalum silicide, nickle silicide, chromium silicide, hafnium suicide, silication rhodium, cobalt silicide, palladium silicide, platinum silicide, silicated aluminum or silication manganese.
The material of second source/leakage protective layer is consistent with the material of the second grid protective layer, and in like manner, second source/leakage protective layer can also can be two kinds in the above-mentioned material even the laminated construction of multiple formation for the single layer structure of above-mentioned material formation.
Preferably, as shown in Figure 4, source/drain electrode also comprises the 3rd group of protective layer, is positioned at the side that source/drain electrode metal level 63 deviates from second source/leakage protective layer 62;
The 3rd group of protective layer comprises that the 3rd source/leakage protective layer 64 and the 4th source/leakage protective layer 65, the three sources/leakage protective layer 64 are between source/drain electrode metal level 63 and the 4th source/leakage protective layer 65.
Preferable, the material of described the 3rd source/leakage protective layer 64 is molybdenum aluminium niobium alloy, molybdenum and tungsten alloy, molybdenum zircaloy, molybdenum vanadium alloy, molybdenum tantalum alloy, Mo-Ni alloy, molybdenum evanohm, molybdenum cobalt alloy, molybdenum palldium alloy, molybdenum platinum alloy, molybdenum hafnium alloy, molybdenum rhodium alloy, molybdenum manganese alloy, molybdenum silicide or molybdenum titanium alloy; And/or
The material of described the 4th source/leakage protective layer 65 is molybdenum nitride; the nitrogen molybdenum silicide; the aluminium nitride molybdenum; the copper nitride molybdenum; the nitrogenize tungsten; the zirconium nitride molybdenum; the hafnium nitride molybdenum; the rhodium nitrate molybdenum; the vanadium nitride molybdenum; the tantalum nitride molybdenum; the nickel oxide molybdenum; the nitrogenize chrome molybdenum; the cobalt nitride molybdenum; nitrogenize palladium molybdenum; the platinum nitride molybdenum; the nitrogenized manganese molybdenum; the titanium nitride molybdenum; the chlorine molybdenum silicide; the aluminium chloride molybdenum; the copper chloride molybdenum; the chlorination tungsten; the zirconium chloride molybdenum; the hafnium chloride molybdenum; the radium chloride molybdenum; the vanadium chloride molybdenum; the tantalic chloride molybdenum; the nickel chloride molybdenum; the chlorination chrome molybdenum; the cobalt chloride molybdenum; the palladium bichloride molybdenum; the platinum chloride molybdenum; the manganese chloride molybdenum; the titanium chloride molybdenum; the phosphorus molybdenum silicide; the aluminum phosphate molybdenum; the phosphorized copper molybdenum; the phosphatization tungsten; the zirconium phosphide molybdenum; phosphatization hafnium molybdenum; phosphatization rhodium molybdenum; phosphatization vanadium molybdenum; phosphatization tantalum molybdenum; the nickel phosphide molybdenum; the phosphatization chrome molybdenum; phosphatization cobalt molybdenum; phosphatization palladium molybdenum; phosphatization platinum molybdenum; phosphatization manganese molybdenum or phosphatization titanium molybdenum.
In the utility model embodiment, the material of the 3rd source/leakage protective layer is consistent with the material of the 3rd grid protective layer, in like manner, the 3rd source/leakage protective layer can be the single layer structure of a kind of formation in the above-mentioned material that forms the 3rd source/leakage protective layer, also can be two kinds in the above-mentioned material even the laminated construction of multiple formation; The material of the 4th source/leakage protective layer is consistent with the material of the 4th grid protective layer; in like manner; the 4th source/leakage protective layer can be the single layer structure of a kind of formation in the above-mentioned material that forms the 4th source/leakage protective layer, also can be the laminated construction of two kinds even multiple formation in the above-mentioned material.The 3rd layer of source/leakage protective layer and the 4th layer of source/leakage protective layer also are the diffusions for copper in the source of preventing/drain electrode metal level.
For above-mentioned thin-film transistor, described thin-film transistor is bottom gate thin film transistor or top gate type thin film transistor.
Preferably, as shown in Figure 1, the material of described active layer 4 is metal-oxide semiconductor (MOS), crystal silicon or amorphous silicon.
In the utility model embodiment, the improvement that gate electrode and/or source/drain electrode are done, not only can be applied in the metal oxide semiconductor films transistor, also can be applied in the polycrystal silicon film transistor or in the amorphous silicon film transistor, and in the array base palte that is formed by these thin-film transistors.
The utility model embodiment also provides a kind of array base palte, comprises above-mentioned thin-film transistor.As shown in Figure 1, the structural representation of the array base palte that forms for bottom gate thin film transistor, described array base palte comprises underlay substrate 1, on underlay substrate 1, can further comprise: grid line layer, gate insulation layer 3, active layer 4 etc.Described array base palte can be top gate type, also can be bottom gate type, be illustrated in figure 1 as the array base palte of the thin-film transistor formation of bottom gate type, its structure is specially: grid line layer (grid line of grid line layer comprises gate electrode 2 in each pixel cell) is formed on the underlay substrate 1, gate insulation layer 3 is formed on the grid line layer, active layer 4 is formed on the gate insulation layer 3, etching barrier layer 5(is used for preventing when data line layer from forming raceway groove the etching to active layer) on the cover part active layer 4, data line layer is formed on active layer 4 and the etching barrier layer 5, after adopting composition technology to carry out graphically to data line layer, formation source/drain electrode 6, passivation layer 7 covers whole base plate and also is formed with via hole above part source/drain electrode 6, and pixel electrode layer 8 parts are deposited into via hole and can conduct electricity with source/drain electrode 6 and be connected.
The utility model embodiment also provides a kind of display unit, it comprises above-mentioned any one array base palte, described display unit can for: liquid crystal panel, Electronic Paper, oled panel, LCD TV, LCD, DPF, mobile phone, panel computer etc. have product or the parts of any Presentation Function.
The utility model also provides a kind of method of manufacturing thin film transistor, comprising:
Form the pattern that comprises gate electrode at underlay substrate, described gate electrode comprises gate electrode metal layer and the first group of protective layer that is formed at successively on the underlay substrate, and wherein, the material of described gate electrode metal layer is copper or copper alloy;
Form the pattern that comprises gate insulation layer of covering grid electrode and underlay substrate at the substrate that forms gate electrode;
Form the pattern that comprises active layer that is positioned at above the gate electrode at the substrate that forms gate insulation layer, and be positioned at the pattern that comprises etching barrier layer on the active layer;
Form the pattern that comprises source/drain electrode at the substrate that forms etching barrier layer.
Preferably, described gate electrode comprises second group of protective layer, gate electrode metal layer and the first group of protective layer that is formed at successively on the underlay substrate.
Preferable, described second group of protective layer comprises first grid protective layer and the second grid protective layer that is formed at successively on the underlay substrate; Described first group of protective layer comprises the 3rd grid protective layer and the 4th grid protective layer that is formed at successively on the described gate electrode metal layer.
Preferably, described source/drain electrode comprises and is formed at the source of second on the etching barrier layer/leakage protective layer and source/drain electrode metal level successively.
Preferably, described source/drain electrode also comprises the 3rd group of protective layer on the source of being formed at/drain electrode metal level, and described the 3rd group of protective layer comprises the 3rd source/leakage protective layer and the 4th source/leakage protective layer on the source of being formed at successively/drain electrode metal level.
In the utility model embodiment, the thin-film transistor that this embodiment makes is the bottom gate type array base palte, when making gate electrode, make gate electrode metal layer and first group of protective layer successively, wherein, first group of protective layer can comprise the 3rd grid protective layer and the 4th grid protective layer that forms successively, in addition, can also on underlay substrate, make second group of protective layer, gate electrode metal layer and first group of protective layer successively, wherein, second group of protective layer comprises first grid protective layer and the second grid protective layer that forms successively; During making source/drain electrode; make second source/leakage protective layer and source/drain electrode metal level successively; in addition; can also be in the source/the drain electrode metal level makes the 3rd group of protective layer; the 3rd group of protective layer comprises the 3rd source/leakage protective layer and the 4th source/leakage protective layer of making successively; in this array base palte; at least one of gate electrode and source/drain electrode need be adopted above-mentioned technology preparation, and described composition technology generally includes cleaning, film forming, coating, exposure, development, does and carve or operations such as wet quarter, photoresist lift off.In the utility model embodiment, owing between gate electrode metal layer and active layer, be formed with the 3rd grid protective layer and the 4th grid protective layer, can prevent that the copper of gate electrode metal layer from diffusing into to active layer, improve the yield of product.
The utility model embodiment also provides another kind of method of manufacturing thin film transistor, comprising:
Form the pattern that comprises source/drain electrode at underlay substrate;
Form the pattern that comprises etching barrier layer of covering source/drain electrode and underlay substrate at the substrate of formation source/drain electrode;
The pattern that comprises active layer above the substrate formation that forms etching barrier layer is positioned at source/drain electrode;
Form the pattern that comprises gate insulation layer at the substrate that forms active layer;
Form the pattern that comprises gate electrode at the substrate that forms gate insulation layer, described gate electrode comprises first group of protective layer and the gate electrode metal layer that is formed at successively on the gate insulation layer, and wherein, the material of described gate electrode metal layer is copper or copper alloy.
Preferably, described gate electrode comprises first group of protective layer, gate electrode metal layer and the second group of protective layer that is formed at successively on the gate insulation layer.
Preferable, described first group of protective layer comprises the 4th grid protective layer and the 3rd grid protective layer that is formed at successively on the gate insulation layer; Described second group of protective layer comprises the second grid protective layer and the first grid protective layer that is formed at successively on the gate electrode metal layer.
Preferably, described source/drain electrode comprises source/drain electrode metal level and the second source/leakage protective layer that is formed at successively on the underlay substrate.
Preferably; described source/drain electrode comprises the 3rd group of protective layer, source/drain electrode metal level and the second source/leakage protective layer that is formed at successively on the underlay substrate; wherein, described the 3rd group of protective layer comprises and is formed at the source of the 4th on the underlay substrate/leakage protective layer and the 3rd source/leakage protective layer successively.
In the utility model embodiment, the thin-film transistor that this embodiment makes is top gate type thin film transistor, when making gate electrode, make first group of protective layer and gate electrode metal layer successively, wherein, first group of protective layer comprises the 4th grid protective layer and the 3rd grid protective layer of making successively, in addition, can also make first group of protective layer, gate electrode metal layer and second group of protective layer successively, wherein, second group of protective layer comprises the second grid protective layer and the first grid protective layer of making successively; During making source/drain electrode; make source/drain electrode metal level and second source/leakage protective layer successively; in addition; can also make the 3rd group of protective layer, source/drain electrode metal level and second source/leakage protective layer successively; wherein; the 3rd group of protective layer can comprise the 4th source/leakage protective layer and the 3rd source/leakage protective layer of making successively; in this array base palte; at least one of gate electrode and source/drain electrode need be adopted above-mentioned technology preparation, and described composition technology generally includes cleaning, film forming, coating, exposure, development, does and carve or operations such as wet quarter, photoresist lift off.In the utility model embodiment, owing between gate electrode metal layer and active layer, be formed with the 3rd grid protective layer and the 4th grid protective layer, can prevent that the copper of gate electrode metal layer from diffusing into to active layer, improve the yield of product.
Preferably, after making gate insulation layer, also comprise: adopt annealing process to handle gate insulation layer.
In the prior art, in making the technology of gate insulation layer, keep away and unavoidably make the group of hydrogen of mixing in the gate insulation layer, as hydroxyl (OH
-), hydrogen ion (H
+) and the protium etc. of absorption.The group of these hydrogen ruptures in the state of work easily in the manufacturing process of film transistor device and these devices, As time goes on the variation of environment, probably is diffused in the active layer.The OH that diffuses out
-, H
2O, H
+To influence the stability of device Deng material, and make the threshold voltage (Vth) of film transistor device that bigger drift take place, cause product failure.And after having made gate insulation layer, increase by a step annealing technology, and can stop the diffusion of the group of hydrogen, avoid threshold voltage that bigger drift takes place, improved the yield of product.
Below enumerate a specific embodiment and be further explained in detail the array base palte that comprises the utility model thin-film transistor and the manufacture method of this array base palte, this embodiment adopts the technical scheme of the utility model optimum, only the array base palte with bottom grating structure is representative, is representative with oxide semiconductor as active layer only.Form the array base palte of bottom gate type as shown in Figure 1, Fig. 1, Fig. 3 and Fig. 4 be present embodiment array base-plate structure schematic diagram, gate electrode structure schematic diagram and source/drain electrode structural representation respectively, please refer to Fig. 1, Fig. 3 and shown in Figure 4, the manufacture method of present embodiment array base palte may further comprise the steps:
Step 2, after above-mentioned first grid protective layer 21 forms; on first grid protective layer 21, form the second grid protective layer 22; the material of the main employing of the second grid protective layer is the alloy material of Mo, Ti, Si codope; wherein the Ti element can be replaced by W, Zr, Nb, Cu, V, Ta, Ni, Cr, Hf, Rh, Co, Pd, Pt, Al, Mn, can also adopt other metals identical or close with the material behavior of above-mentioned each material.
Step 4, after gate electrode metal layer 23 is finished; form the 3rd grid protective layer 24 thereon; its material is the alloy material of Mo, Al, three kinds of metals of Nb; wherein; Al can be by material substitutions such as W, Zr, V, Ta, Ni, Cr, Co, Pd, Pt, Hf, Rh, Mn, Ti, Si, and the Nb in the alloy-layer also can be replaced by materials such as W, Zr, V, Ta, Ni, Cr, Co, Pd, Pt, Hf, Rh, Mn, Ti, Si simultaneously.Above-mentioned two kinds of metallic elements can also adopt other metals identical or close with its material behavior simultaneously.
Step 5, after above-mentioned the 3rd grid protective layer 24 forms, form the 4th grid protective layer 25, its material is MoSiN
x, Si element wherein can be replaced by materials such as N, Al, Cu, W, Zr, Hf, Rh, V, Ta, Ni, Cr, Co, Pd, Pt, Mn, Ti, and N element wherein can be by element and the identical or close element replacements of material behavior thereof such as Cl, P.
Step 6, first grid protective layer 21, the second grid protective layer 22, gate electrode metal layer 23, the 3rd grid protective layer 24 and the 4th grid protective layer 25 have been formed gate electrode layer; gate electrode layer is carried out graphical technology; be specially the etch process that adopts wet method, dry method or wet method dry method to combine and finish graphical to gate electrode layer, form gate electrode 2.
Step 9, finish later substrate in above-mentioned technology and form oxide active layer 4, active layer is to use metal-oxide semiconductor (MOS), as indium gallium zinc oxide (IGZO), indium gallium tin-oxide (ITZO), indium-zinc oxide (IZO), zinc tin oxide (TZO) and kin metal-oxide semiconductor (MOS) thereof.After the annealing process that the oxide active layer is carried out selecting, it is carried out graphical technology, the etch process that adopts wet method, dry method or wet method dry method to combine is finished above-mentioned active layer oxide semiconductor is carried out graphically.Annealing and process of surface treatment can be chosen in graphically and carry out.
Step 10, oxide active layer 4 is being carried out graphical and treatment process forms etching barrier layer 5 later on thereon, the material of etching barrier layer can adopt silica membrane, aluminum oxide film, thin film of titanium oxide, silicon oxynitride film, zirconia film, tantalum oxide film, barium titanate film, neodymia film, silicon oxynitride film, aluminum oxynitride film, nitrogen zirconia film, nitrogen tantalum oxide film and nitrogen neodymia film, the film that can also adopt other inorganic insulating materials identical or close with the material behavior of above-mentioned each material to form.
Step 11, etching barrier layer 5 is handled and technology graphical after; form second source/leakage protective layer 62 thereon; its material can be the alloy material of Mo, Ti, Si codope; wherein the Ti element can be substituted by W, Zr, Nb, Cu, V, Ta, Ni, Cr, Hf, Rh, Co, Pd, Pt, Al, Mn, can also adopt other metals identical or close with the material behavior of above-mentioned each material.
Step 12, after second source/leakage protective layer 62 is finished, form source/drain electrode metal level 63 thereon, its material is copper or its alloy.
Step 13, after source/drain electrode metal level 63 forms; form the 3rd source/leakage protective layer 64 thereon; its material is the alloy material of Mo, Al, three kinds of metals of Nb; wherein materials A l can be by material substitutions such as W, Zr, V, Ta, Ni, Cr, Co, Pd, Pt, Hf, Rh, Mn, Ti, Si, and the Nb in the alloy-layer can be replaced by materials such as W, Zr, V, Ta, Ni, Cr, Co, Pd, Pt, Hf, Rh, Mn, Ti, Si simultaneously.Above-mentioned two kinds of metallic elements can also adopt other metals identical or close with its material behavior simultaneously.
Step 14, after above-mentioned the 3rd source/leakage protective layer 64 forms, form the 4th source/leakage protective layer 65 thereon, its material is MoSiN
x, wherein the Si element can be replaced by materials such as N, Al, Cu, W, Zr, Hf, Rh, V, Ta, Ni, Cr, Co, Pd, Pt, Mn, Ti.Wherein the N element can be replaced by elements such as Cl, P and the identical or close element of material behavior thereof.
Step 15, after above-mentioned each layer process forms, it is carried out graphical technology, after finishing, above-mentioned technology forms passivation layer 7 thereon, and it is carried out graphical technology and make via hole, the material of passivation layer can adopt silica membrane, aluminum oxide film, titanium oxide, silicon oxynitride film, zirconia film, the tantalum oxide film, barium titanate film, the neodymia film, silicon oxynitride film, the aluminum oxynitride film, the nitrogen zirconia film, the nitrogen tantalum oxide film, nitrogen neodymia film, silicon nitride film, aluminium nitride film, outside zr-n film or the tantalum nitride membrane, the film that can also adopt other inorganic insulating materials identical or close with the material behavior of above-mentioned each material to form.Simultaneously the gate insulation layer in the utility model can be above-mentioned insulation a kind of in the semiconductor layer by layer, the laminated construction of two kinds or three kinds films, and it makes up also within protection range of the present utility model.The Combinatorial Optimization of passivation layer also can combine to realize with the organic insulation layer material.Common employing resin system material or the acrylic based material of organic material.
Step 16, after above-mentioned technology is finished, form pixel electrode 8 thereon, and it is carried out graphical technology.
In the utility model embodiment, solve the bad problem of yield when the oxide tft array adopts copper or its alloy as electrode by the gate electrode of multi-level optimization and the protective layer of source/drain electrode.Can effectively improve the yield of product by using method of the present utility model, and reach the beneficial effect that reduces cost, improves production capacity.
Obviously, those skilled in the art can carry out various changes and modification and not break away from this bright spirit and scope the utility model.Like this, if of the present utility model these are revised and modification belongs within the scope of the utility model claim and equivalent technologies thereof, then the utility model also is intended to comprise these changes and modification interior.
Claims (13)
1. a thin-film transistor is characterized in that, described thin-film transistor comprises gate electrode, active layer and source/drain electrode, and the gate insulation layer between described gate electrode and active layer, wherein:
Described gate electrode comprises gate electrode metal layer and first group of protective layer, and described first group of protective layer isolated described active layer and described gate electrode metal layer between gate electrode metal layer and gate insulation layer;
The material of described gate electrode metal layer is copper or copper alloy.
2. thin-film transistor as claimed in claim 1 is characterized in that, described gate electrode also comprises second group of protective layer, is positioned at the side that the gate electrode metal layer deviates from first group of protective layer;
Described second group of protective layer comprises first grid protective layer and the second grid protective layer, and the described second grid protective layer is between first grid protective layer and gate electrode metal layer.
3. thin-film transistor as claimed in claim 2 is characterized in that, the material of described first grid protective layer is silicon nitride or titanium nitride; And/or
The material of the described second grid protective layer is molybdenum titanium alloy; molybdenum and tungsten alloy; the molybdenum zircaloy; the molybdenum niobium alloy; molybdenum-copper; the molybdenum vanadium alloy; the molybdenum tantalum alloy; Mo-Ni alloy; the molybdenum evanohm; the molybdenum hafnium alloy; the molybdenum rhodium alloy; the molybdenum cobalt alloy; the molybdenum palldium alloy; the molybdenum platinum alloy; the molybdenum aluminium alloy; molybdenum manganese alloy; titanium silicide; tungsten silicide; zirconium silicide; niobium silicide; copper silicide; vanadium silicide; tantalum silicide; nickle silicide; chromium silicide; hafnium suicide; the silication rhodium; cobalt silicide; palladium silicide; platinum silicide; silicated aluminum or silication manganese.
4. as claim 1,2 or 3 described thin-film transistors, it is characterized in that described first group of protective layer comprises the 3rd grid protective layer and the 4th grid protective layer, described the 3rd grid protective layer is between gate electrode metal layer and the 4th grid protective layer.
5. thin-film transistor as claimed in claim 4, it is characterized in that the material of described the 3rd grid protective layer is molybdenum aluminium niobium alloy, molybdenum and tungsten alloy, molybdenum zircaloy, molybdenum vanadium alloy, molybdenum tantalum alloy, Mo-Ni alloy, molybdenum evanohm, molybdenum cobalt alloy, molybdenum palldium alloy, molybdenum platinum alloy, molybdenum hafnium alloy, molybdenum rhodium alloy, molybdenum manganese alloy, molybdenum silicide or molybdenum titanium alloy; And/or
The material of described the 4th grid protective layer is molybdenum nitride; the nitrogen molybdenum silicide; the aluminium nitride molybdenum; the copper nitride molybdenum; the nitrogenize tungsten; the zirconium nitride molybdenum; the hafnium nitride molybdenum; the rhodium nitrate molybdenum; the vanadium nitride molybdenum; the tantalum nitride molybdenum; the nickel oxide molybdenum; the nitrogenize chrome molybdenum; the cobalt nitride molybdenum; nitrogenize palladium molybdenum; the platinum nitride molybdenum; the nitrogenized manganese molybdenum; the titanium nitride molybdenum; the chlorine molybdenum silicide; the aluminium chloride molybdenum; the copper chloride molybdenum; the chlorination tungsten; the zirconium chloride molybdenum; the hafnium chloride molybdenum; the radium chloride molybdenum; the vanadium chloride molybdenum; the tantalic chloride molybdenum; the nickel chloride molybdenum; the chlorination chrome molybdenum; the cobalt chloride molybdenum; the palladium bichloride molybdenum; the platinum chloride molybdenum; the manganese chloride molybdenum; the titanium chloride molybdenum; the phosphorus molybdenum silicide; the aluminum phosphate molybdenum; the phosphorized copper molybdenum; the phosphatization tungsten; the zirconium phosphide molybdenum; phosphatization hafnium molybdenum; phosphatization rhodium molybdenum; phosphatization vanadium molybdenum; phosphatization tantalum molybdenum; the nickel phosphide molybdenum; the phosphatization chrome molybdenum; phosphatization cobalt molybdenum; phosphatization palladium molybdenum; phosphatization platinum molybdenum; phosphatization manganese molybdenum or phosphatization titanium molybdenum.
6. thin-film transistor as claimed in claim 1, it is characterized in that, source/the drain electrode of described thin-film transistor comprises source/drain electrode metal level and second source/leakage protective layer, described second source/leakage protective layer is isolated source/drain electrode metal level and active layer between source/drain electrode metal level and active layer;
The material of described source/drain electrode metal level is copper or copper alloy.
7. thin-film transistor as claimed in claim 6; it is characterized in that the material of described second source/leakage protective layer is molybdenum titanium alloy; molybdenum and tungsten alloy; the molybdenum zircaloy; the molybdenum niobium alloy; molybdenum-copper; the molybdenum vanadium alloy; the molybdenum tantalum alloy; Mo-Ni alloy; the molybdenum evanohm; the molybdenum hafnium alloy; the molybdenum rhodium alloy; the molybdenum cobalt alloy; the molybdenum palldium alloy; the molybdenum platinum alloy; the molybdenum aluminium alloy; molybdenum manganese alloy; titanium silicide; tungsten silicide; zirconium silicide; niobium silicide; copper silicide; vanadium silicide; tantalum silicide; nickle silicide; chromium silicide; hafnium suicide; the silication rhodium; cobalt silicide; palladium silicide; platinum silicide; silicated aluminum or silication manganese.
8. thin-film transistor as claimed in claim 6 is characterized in that, described source/drain electrode also comprises the 3rd group of protective layer, is positioned at the side that source/drain electrode metal level deviates from second source/leakage protective layer;
Described the 3rd group of protective layer comprises the 3rd source/leakage protective layer and the 4th source/leakage protective layer, and described the 3rd source/leakage protective layer is between source/drain electrode metal level and the 4th source/leakage protective layer.
9. thin-film transistor as claimed in claim 8, it is characterized in that the material of described the 3rd source/leakage protective layer is molybdenum aluminium niobium alloy, molybdenum and tungsten alloy, molybdenum zircaloy, molybdenum vanadium alloy, molybdenum tantalum alloy, Mo-Ni alloy, molybdenum evanohm, molybdenum cobalt alloy, molybdenum palldium alloy, molybdenum platinum alloy, molybdenum hafnium alloy, molybdenum rhodium alloy, molybdenum manganese alloy, molybdenum silicide or molybdenum titanium alloy; And/or
The material of described the 4th source/leakage protective layer is molybdenum nitride; the nitrogen molybdenum silicide; the aluminium nitride molybdenum; the copper nitride molybdenum; the nitrogenize tungsten; the zirconium nitride molybdenum; the hafnium nitride molybdenum; the rhodium nitrate molybdenum; the vanadium nitride molybdenum; the tantalum nitride molybdenum; the nickel oxide molybdenum; the nitrogenize chrome molybdenum; the cobalt nitride molybdenum; nitrogenize palladium molybdenum; the platinum nitride molybdenum; the nitrogenized manganese molybdenum; the titanium nitride molybdenum; the chlorine molybdenum silicide; the aluminium chloride molybdenum; the copper chloride molybdenum; the chlorination tungsten; the zirconium chloride molybdenum; the hafnium chloride molybdenum; the radium chloride molybdenum; the vanadium chloride molybdenum; the tantalic chloride molybdenum; the nickel chloride molybdenum; the chlorination chrome molybdenum; the cobalt chloride molybdenum; the palladium bichloride molybdenum; the platinum chloride molybdenum; the manganese chloride molybdenum; the titanium chloride molybdenum; the phosphorus molybdenum silicide; the aluminum phosphate molybdenum; the phosphorized copper molybdenum; the phosphatization tungsten; the zirconium phosphide molybdenum; phosphatization hafnium molybdenum; phosphatization rhodium molybdenum; phosphatization vanadium molybdenum; phosphatization tantalum molybdenum; the nickel phosphide molybdenum; the phosphatization chrome molybdenum; phosphatization cobalt molybdenum; phosphatization palladium molybdenum; phosphatization platinum molybdenum; phosphatization manganese molybdenum or phosphatization titanium molybdenum.
10. as each described thin-film transistor in claim 1～3 and 5～9, it is characterized in that described thin-film transistor is bottom gate thin film transistor or top gate type thin film transistor.
11. thin-film transistor as claimed in claim 10 is characterized in that, the material of described active layer is metal-oxide semiconductor (MOS), crystal silicon or amorphous silicon.
12. an array base palte is characterized in that, comprises as each described thin-film transistor in the claim 1～11.
13. a display unit is characterized in that, comprises array base palte as claimed in claim 12.
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|---|---|---|---|
| CN 201320178233 CN203179898U (en) | 2013-04-10 | 2013-04-10 | Film transistor, array substrate and display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320178233 CN203179898U (en) | 2013-04-10 | 2013-04-10 | Film transistor, array substrate and display device |
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2013
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Granted publication date: 20130904 |