WO2018149142A1 - 薄膜晶体管及其制备方法、阵列基板、显示面板 - Google Patents
薄膜晶体管及其制备方法、阵列基板、显示面板 Download PDFInfo
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- WO2018149142A1 WO2018149142A1 PCT/CN2017/103911 CN2017103911W WO2018149142A1 WO 2018149142 A1 WO2018149142 A1 WO 2018149142A1 CN 2017103911 W CN2017103911 W CN 2017103911W WO 2018149142 A1 WO2018149142 A1 WO 2018149142A1
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- substrate
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- light blocking
- film transistor
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- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
- H01L27/1222—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs with a particular composition, shape or crystalline structure of the active layer
- H01L27/1225—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs with a particular composition, shape or crystalline structure of the active layer with semiconductor materials not belonging to the group IV of the periodic table, e.g. InGaZnO
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/0203—Particular design considerations for integrated circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66075—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
- H01L29/66227—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched, e.g. three-terminal devices
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- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
- H01L29/78606—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
- H01L29/78606—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device
- H01L29/78633—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device with a light shield
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
- H01L29/7869—Thin film transistors, i.e. transistors with a channel being at least partly a thin film having a semiconductor body comprising an oxide semiconductor material, e.g. zinc oxide, copper aluminium oxide, cadmium stannate
Definitions
- At least one embodiment of the present disclosure is directed to a thin film transistor and a method of fabricating the same, an array substrate, and a display panel.
- a thin film transistor is used as a driving element of a display panel.
- the active layer in the thin film transistor is irradiated with light, photo-generated carriers are generated, which causes an increase in leakage current of the thin film transistor, thereby affecting the quality of the display screen of the display panel, for example, crosstalk, afterimage, and the like.
- At least one embodiment of the present disclosure provides a thin film transistor including: a substrate substrate; and a gate electrode, a gate insulating layer, an active layer, and a source/drain electrode layer disposed on the substrate, the source and drain electrodes
- the layer includes a source electrode and a drain electrode, wherein the thin film transistor further includes a light blocking layer disposed around the active layer.
- the light blocking layer and the source/drain electrode layer may be disposed in the same layer and the same material; or the light blocking layer and the active layer may be in the same layer. And the same material settings.
- the light blocking layer may be connected to one of the source electrode and the drain electrode, and one of the source electrode and the drain electrode Interspersed.
- the light blocking layer in a case where the light blocking layer is disposed in the same layer as the active layer, the light blocking layer is spaced apart from the active layer.
- the light blocking layer may include an insulating material.
- a distance from a surface of the light blocking layer away from the substrate substrate to the substrate substrate is greater than or equal to a distance from the lining of the active layer.
- a distance from a surface of the base substrate to the base substrate; and/or a distance from a surface of the light blocking layer adjacent to the base substrate to the base substrate is less than or equal to a proximity of the active layer The distance from the surface of the base substrate to the substrate substrate.
- an orthographic projection of the light blocking layer on the base substrate is located within an orthographic projection of the gate electrode on the substrate.
- an orthographic projection of the light blocking layer on the base substrate is outside an orthographic projection of the gate electrode on the base substrate.
- the light blocking layer may include a plurality of divided portions that are disposed apart from each other in a direction parallel to the base substrate. The active layer is blocked by the light blocking layer.
- At least one embodiment of the present disclosure provides an array substrate including any of the thin film transistors described above.
- the array substrate provided by at least one embodiment of the present disclosure may further include a plurality of gate lines and a plurality of data lines, wherein the plurality of gate lines and the plurality of data lines cross each other to define a plurality of sub-pixel regions.
- Each of the sub-pixel regions includes the thin film transistor and a pixel electrode, the gate electrode of the thin film transistor is electrically connected to a corresponding one of the gate lines, and the source electrode is electrically connected to a corresponding one of the data lines, and The drain electrode is electrically connected to the pixel electrode; and each of the sub-pixel regions includes a display region and a non-display region, and the light blocking layer is located in the non-display region of each of the sub-pixel regions.
- one end of the light blocking layer is connected to the data line, and the other end is spaced apart from the drain electrode.
- the light blocking layer may be disposed around the thin film transistor.
- At least one embodiment of the present disclosure provides a display panel including any of the above array substrates and a counter substrate disposed on the array substrate.
- a spacer may be disposed between the opposite substrate and the array substrate, and the spacer is perpendicular to the thin film transistor on the array substrate. Opposed in the direction of the array substrate, and the spacer may include a light shielding material.
- the light shielding material may include carbon black and/or black resin.
- At least one embodiment of the present disclosure provides a method of fabricating a thin film transistor, including: providing a base substrate; and forming a gate electrode, a gate insulating layer, an active layer, and a source/drain electrode layer on the base substrate, the source The drain electrode layer includes a source electrode and a drain electrode; wherein the method further includes forming a light blocking layer around the active layer.
- 1a is a top plan view of a sub-pixel region of an array substrate
- FIG. 1b is a schematic cross-sectional view of the thin film transistor in the sub-pixel region shown in FIG. 1a along the A-B direction;
- FIG. 2a is a top view of a thin film transistor according to an embodiment of the present disclosure
- FIG. 2b is a schematic cross-sectional view of the thin film transistor of FIG. 2a along the C-D direction;
- FIG. 2c is another schematic cross-sectional view of the thin film transistor of FIG. 2a along the C-D direction;
- 3(a) to 3(c) are schematic views of a light blocking layer in a thin film transistor according to an embodiment of the present disclosure
- FIG. 4 is another schematic diagram of a light blocking layer in a thin film transistor according to an embodiment of the present disclosure
- FIG. 5 is a top view of a sub-pixel region in an array substrate according to an embodiment of the present disclosure
- FIG. 6 is a schematic cross-sectional view of a display panel according to an embodiment of the present disclosure.
- FIG. 7 is a process diagram of a method of fabricating a thin film transistor according to an embodiment of the present disclosure.
- FIG. 1a is a top plan view of a sub-pixel region of an array substrate.
- the gate line 1 and the data line 2 cross each other to define a sub-pixel area
- the sub-pixel area includes a thin film transistor and a pixel electrode 200
- the thin film transistor is connected to the pixel electrode 200.
- FIG. 1b is a schematic cross-sectional view of the thin film transistor in the sub-pixel region shown in FIG. 1a along the A-B direction.
- the gate electrode 110 disposed under the active layer 130 may block light incident on the active layer 130 from below the active layer 130.
- a black matrix (not shown) may be disposed over the active layer 130 to block light incident on the active layer 130 from above the active layer 130.
- the gate insulating layer 120 and the passivation layer 160 are generally transparent materials, the side surface of the active layer 130 is still exposed to light (indicated by an arrow in FIG. 1b). Therefore, it is still impossible to prevent the light from being irradiated to the side surface of the active layer 130 in the thin film transistor shown in FIGS. 1a and 1b, and a large amount of photogenerated carriers are still generated in the active layer 130.
- At least one embodiment of the present disclosure provides a thin film transistor, a method of fabricating the same, an array substrate, and a display panel to solve the above problems.
- the thin film transistor includes a base substrate and a gate electrode, a gate insulating layer, an active layer, and a source/drain electrode layer disposed on the base substrate, the source/drain electrode layer including a source electrode and a drain electrode, wherein the thin film transistor further A light blocking layer disposed around the active layer is included.
- each direction is based on the substrate substrate in the thin film transistor.
- the "upper surface” is a surface away from the substrate
- the “lower surface” is a surface close to the substrate
- its “side surface” The surface is a surface sandwiched between the upper surface and the lower surface.
- the direction of "lateral” is parallel to the surface of the substrate substrate, and the directions of "above” and “below” It is perpendicular to the surface direction of the base substrate, and “above” is the side of the active layer away from the substrate, and “below” is the side of the active layer close to the substrate.
- FIG. 2a is a top view of a structure of a thin film transistor according to an embodiment of the present disclosure.
- the thin film transistor includes an active layer 130, a source/drain electrode layer 140, and a light blocking layer 150.
- the source/drain electrode layer 140 includes a source electrode 141 and a drain electrode 142 electrically connected to the active layer 130, respectively.
- the light blocking layer 150 is disposed around the active layer 130 to block light from being irradiated onto the side surface of the active layer 130.
- the thin film transistor may further include a structure of a base substrate, a gate electrode, a gate insulating layer, and the like; further, embodiments of the present disclosure do not limit the type of the thin film transistor, for example, the above implementation.
- the light blocking layer 150 in the example can be applied to a bottom gate type thin film transistor, a top gate type thin film transistor, or a double gate type thin film transistor, etc., as long as the light blocking layer can block light from entering the side of the active layer 130 of the thin film transistor. It can be on the surface.
- the light shielding layer 150 is disposed to block the light from being irradiated onto the side surface of the active layer 130.
- the light blocking layer 150 is disposed such that a part of the side surface of the active layer 130 is not irradiated with light; or the light blocking layer 150 It is set such that all side surfaces of the active layer 130 are not irradiated with light.
- the embodiment of the present disclosure does not limit the range in which the light blocking layer 150 can block the side surface of the light-irradiating active layer 130, as long as the arrangement of the light blocking layer 150 can reduce the irradiation of the active layer 130 by light.
- the light blocking layer 150 can block light from being irradiated onto the upper surface and/or the lower surface of the active layer 130 except that the blocking light is irradiated onto the side surface of the active layer 130.
- the manner in which the light blocking layer 150 is disposed is not limited.
- the light blocking layer 150 may be separately provided; for example, in other embodiments of the present disclosure, the light blocking layer 150 may be simultaneously prepared during the process of preparing the thin film transistor.
- different ways of setting the light blocking layer 150 will be described separately.
- the light blocking layer 150 may be disposed around the active layer 130 alone.
- the light blocking layer 150 may be formed of any material having a light blocking function.
- the light blocking layer 150 may be formed of an insulating material having a light blocking function, such as a black resin.
- the light blocking layer may be formed of a conductive material (for example, metal) or a semiconductor material having a light blocking function.
- the light blocking layer 150 and the active layer 130 are formed of the same material and disposed in the same layer, or the light blocking layer 150 and the source and drain electrode layer 140 are formed of the same material and are disposed in the same layer. .
- the active layer 130 and the light blocking layer 150 can be simultaneously formed by the same patterning process or the source/drain electrode layer 140 and the light blocking layer 150 can be simultaneously formed by the same patterning process.
- providing the light blocking layer 150 in the thin film transistor does not increase the manufacturing process steps of the thin film transistor, and the cost can be saved.
- the light blocking layer 150 is in the same layer as the active layer 130 and is of the same material.
- the light-blocking layer 150 prepared from the same material as the active layer 130 generates photo-generated carriers under the illumination of light, so it is necessary to space the light-blocking layer 150 from the active layer 130 to avoid the light-blocking layer 150.
- the photogenerated carriers generated in the movement move into the active layer 130.
- the thickness of the light blocking layer 150 and the thickness of the active layer 130 are the same, whereby the light blocking layer 150 and the active layer 130 can be easily formed simultaneously by one patterning process.
- the light blocking layer 150 is in the same layer and the same material as the active layer 130, and the thickness of the light blocking layer 150 is greater than the thickness of the active layer 130, so that not only can be blocked parallel to the lining.
- Light of the base substrate is irradiated to the side surface of the active layer 130 and light that is incident in the oblique direction with respect to the base substrate 100 can be blocked from being irradiated onto the side surface of the active layer 130 to further increase the shading of the active layer 130. effect.
- a semi-conductive film for forming the active layer 130 may be patterned using a two-tone mask (for example, a halftone mask or a gray tone mask) to simultaneously form the light blocking layer 150 and the active layer 130.
- the thickness of the light layer 150 is greater than the thickness of the active layer 130.
- a semiconductor thin film is formed on the base substrate 100; a photoresist is coated on the semiconductor thin film, and the photoresist is exposed and developed using a two-tone mask to obtain a completely retained portion of the photoresist, and the photoresist portion is retained.
- a portion and a photoresist completely removed portion a photoresist completely remaining portion corresponding to a region where the light blocking layer 150 is to be formed, a photoresist portion remaining region corresponding to a region where the active layer 130 is to be formed, and a photoresist completely removed region corresponding to In other regions; performing a first etching to remove a portion of the semiconductor film from which the photoresist is completely removed; performing an ashing process to remove the photoresist remaining in the photoresist portion and leaving the photoresist completely retained by the portion of the photoresist The encapsulation is thinned; a second etching is performed to remove a portion of the semiconductor film remaining in the photoresist portion to obtain the active layer 130; and the photoresist remaining in the photoresist is removed to obtain the light blocking layer 150.
- the light blocking layer 150 is in the same layer as the source and drain electrode layer 140 and is of the same material.
- the source/drain electrode layer 140 and the light blocking layer 150 may be formed of metal.
- the thickness of the light blocking layer 150 is the same as the thickness of the active layer 130.
- the thickness of the light blocking layer 150 is greater than the thickness of the active layer 130, so that not only the light parallel to the base substrate 100 is irradiated to the side surface of the active layer 130 but also the oblique direction with respect to the base substrate 100 can be blocked. The incident light is irradiated onto the side surface of the active layer 130 to further enhance the light shielding effect on the active layer 130.
- the thickness of the light blocking layer 150 and the active layer 130 can be made larger than that of the active layer 130.
- the light blocking layer 150 does not need to use a two-tone mask, so that the manufacturing process can be further simplified.
- the light blocking layer 150 in a case where the light blocking layer 150 is disposed in the same layer and the same material as the source/drain electrode layer 140, the light blocking layer 150 is spaced apart from at least one of the source electrode 141 and the drain electrode 142. .
- the light blocking layer 150 in the case where the light blocking layer 150 is disposed in the same layer and the same material as the source/drain electrode layer 140, the light blocking layer 150 cannot be connected to both the source electrode 141 and the drain electrode 142 to prevent the light blocking layer from being the source electrode and The drain electrode is connected.
- the light blocking layer 150 is spaced apart from one of the source electrode 141 and the drain electrode 142 included in the source/drain electrode layer 140 to be connected to the other; in this case, The light blocking layer 150 is connected to one of the source electrode 141 and the drain electrode 142, so the light blocking layer 150 may be integrally formed with one of the source electrode 141 and the drain electrode 142 to further simplify the fabrication process, and the light blocking layer 150 may be The connected source electrode 141 or drain electrode 142 cooperate to better block light from being incident on the active layer 130. For example, as shown in FIG. 2a, the light blocking layer 150 is connected or integrally formed with the source electrode 141, and is disconnected from the drain electrode 142.
- the light blocking layer 150 is disconnected from the drain electrode 142, so that there is a gap 170 between the light blocking layer 150 and the drain electrode 142, and light may be incident on the active layer 130 through the gap 170;
- the width of the gap 170 is made as small as possible, for example the width of the gap 170 can be on the order of a few microns.
- the thin film transistor may include a base substrate 100 and a gate electrode 110, a gate insulating layer 120, an active layer 130, and a source/drain electrode layer (on the 2b in FIG. 2b), which are sequentially disposed on the base substrate 100. ), the light blocking layer 150 and the passivation layer 160.
- FIG. 2c is another schematic cross-sectional view of the thin film transistor of FIG. 2a along the C-D direction.
- the distance of the surface of the light blocking layer 150 away from the substrate 100 to the substrate 100 is greater than or equal to the distance from the substrate 100 of the active layer 130 .
- the distance from the surface to the substrate 100; and/or the distance of the surface of the light blocking layer 150 from the substrate 100 to the substrate 100 is less than or equal to the surface of the active layer 130 close to the substrate 100 to the substrate The distance of the substrate 100. In this way, it is possible to block light from being irradiated onto the active layer 130 more effectively.
- the light blocking layer 150 is disposed to overlap with the gate electrode 110.
- an orthographic projection of the light blocking layer 150 on the substrate substrate 100 is located on the gate electrode 110.
- the height of the light blocking layer 150 is increased to block the irradiation of the active layer 130 from above the light blocking layer 150.
- the light blocking layer 150 is disposed not to overlap the gate electrode 110.
- the orthographic projection of the light blocking layer 150 on the substrate substrate 100 is outside the orthographic projection of the gate electrode 110 on the substrate substrate 100, so that the end of the light blocking layer 150 close to the substrate substrate 100 can be reduced to the lining.
- the distance of the base substrate 100 reduces the gap between the light blocking layer 150 and the base substrate 100, thereby further blocking the irradiation of the active layer 130 from below the light blocking layer 150.
- the pattern shape of the light blocking layer 150 can be of various types.
- the shape of the light blocking layer 150 parallel to the cross section of the base substrate 100 may include one or a combination of an elongated shape, an L shape, a circular arc shape, and the like.
- the embodiment of the present disclosure does not limit the pattern shape of the light blocking layer 150 as long as it can shield the side surface of the active layer 130 from light without affecting the performance of the thin film transistor.
- the cross-sectional shape of the light blocking layer 150 may be an elongated shape, an L shape, and a circular arc shape, respectively.
- the cross-sectional shape of the light-blocking layer 150 may be a combination of the above-mentioned various pattern types.
- the light-blocking layer 150 in the thin film transistor in FIG. 3( a ) is taken as an example, and the first portion 151 is taken as an example.
- the second portion 152 may be replaced by the elongated shape shown in FIG. 3(a) to the L shape shown in FIG. 3(b) or the circular arc shape shown in FIG. 3(c).
- the light blocking layer 150 may be connected end to end to form a seal. Closed patterns, such as the "mouth" shape.
- the light blocking layer 150 includes a plurality of sub-sections separated from each other, and the light blocking layer 150 including the plurality of sub-sections may block the active layer 130 in a direction parallel to the substrate.
- the plurality of sections may be arranged such that the active layer may be blocked by the light blocking layer 150 in all directions parallel to the substrate.
- the plurality of sections of the light blocking layer 150 do not overlap in a direction parallel to the base substrate 100. In this way, the footprint of the light blocking layer 150 can be reduced.
- the plurality of sections of the light blocking layer 150 are overlapped in a direction parallel to the base substrate 100 such that the active layer 130 is in all directions parallel to the base substrate 100. Blocked by the light blocking layer 150.
- FIG. 4 is another schematic diagram of a light blocking layer of a thin film transistor according to an embodiment of the present disclosure.
- the light blocking layer 150 includes a first portion 151 and a second portion 152 which are sequentially disposed in a direction parallel to the substrate 100 on one side of the active layer 130, and block the light.
- the layer 150 includes, on the other side of the active layer 130, a third portion 153 and a fourth portion 154 which are disposed in an overlapping manner in a direction parallel to the substrate 100, and the first portion 151, the second portion 152, and the third portion
- the sub-portion 153 and the fourth sub-portion 154 cooperate to block the active layer 130 from being blocked by the light-blocking layer 150 in all directions parallel to the base substrate 100, so that light can be more effectively prevented from being irradiated onto the active layer 130, In particular, it is more effective to prevent light from being irradiated onto the side surface of the active layer 130. For example, as shown in FIG.
- the first portion 151 of the light blocking layer 150 is connected to the source electrode 141 and disconnected from the drain electrode 142, and the second portion 152 of the light blocking layer 150 is disconnected from the source electrode 141 and is connected to the drain electrode.
- the first sub-section 151 and the second sub-section 152 are overlapped in a direction parallel to the base substrate 100; in this case, the first sub-section 151 may block between the second sub-section 151 and the source electrode 141
- the gap of the second portion 152 can block the gap between the first portion 151 and the drain electrode 142, such that the light blocking layer 150 can completely block the illumination of the side surface of the active layer 130 by light.
- Embodiments of the present disclosure provide an array substrate, which may include the thin film transistor of any of the above embodiments.
- the array substrate may further include a plurality of gate lines and a plurality of data lines, the plurality of gate lines and the plurality of data lines crossing each other to define a plurality of sub-pixel regions, each of the sub-pixel regions including the a thin film transistor and a pixel electrode, wherein a gate electrode of the thin film transistor is electrically connected to a corresponding gate line, a source electrode is electrically connected to a corresponding data line, and a drain electrode is electrically connected to the pixel electrode; and each sub-pixel region includes a display area and a non-display Area, light barrier is located in each A non-display area of a sub-pixel area.
- the gate lines, the data lines, and the thin film transistors may all be located in the non-display area of the sub-pixel area, and the pixel electrodes may be located in the display area of the sub-pixel area.
- FIG. 5 is a schematic structural diagram of a sub-pixel region in an array substrate according to an embodiment of the present disclosure, which is a partial schematic diagram of a sub-pixel region.
- the sub-pixel region of the array substrate includes gate lines 1 and data lines 2, pixel electrodes 200, and thin film transistors (including the active layer 130, The source/drain electrode layer 140) and the light blocking layer 150 include a source electrode 141 and a drain electrode 142.
- the source electrode 141 is electrically connected to the data line 2, and the gate electrode of the thin film transistor (not shown in FIG. 5)
- the gate line 1 is electrically connected
- the drain electrode 142 is electrically connected to the pixel electrode 200
- the thin film transistor functions as a switching element to control the switching of the pixel electrode 200.
- each sub-pixel region of the array substrate includes a display region and a non-display region
- the pixel electrode 200 is disposed in the display region
- the thin film transistor and the light blocking layer 150 are disposed in the non-display region.
- the light blocking layer 150 may be disposed around the active layer 130 as in the above embodiment regarding the thin film transistor; in this case, the light blocking layer 150 may be disposed to be parallel to Only the side surface of the active layer 130 is blocked in the direction of the base substrate 100 without blocking the side surfaces of the source electrode 141, the drain electrode 142, and/or the gate electrode 110, in other words, the light blocking layer 150 may be disposed to surround only the active layer. 130 does not surround the source electrode 141, the drain electrode 142, and/or the gate electrode 110.
- the light blocking layer 150 is disposed around the thin film transistor; in this case, the light blocking layer 150 may be disposed to block the active layer 130, the source electrode 141, the drain electrode 142, and the gate in a direction parallel to the base substrate 100.
- the side surface of the electrode 110 in other words, the light blocking layer 150 may be disposed to surround the source layer 130, the source electrode 141, the drain electrode 142, and the gate electrode 110.
- the dotted line region T indicates the region where the thin film transistor is located, and the light blocking layer 150 may be disposed around the region T to shield the side surface of the entire thin film transistor from light.
- the fifth portion 155 and the sixth portion 156 of the light blocking layer 150 as shown in FIG. 5 are located around the thin film transistor to block the side surface of the thin film transistor, so that the active layer 130 in the thin film transistor can also be blocked. The side surface is protected from light.
- the thin film crystal is disposed.
- the pattern type of the light blocking layer 150 around the tube reference may be made to the pattern type of the light blocking layer in the foregoing embodiment (the embodiment of the present disclosure regarding the thin film transistor), which will not be described herein.
- one end of the light blocking layer 150 may be connected to the data line, and the other end may be spaced apart from the drain electrode.
- the fifth sub-section 155 of the light-blocking layer 150 is taken as an example; one end of the fifth sub-section 155 is connected to the data line 2, and the other end of the fifth sub-section 155 is connected to the thin film transistor.
- the drain electrodes 142 are spaced apart, so that the drain electrode 142 and the data line can be avoided while improving the light blocking effect of the light blocking layer 150 (the gap between the end of the fifth portion 155 connected to the data line 2 and the data line 2). 2 connected.
- At least one embodiment of the present disclosure provides a display panel including the array substrate provided by any of the above embodiments.
- the display panel provided by at least one embodiment of the present disclosure may further include an opposite substrate disposed on the array substrate.
- the display panel may be a liquid crystal display panel, for example, the array substrate and the opposite substrate of the liquid crystal display panel are opposed to each other to form a liquid crystal cell filled with a liquid crystal material.
- the counter substrate may be, for example, a color filter substrate.
- the electric field formed between the pixel electrode and the common electrode of the array substrate controls the degree of rotation of the liquid crystal material to perform image display.
- the common electrode may be disposed on the array substrate or the opposite substrate.
- the display panel may be an organic light emitting diode (OLED) display panel, wherein an organic light emitting material may be formed in a sub-pixel region of the display panel, and the pixel electrode is used as an anode or a cathode for driving The organic luminescent material emits light for image display.
- OLED organic light emitting diode
- the display device may be an electronic paper display panel, wherein an electronic ink layer may be formed on the array substrate of the display panel, and the pixel electrode is used to apply the charged micro in the driving electronic ink. The voltage at which the particles move to display the image.
- the upper side of the active layer 130 of the thin film transistor may still be affected by the illumination.
- a spacer may be disposed between the opposite substrate and the array substrate, and the spacer and the thin film transistor on the array substrate are oppositely disposed in a direction perpendicular to the array substrate.
- the spacer may include a light shielding material.
- the spacer may be disposed to cover the entire area of the thin film transistor, or may be disposed to cover at least the active layer 130 in the thin film transistor, such that the spacer may block the light that illuminates the active layer 130 of the thin film transistor from above. .
- FIG. 6 is a schematic cross-sectional structural view of a display panel according to an embodiment of the present disclosure
- the display panel is, for example, a liquid crystal display panel.
- a liquid crystal layer 500 is disposed between the array substrate and the opposite substrate 300 disposed in the cartridge to form a liquid crystal cell
- the spacer 400 is disposed between the array substrate and the opposite substrate 300, and the spacer 400
- the light shielding material is disposed overlapping the thin film transistor, and thus the spacer 400 can block light that illuminates the active layer 130 from above the active layer 130 of the thin film transistor.
- the material for preparing the spacer is not limited.
- the spacer includes a light shielding material, and the light shielding material may be a material that can block light such as carbon black and/or black resin.
- a common electrode may be disposed on the opposite substrate 300, and an electric field that drives the rotation of the liquid crystal layer 500 may be formed between the common electrode and the pixel electrode 200.
- At least one embodiment of the present disclosure provides a method of fabricating a thin film transistor, the method comprising: providing a substrate; forming a gate electrode, a gate insulating layer, an active layer, and a source/drain electrode layer on the substrate, the source and drain electrodes
- the layer includes a source electrode and a drain electrode; a light blocking layer is formed around the active layer.
- FIG. 7 is a process diagram of a method of fabricating a thin film transistor according to an embodiment of the present disclosure.
- a method of fabricating a thin film transistor may include the following process.
- S1 providing a base substrate, and depositing a gate metal film on the base substrate, and forming a gate electrode by patterning the gate metal film.
- the base substrate may be a glass substrate or the like.
- the material of the gate electrode may be a copper-based metal, for example, copper (Cu), copper-molybdenum alloy (Cu/Mo), copper-titanium alloy (Cu/Ti), copper-molybdenum-titanium alloy (Cu/ Mo/Ti), copper-molybdenum-tungsten alloy (Cu/Mo/W), copper-molybdenum-niobium alloy (Cu/Mo/Nb), etc.; the material of the gate electrode may also be a chromium-based metal, for example, a chromium-molybdenum alloy (Cr/ Mo), chrome-titanium alloy (Cr/Ti), chrome-molybdenum-titanium alloy (Cr/Mo/Ti), etc.; the material of the gate electrode may also be aluminum or aluminum alloy.
- Cu copper
- Cu/Mo copper-molybdenum alloy
- Cu/Ti copper-titanium alloy
- Cu/ Mo/Ti copper-molybden
- the patterning process may be, for example, a photolithography patterning process, which may include, for example, coating a photoresist layer on a structural layer that needs to be patterned, and exposing the photoresist layer using a mask.
- the exposed photoresist layer is developed to obtain a photoresist pattern, the structural layer is etched using the photoresist pattern as a mask, and then the photoresist pattern is optionally removed.
- the material of the gate insulating layer may include silicon nitride (SiNx), silicon oxide (SiOx), aluminum oxide (Al 2 O 3 ), aluminum nitride (AlN), or other suitable materials.
- S3 depositing a semiconductor thin film on the gate insulating layer and patterning it to form an active layer.
- the light blocking layer may be formed in the same layer as the active layer and formed of the same material.
- a patterning process is performed to simultaneously form an active layer and a light blocking layer.
- a light blocking layer is formed around the active layer to prevent the side surface of the active layer from being irradiated with light.
- the material of the active layer may include amorphous silicon, polycrystalline silicon, and metals such as indium gallium zinc oxide (IGZO), indium zinc oxide (IZO), zinc oxide (ZnO), gallium zinc oxide (GZO), and the like. Oxide, etc.
- S4 depositing a source/drain metal layer on the underlying substrate on which the active layer is formed and patterning the same to form a source/drain electrode layer, which may include a source electrode and a drain electrode.
- the light blocking layer may be formed in the same layer and the same material as the source and drain electrode layers.
- a source/drain metal layer is deposited on a base substrate and then patterned to simultaneously form a source/drain electrode layer and a light blocking layer.
- a light blocking layer is formed around the active layer to prevent the side surface of the active layer from being irradiated with light.
- the source-drain electrode layer may include a metal material, which may be formed in a single layer or a multilayer structure, for example, formed as a single-layer aluminum structure, a single-layer molybdenum structure, or a layer of aluminum sandwiched between two layers of molybdenum. structure.
- the formation of the light blocking layer is not limited to the preparation method provided in the above examples, and may be formed separately.
- a light blocking layer is separately formed around the active layer, for example, by depositing a thin film and a patterning process to prevent the side surface of the active layer from being irradiated with light; the type of pattern of the formed light blocking layer can be referred to the foregoing embodiment, Do not repeat them.
- the material of the passivation layer may be silicon nitride (SiNx), silicon oxide (SiOx), an acrylic resin, or the like.
- Embodiments of the present disclosure provide a thin film transistor and a method of fabricating the same, an array substrate, a display panel, and may have at least one of the following beneficial effects:
- the light blocking layer can prevent the side surface of the active layer from being irradiated with light, thereby reducing or eliminating In addition to problems such as poor display due to photo-generated carriers generated by light irradiation of the active layer.
- the spacer includes a light shielding material and is disposed to overlap the thin film transistor so that the active layer can be shielded from above the active layer.
- the light blocking layer can be formed simultaneously in the process of preparing the active layer or the source/drain electrodes of the thin film transistor without increasing the preparation process steps.
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Abstract
Description
Claims (17)
- 一种薄膜晶体管,包括:衬底基板;以及设置于所述衬底基板上的栅电极、栅绝缘层、有源层、和源漏电极层,所述源漏电极层包括源电极和漏电极,其中,所述薄膜晶体管还包括设置在所述有源层周围的挡光层。
- 根据权利要求1所述的薄膜晶体管,其中,所述挡光层与所述源漏电极层同层且同材料设置;或者所述挡光层与所述有源层同层且同材料设置。
- 根据权利要求1或2所述的薄膜晶体管,其中,所述挡光层与所述源电极和所述漏电极中的一个连接,且与所述源电极和所述漏电极中的一个间隔开。
- 根据权利要求1或2所述的薄膜晶体管,其中,在所述挡光层与所述有源层同层设置的情形下,所述挡光层与所述有源层间隔开。
- 根据权利要求1所述的薄膜晶体管,其中,所述挡光层包括绝缘材料。
- 根据权利要求1-5任一所述的薄膜晶体管,其中,所述挡光层的远离所述衬底基板的表面至所述衬底基板的距离大于或等于所述有源层的远离所述衬底基板的表面至所述衬底基板的距离;和/或所述挡光层的靠近所述衬底基板的表面至所述衬底基板的距离小于或等于所述有源层的靠近所述衬底基板的表面至所述衬底基板的距离。
- 根据权利要求6所述的薄膜晶体管,其中,所述挡光层在所述衬底基板上的正投影位于所述栅电极在所述衬底基板上的正投影之内。
- 根据权利要求6所述的薄膜晶体管,其中,所述挡光层在所述衬底基板上的正投影位于所述栅电极在所述衬底基板上的正投影之外。
- 根据权利要求1-8任一项所述的薄膜晶体管,其中,所述挡光层包括多个彼此分离的分部,该多个分部设置为在平行于所述衬底基板的方向 上所述有源层被所述挡光层遮挡。
- 一种阵列基板,包括权利要求1-9任一所述的薄膜晶体管。
- 根据权利要求10所述的阵列基板,还包括多条栅线和多条数据线,其中,所述多条栅线和所述多条数据线彼此交叉以限定多个子像素区域,每个所述子像素区域包括所述薄膜晶体管和像素电极,所述薄膜晶体管的所述栅电极与对应的所述栅线电连接,所述源电极与对应的所述数据线电连接,且所述漏电极与所述像素电极电连接;并且每个所述子像素区域包括显示区域和非显示区域,所述挡光层位于每个所述子像素区域的所述非显示区域。
- 根据权利要求11所述的阵列基板,其中,所述挡光层的一端与所述数据线连接,另一端与所述漏电极间隔开。
- 根据权利要求10-12任一所述的阵列基板,其中,所述挡光层设置在所述薄膜晶体管周围。
- 一种显示面板,包括权利要求10-13任一所述的阵列基板和与所述阵列基板对盒设置的对置基板。
- 根据权利要求14所述的显示面板,其中,所述对置基板和所述阵列基板之间设置有隔垫物,所述隔垫物与所述阵列基板上的薄膜晶体管在垂直于所述阵列基板的方向上相对设置,并且所述隔垫物包括遮光材料。
- 根据权利要求15所述的显示面板,其中,所述遮光材料包括炭黑和/或黑色树脂。
- 一种薄膜晶体管的制备方法,包括:提供衬底基板;以及在所述衬底基板上形成栅电极、栅绝缘层、有源层和源漏电极层,所述源漏电极层包括源电极和漏电极,其中所述方法还包括在所述有源层周围形成挡光层。
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US16/827,151 US11233070B2 (en) | 2017-02-17 | 2020-03-23 | Thin film transistor and manufacturing method thereof, array substrate and display panel |
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US16/827,151 Continuation US11233070B2 (en) | 2017-02-17 | 2020-03-23 | Thin film transistor and manufacturing method thereof, array substrate and display panel |
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WO2020166320A1 (ja) * | 2019-02-14 | 2020-08-20 | 株式会社ジャパンディスプレイ | 表示装置 |
JP2020160253A (ja) * | 2019-03-26 | 2020-10-01 | 株式会社ジャパンディスプレイ | 表示装置 |
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CN106876386B (zh) | 2017-02-17 | 2019-12-20 | 京东方科技集团股份有限公司 | 薄膜晶体管及其制备方法、阵列基板、显示面板 |
JP2018180087A (ja) * | 2017-04-05 | 2018-11-15 | 株式会社ジャパンディスプレイ | 表示装置 |
CN108807549B (zh) | 2018-06-01 | 2021-03-23 | 京东方科技集团股份有限公司 | 薄膜晶体管及其制造方法、阵列基板及其制造方法 |
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US11233070B2 (en) | 2022-01-25 |
US20200219901A1 (en) | 2020-07-09 |
US10636816B2 (en) | 2020-04-28 |
CN106876386A (zh) | 2017-06-20 |
US20190074302A1 (en) | 2019-03-07 |
CN106876386B (zh) | 2019-12-20 |
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