CN1718848A - Method and system of preparing ITO film using medium frequency reaction magnetic controlled sputtering indium tin alloy target - Google Patents
Method and system of preparing ITO film using medium frequency reaction magnetic controlled sputtering indium tin alloy target Download PDFInfo
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Abstract
A process for preparing ITO film by magnetically controlled MF sputtering to InSn alloy target includes such steps as arranging InSn alloy target and the substrate to be plated in vacuum chamber, connecting said target to MF power supply, introducing working gas and reacting gas to the vacuum chamber for generating a plasma region between target and substrate and sputtering the target to release InSn particles, detecting the particular spectrum intensity of In at 451 nm, filtering, intensifying and amplifying it, comparing it with that of working gas, and regulating the flow of reacting gas according to the comparison result for oxidizing reaction of InSn particles and depositing them on substrate.
Description
Technical field
The present invention relates to vacuum coating technology, be specifically related to a kind of method and system of the ITO of preparation film.
Background technology
ITO (indium tin oxide) film has good electroconductibility and transmission of visible light, is a kind of important nesa coating, has obtained widespread use in photoelectric device.Preparation ITO (indium tin oxide) film has several different methods.It is at present general that what adopt is direct current magnetron sputtering process, employing be high agglomerating ITO (indium tin oxide) ceramic target of price comparison mostly, the phenomenon that poisons of target appears through regular meeting aborning, the chemical ingredients of film also is inconvenient to adjust.Also useful in addition radio-frequency sputtering, but radio-frequency sputtering is to the equipment requirements strictness, and cost is higher.
Usually, reactive sputtering is not when controlling, the dividing potential drop of reactant gases oxygen can not be regulated timely, and the insufficient or composition of excess reaction gas oxygen all can have influence on the moiety of ITO, and this has just brought difficulty to stable high-quality ITO (indium tin oxide) film of processability.
Summary of the invention
The objective of the invention is to overcome the deficiency on the above-mentioned prior art, a kind of indium stannum alloy target that utilizes is proposed, can either adjust the chemical ingredients of the film that is coated with easily, make sedimentary film keep stable stoicheiometry, can suppress the phenomenon that target is poisoned, anode disappears and target surface is struck sparks again, improve the stability and the efficient of coating process, the employing intermediate frequency reaction magnetic controlled sputtering indium tin alloy target that plated film efficient and plated film homogeneity and film quality are improved greatly prepares the method and system of ITO film.
Realize the technical scheme of above-mentioned purpose:
A kind of method that adopts intermediate frequency reaction magnetic controlled sputtering indium tin alloy target to prepare the ITO film comprises the steps:
1) indium stannum alloy target and substrate to be coated are set in vacuum chamber;
2) the indium stannum alloy target is connected intermediate frequency power supply;
3) in vacuum chamber, feed working gas and the reactant gases preset, between indium stannum alloy target and substrate to be coated, form plasma slab, indium tin particle is sputtered out from the indium stannum alloy target;
4) the 451nm particular spectral lines intensity of the indium metal relevant in the described plasma emission spectroscopy of detection with the reactant gases dividing potential drop;
5) compare with the working gas that presets after 451nm particular spectral lines intensity process filtering, enhancing and the amplification with the detected indium metal of step 4), adjust reaction gas flow according to difference, form the reverse feedback control of reaction gas flow, be deposited on after making the indium tin particle generation oxidizing reaction in the plasma slab and forming transition state and wait to cross on the substrate of film.
Further, adopt optic probe to detect the 451nm characteristic spectral line intensity of indium metal in the plasma slab, by fibre system the 451nm characteristic spectral line intensity of indium metal is transferred to optical signal processing system, output plasma spectrometry strength signal after optical signal processing system filtering, enhancing and amplification, by the plasma spectrometry monitor controller described plasma light spectral intensity and the working point of presetting are compared, flow according to difference output signal control piezo electric valve conditioned reaction gas forms reverse feedback control.
Further, by the cooling system in the substrate clamping device deposition process is carried out at low temperatures.
Preferably, described reactant gases is an oxygen, and working gas is an argon gas, and the operating pressure of vacuum chamber is 0.3～0.6Pa, is coated with that substrate temperature is controlled at below 120 ℃ in the process.
A kind of intermediate frequency reaction magnetic controlled sputtering indium tin alloy target prepares the system of ITO film, comprise vacuum chamber, intermediate frequency power supply, the working gas steam line, the reactant gases steam line, variable valve, the plasma spectrometry monitor controller, optic probe and optical signal processing system, working gas steam line and reactant gases steam line stretch in the vacuum chamber, be used for feeding working gas and the reactant gases that presets to vacuum chamber, on the reactant gases steam line variable valve is set, the output terminal of intermediate frequency power supply is fixed on and is used to connect the indium stannum alloy target in the vacuum chamber, so that the plated film district forms plasma body above the indium stannum alloy target, described optic probe is with the optical signal input optical signal treatment system of particular spectral lines intensity relevant with the reactant gases dividing potential drop in the detected plasma emission spectroscopy, through optical signal processing system filtering, strengthen and amplify back output plasma spectrometry strength signal, the plasma spectrometry monitor controller carries out the reaction gas flow that difference is amplified back output regulating and controlling valve to the plasma spectrometry strength signal of input and the working point signal that presets, by optic probe, optical signal processing system and controller constitute reverse feedback control channel.
Further, be provided with the indium stannum alloy twin target in vacuum chamber, two output terminals of intermediate frequency power supply are respectively received on the indium stannum alloy target.
Further, comprise the mixed gas pipeline, described mixed gas pipeline is arranged on two below central axis between the indium stannum alloy target, and the lower end of mixed gas pipeline also connects the working gas steam line and the reactant gases steam line, and the upper end of mixed gas pipeline blows to twin target.Cooling system is set, so that the process of being coated with is deposited at low temperatures in vacuum chamber.
Adopt technique scheme, otherwise effective technique effect of the present invention is: 1, replace existing indium tin oxide (ITO) ceramic target with indium stannum alloy target (IT target), improved target utilization greatly, reduced production cost: because the price of indium is very expensive, the ITO target mainly relies on import, if adopt the ITO target, target utilization has only about 20～30% in the plated film, and the residue target can not reclaim voluntarily; Casting utilizes and adopt indium stannum alloy target residue target can reclaim again voluntarily, thereby has improved target utilization greatly, has reduced production cost.2, by detecting the 451nm particular spectral lines intensity of indium metal relevant in the plasma emission spectroscopy with the reactant gases dividing potential drop, through comparing with the working point of presetting after filtering, enhancing and the amplification, adjust reaction gas flow according to difference, form reaction gas flow reverse feedback control, be deposited on after making the indium tin particle generation oxidizing reaction in the plasma slab and forming transition state and wait to cross on the substrate of film.When for a certain reason, make the indium tin particle generation oxidizing reaction in the plasma slab but when departing from transition state (as: may become metallic state or chemical combination states of matter), because the degenerative effect of reaction gas flow can in time be regulated and get back to best working point, i.e. transition state state rapidly.Thereby can make sedimentary film keep stable stoicheiometry all the time, obtain performances such as excellent electric conductivity.3, by using intermediate frequency reaction magnetocontrol sputtering technology, the indium stannum alloy twin target particularly is set, two output terminals of intermediate frequency power supply are respectively received on the target, thereby can suppress the phenomenon that target is poisoned, anode disappears and target surface is struck sparks, improve the stability and the efficient of coating process, reach the effect of improving film performance, plated film efficient and plated film homogeneity and film quality are improved greatly.4, by cooling system is set in vacuum chamber, the process of being coated with is deposited at low temperatures.By selecting suitable parameters, show that 5, the product side's resistance that is coated with can reach that 20 Ω/below the, visible light transmissivity is more than 85% through the actual detected data.The invention provides a kind of ITO membrane technique that medium frequency reactive sputtering prepares low square resistance, high visible light transmissivity that carries out at low temperatures.
Description of drawings
Fig. 1 is a kind of system architecture synoptic diagram that adopts intermediate frequency reaction magnetic controlled sputtering indium tin alloy target to prepare the ITO film.
Embodiment
1 couple of the present invention is described in further detail below in conjunction with accompanying drawing:
A kind of method that adopts intermediate frequency reaction magnetic controlled sputtering indium tin alloy target to prepare the ITO film comprises the steps:
1) in operating pressure is the vacuum chamber of 0.3～0.6Pa, indium stannum alloy twin target and substrate to be coated are set;
2) the indium stannum alloy twin target is connected intermediate frequency power supply;
3) in vacuum chamber, feed reactant gases oxygen and the working gas argon gas preset, between indium stannum alloy target and substrate to be coated, form plasma slab, indium tin particle is sputtered out from the indium stannum alloy target;
4) by the cooling system in the substrate clamping device deposition process being controlled at below 120 ℃ at substrate temperature carries out.
5) adopt optic probe to detect the 451nm particular spectral lines intensity of indium metal relevant in the plasma slab emmission spectrum with the reactant gases dividing potential drop;
6) by fibre system the 451nm characteristic spectral line intensity of the detected indium metal of step 5) is transferred to optical signal processing system, through optical signal processing system filtering, strengthen and amplify back output plasma spectrometry strength signal, by the plasma spectrometry monitor controller described plasma spectrometry strength signal and the reactant gases working point of presetting are compared, flow according to difference output signal control piezo electric valve conditioned reaction gas, formation reverse feedback control is deposited on after making the indium tin particle generation oxidizing reaction in the plasma slab and forming transition state and waits to cross on the substrate of film.
Referring to Fig. 1, a kind ofly realize that above-mentioned intermediate frequency reaction magnetic controlled sputtering indium tin alloy target prepares the system of ITO film, the preset signal 10, plasma spectrometry monitor controller 11, optical signal processing system 12, piezo electric valve 13, fibre system 14, the optic probe 15 that comprise vacuum film coating chamber 1, substrate (glass or organic material) 2, shielding case 3, target 4, working gas (argon) steam line 5, mass flowmeter 6, reactant gases (oxygen) steam line 7, mass flowmeter 8, intermediate frequency power supply 9, setting working point, plasma body 16.Mixed gas steam line in vacuum film coating chamber 1 (reactant gases and working gas) guiding target 4, the reactant gases of the working gas and the piezo electric valve of flowing through converges after-blow to the substrate 2 that moves, twin target 4 is contained in the shielding case 3, the target of target 4 is an indium stannum alloy, two output terminals of intermediate frequency power supply 9 respectively connect a target 4, optic probe 15 and fibre system 14, optical signal processing system 12, the plasma spectrometry Monitoring systems that plasma spectrometry monitor controller 11 is formed constitutes reverse feedback control channel, the Strength Changes of the 451nm characteristic spectral line of the indium metal relevant in monitoring discharge plasma 16 emmission spectrum with the reactant gases oxygen partial pressure, the opening degree of the output signal control piezo electric valve 13 of plasma spectrometry monitor controller 11, thereby reach the flow of control reactant gases oxygen, realize feedback control.
During system works, utilize vacuum pump that coating chamber is evacuated to base vacuum earlier, be generally 10
-4The Pa level, then according to process program, feed working gas to coating chamber, adjust operating pressure to the 0.3～0.6Pa in the vacuum film coating chamber 1, the flow that reactant gases feeds is controlled by the piezo electric valve that is subjected to PEM control, power 400W～the 1000W or the operating voltage 300V～600V of selected intermediate frequency power supply 9 work, make gas produce glow discharge, between substrate and target, form plasma slab, and under the flow reverse feedback control action kou of reactant gases oxygen, make the indium tin particle generation oxidizing reaction in the plasma slab and form transition state (illustrate: in the reactive sputtering according to reactant gases how much, indium tin particle has three kinds of states in the plasma slab, metallic state, transition state, the chemical combination states of matter, best working point is in transition state) after be deposited on and wait to cross on the substrate of film, realize being coated with of ITO film.
Be coated with in the process substrate temperature below 120 ℃, need decide on crossing material.
Before system works, input is in advance set the preset signal 10 of working point and is given plasma spectrometry monitor controller 11, this preset signal 10 is reaction gas flows of correspondence when making the indium tin particle generation oxidizing reaction in the plasma slab in theory and forming transition state, when described transition state, the 451nm characteristic spectral line intensity level of a corresponding indium metal in the plasma slab.When accidentalia influences the dividing potential drop of reactant gases oxygen, the intensity of the 451nm characteristic spectral line of the indium in discharge plasma 16 emmission spectrum changes, optic probe 15 collects this variable signal, pass to optical signal processing system 12 by fibre system 14, signal is through filtering, strengthen and amplify back input plasma spectrometry monitor controller 11, plasma spectrometry monitor controller 11 is this input signal and preset signal 10 relatively, output signal is adjusted the operating voltage of piezo electric valve 13 again, adjust the reactant gases oxygen flow in real time, make the dividing potential drop of reactant gases oxygen get back to the expection level, realize feedback control.
By using intermediate frequency reaction magnetocontrol sputtering technology, improve the stability and the efficient of coating process, reach the effect of improving film performance, plated film efficient and plated film homogeneity and film quality are improved greatly.In addition, by using the indium stannum alloy target, the cost of target reduces.
Claims (10)
1, a kind of method that adopts intermediate frequency reaction magnetic controlled sputtering indium tin alloy target to prepare the ITO film comprises the steps:
1) the indium stannum alloy target is set in vacuum chamber;
2) the indium stannum alloy target is connected intermediate frequency power supply;
3) in vacuum chamber, feed working gas and the reactant gases preset, between indium stannum alloy target and substrate to be coated, form plasma slab, indium tin particle is sputtered out from the indium stannum alloy target;
4) the 451nm particular spectral lines intensity of the indium metal relevant in the described plasma emission spectroscopy of detection with the reactant gases dividing potential drop;
5) the 451nm particular spectral lines intensity with the detected indium metal of step 4) compares through after filtering, enhancing and the amplification and the working point of presetting, adjust reaction gas flow according to difference, form the reverse feedback control of reaction gas flow, be deposited on after making the indium tin particle generation oxidizing reaction in the plasma slab and forming transition state and wait to cross on the substrate of film.
2, employing intermediate frequency reaction magnetic controlled sputtering indium tin alloy target according to claim 1 prepares the method for ITO film, it is characterized in that: adopt optic probe to detect the 451nm characteristic spectral line intensity of indium metal in the plasma slab, by fibre system the 451nm characteristic spectral line intensity of indium metal is transferred to optical signal processing system, through optical signal processing system filtering, strengthen and amplify back output plasma spectrometry strength signal, by the plasma spectrometry monitor controller described plasma light spectral intensity and the working point of presetting are compared, flow according to difference output signal control piezo electric valve conditioned reaction gas forms reverse feedback control.
3, employing intermediate frequency reaction magnetic controlled sputtering indium tin alloy target according to claim 1 and 2 prepares the method for ITO film, it is characterized in that: the indium stannum alloy target that is provided with in vacuum chamber is a twin target, two output terminals of intermediate frequency power supply are respectively received on the indium stannum alloy target, and working gas and reactant gases mixing back are blowed to twin target along the below central axial direction between two indium stannum alloy targets.
4, employing intermediate frequency reaction magnetic controlled sputtering indium tin alloy target according to claim 3 prepares the method for ITO film, it is characterized in that: by the cooling system in the substrate clamping device deposition process is carried out at low temperatures.
5, employing intermediate frequency reaction magnetic controlled sputtering indium tin alloy target according to claim 3 prepares the method for ITO film, and it is characterized in that: described reactant gases is an oxygen, and working gas is an argon gas.
6, employing intermediate frequency reaction magnetic controlled sputtering indium tin alloy target according to claim 5 prepares the method for ITO film, and it is characterized in that: the operating pressure of vacuum chamber is 0.3～0.6Pa, is coated with that substrate temperature is controlled at below 120 ℃ in the process.
7, a kind of intermediate frequency reaction magnetic controlled sputtering indium tin alloy target prepares the system of ITO film, comprise vacuum chamber, power supply, the working gas steam line, the reactant gases steam line, variable valve and controller, working gas steam line and reactant gases steam line stretch in the vacuum chamber, be used for feeding working gas and the reactant gases that presets to vacuum chamber, on the reactant gases steam line variable valve is set, it is characterized in that: comprise optic probe and optical signal processing system, described controller is the plasma spectrometry monitor controller, described power supply is an intermediate frequency power supply, the output terminal of intermediate frequency power supply is fixed on and is used to connect the indium stannum alloy target in the vacuum chamber, so that the plated film district forms plasma body above the indium stannum alloy target, described optic probe is with the optical signal input optical signal treatment system of particular spectral lines intensity relevant with the reactant gases dividing potential drop in the detected plasma emission spectroscopy, through optical signal processing system filtering, strengthen and amplify back output plasma spectrometry strength signal, the plasma spectrometry monitor controller carries out the reaction gas flow that difference is amplified back output regulating and controlling valve to the plasma spectrometry strength signal of input and the working point signal that presets, by optic probe, optical signal processing system and gas ions spectrum monitoring controller constitute reverse feedback control channel.
8, prepare the system of ITO film according to the described intermediate frequency reaction magnetic controlled sputtering indium tin alloy of claim 6 target, it is characterized in that: be provided with the indium stannum alloy twin target in vacuum chamber, two output terminals of intermediate frequency power supply are respectively received on the indium stannum alloy target.
9, the system for preparing the ITO film according to the described intermediate frequency reaction magnetic controlled sputtering indium tin alloy of claim 7 target, it is characterized in that: comprise the mixed gas pipeline, described mixed gas pipeline is arranged on two below central axis between the indium stannum alloy target, the lower end of mixed gas pipeline also connects the working gas steam line and the reactant gases steam line, and the upper end of mixed gas pipeline blows to twin target.
10, described according to Claim 8 intermediate frequency reaction magnetic controlled sputtering indium tin alloy target prepares the system of ITO film, it is characterized in that: cooling system is set, so that the process of being coated with is deposited at low temperatures in vacuum chamber.
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