TW201405579A - 透明導電性膜 - Google Patents
透明導電性膜 Download PDFInfo
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- TW201405579A TW201405579A TW102120190A TW102120190A TW201405579A TW 201405579 A TW201405579 A TW 201405579A TW 102120190 A TW102120190 A TW 102120190A TW 102120190 A TW102120190 A TW 102120190A TW 201405579 A TW201405579 A TW 201405579A
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- transparent conductive
- conductive film
- polycrystalline layer
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- 239000013078 crystal Substances 0.000 claims abstract description 20
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000000758 substrate Substances 0.000 claims description 25
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical group [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 8
- 229910052718 tin Inorganic materials 0.000 claims description 5
- 229910052738 indium Inorganic materials 0.000 claims description 4
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical group [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims description 4
- 239000004417 polycarbonate Substances 0.000 claims description 4
- -1 polyethylene terephthalate Polymers 0.000 claims description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 4
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 4
- 229920003050 poly-cycloolefin Polymers 0.000 claims description 3
- 229920000515 polycarbonate Polymers 0.000 claims description 3
- 239000002245 particle Substances 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 46
- 238000004544 sputter deposition Methods 0.000 description 8
- 238000002834 transmittance Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000012535 impurity Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 238000010191 image analysis Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000005355 Hall effect Effects 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000010454 slate Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- H—ELECTRICITY
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- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
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- C23C14/08—Oxides
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/34—Sputtering
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
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Abstract
本發明提供一種透射率較高、且比電阻較小之透明導電性膜。本實施形態之透明導電性膜1具備:膜基材2、及形成於該膜基材上之銦錫氧化物之多晶層3。該多晶層3之厚度為10 nm~30 nm,結晶粒徑之平均值為180 nm~270 nm,且載子密度超過6×1020個/cm3且為9×1020個/cm3以下。
Description
本發明係關於一種應用於能藉由手指或觸控筆等之接觸而輸入資訊之輸入顯示裝置等之透明導電性膜。
先前已知於膜基材上形成有銦錫氧化物之多晶層之透明導電性膜(專利文獻1)此種透明導電性膜之比電阻(亦稱為體積電阻率)較低,顯示出優異之導電性。
專利文獻1:日本專利特開平09-286070號公報
然而,近年來廣泛利用之智慧型手機(smart phone)或平板電腦(slate PC)等要求具有更優異之特性之透明導電性膜。尤其,於該等用途中,先前之透明導電性膜依然有比電阻較大之課題。
本發明之目的在於提供一種透射率較高、且比電阻較小之透明導電性膜。
為了達成上述目的,本發明之透明導電性膜之特徵在於:其係具有膜基材、及形成於該膜基材上之銦錫氧化物之多晶層者,且上述多晶層之厚度為10nm~30nm,結晶粒徑之平均值為180nm~270
nm,且載子密度超過6×1020個/cm3且為9×1020個/cm3以下。
又,上述多晶層之霍爾移動率為21cm2/V‧sec~30cm2/V‧sec。
又,上述銦錫氧化物之多晶層中之錫原子之量相對於添加有銦原子及錫原子之重量,超過6重量%且為15重量%。
進而,上述膜基材較佳為包含聚對苯二甲酸乙二酯、聚環烯烴或聚碳酸酯。
根據本發明,多晶層之厚度為10nm~30nm,該多晶層之結晶粒徑之平均值為180nm~270nm,且載子密度超過6×1020個/cm3且為9×1020個/cm3以下。即,抑制可因雜質之混合存在而產生之結晶粒徑之減少,藉此可充分抑制霍爾移動率之下降,此外,可實現良好之透射率。因此,可提供一種透射率較高、且比電阻較小之透明導電性膜。
1‧‧‧透明導電性膜
2‧‧‧膜基材
3‧‧‧多晶層
圖1係表示本發明之實施形態之透明導電性膜之構成的剖面圖。
圖2係表示多晶層之結晶粒界之電子顯微鏡圖像。
以下,一面參照圖式,一面詳細說明本發明之實施形態。
如圖1所示,本實施形態之透明導電性膜1具備:膜基材2、及形成於該膜基材上之銦錫氧化物之多晶層3。該多晶層3之厚度為10nm~30nm,結晶粒徑之平均值為180nm~270nm,且載子密度超過6×1020個/cm3且為9×1020個/cm3以下。
此種透明導電性膜之結晶粒徑較大,故而上述電子可於多晶層中移動之電子之量增多,故而比電阻特別減小。進而,多晶層之厚度較薄,故而透射率較高。
膜基材2較佳使用透明性與耐熱性兩者優異者。就製造品質優異之透明導電性膜方面而言,上述膜基材之厚度較佳為10μm~50μm。
作為形成上述膜基材之材料,較佳為聚對苯二甲酸乙二酯、聚環烯烴或聚碳酸酯。上述膜基材於其表面可具有用以提高銦錫氧化物之多晶層與膜基材之密著性之易接著層(anchor coating layer)、用以調整膜基材之反射率之折射率調整層(index-matching layer)、或用以提高膜基材之耐擦傷性之硬塗層(hard coating layer)。
多晶層3代表而言可藉由利用濺鍍法於膜基材之表面形成銦錫氧化物之非晶質層,並對該非晶質層進行加熱處理而獲得。
上述濺鍍法係藉由使於低壓氣體中產生之電漿中之陽離子與作為負電極之靶材碰撞,而使自上述靶材表面飛散之物質附著於基板上的方法。
該多晶層3之結晶粒徑之平均值為180nm~270nm,較佳為190nm~250nm。上述多晶層藉由具有此種尺寸之結晶粒(grain),而使該多晶層中之電子容易移動,比電阻減小。該情形之多晶層之霍爾移動率為21cm2/V‧sec~30cm2/V‧sec,較佳為24cm2/V‧sec~28cm2/V‧sec。
上述尺寸之結晶粒可藉由如下方式而獲得:以極力減少銦錫氧化物之非晶質層中所混入之雜質之方式使該非晶質層成膜,其後對該非晶質層進行加熱處理。再者,作為減少混入上述非晶質層中之雜質之量的方法,具體而言,例如可列舉:將成膜銦錫氧化物之非晶質層之濺鍍裝置的真空度減壓為5×10-5Pa以下,除去膜基材中之揮發成分(水分或有機氣體)的方法。
上述多晶層之載子密度超過6×1020個/cm3且為9×1020個/cm3以下,較佳為6.5×1020個/cm3~8×1020個/cm3。此種多晶層之可於該多晶層中移動之電子的量增多,故而比電阻減小。
顯示出此種載子密度之多晶層可藉由如下方式獲得:使銦錫氧化物之非晶質層中之錫原子的量相對於加上銦原子及錫原子之重量調整為超過6重量%且為15重量%以下,較佳為7重量%~12重量%,且對該非晶質層進行加熱處理以使結晶粒較大成長。
滿足上述尺寸之結晶粒徑及載子密度之條件的多晶層之比電阻未達4.0×10-4Ω‧cm,較佳為3.0×10-4Ω‧cm~3.8×10-4Ω‧cm。
根據本實施形態,多晶層之厚度為10nm~30nm,該多晶層之結晶粒徑之平均值為180nm~270nm,且載子密度超過6×1020個/cm3且為9×1020個/cm3以下。即,藉由抑制可因雜質之混入而產生之結晶粒徑的減少,可充分抑制霍爾移動率之降低,此外可實現良好之透射率。因此,可提供透射率較高、且比電阻較小之透明導電性膜。
繼而,說明本發明之實施例。
首先,將厚度23μm之包含聚對苯二甲酸乙二酯膜之膜基材放入濺鍍裝置中,將該濺鍍裝置之真空度減壓為5×10-5Pa,除去該濺鍍裝置內以及膜基材中之水分及有機氣體。其後,於上述濺鍍裝置內導入氬氣98體積%及氧氣2體積%之混合氣體,於膜基材之一側,使非晶質層中之錫原子之量相對於加上銦原子及錫原子之重量為10重量%之方式,形成厚度25nm之銦錫氧化物之非晶質層。
並且,將形成有銦錫氧化物之非晶質層之膜基材自濺鍍裝置取出,於140℃之加熱烘箱中對該非晶質層進行加熱處理90分鐘,藉此使其結晶化,獲得結晶粒徑之平均值為207nm之多晶層。
繼而,藉由以下之方法,對上述實施例1之透明導電性膜進行測定‧評估。
利用透射型電子顯微鏡(日立製作所製造,製品名「H-7650」),
以直接倍率100,000倍觀察多晶層之表面,以加速電壓10kV進行照相攝影。對該照片實施圖像解析處理,進行結晶粒界之識別。將該圖像解析處理後之圖像示於圖2。並且,基於本識別之結果,以各結晶粒之形狀中最長徑作為粒徑(nm),求出其平均值。
使用霍爾效果測定系統(BIO-RAD公司製造,製品名「HL5500PC」)測定多晶層之載子密度及霍爾密度。
以藉由4端子法求出之表面電阻值乘以該多晶層之厚度求出多晶層之比電阻。
利用透射型電子顯微鏡(日立製作所製造,製品名「H-7650」),觀察結晶粒之有無。
將上述(1)~(4)之測定‧評估結果示於表1。再者,作為表1之參考例,記載有日本專利特開平09-286070號公報所揭示之實施例4中之透明導電性膜的特性。
根據表1可知,實施例之透明導電性膜中,由於形成有粒徑較大之結晶粒,因此霍爾移動率之值與作為非晶質之參考例同等,且載子密度之值大幅增加,其結果比電阻減小。因此,根據本實施例可知,
可製作透射率較高、且比電阻較小之透明導電性膜。
本發明之透明導電性膜並無特別限制,較佳用於智慧型手機或平板電腦。
1‧‧‧透明導電性膜
2‧‧‧膜基材
3‧‧‧多晶層
Claims (4)
- 一種透明導電性膜,其特徵在於:其係具有膜基材、及形成於該膜基材上之銦錫氧化物之多晶層者,且上述多晶層之厚度為10nm~30nm,結晶粒徑之平均值為180nm~270nm,且載子密度超過6×1020個/cm3且為9×1020個/cm3以下。
- 如請求項1之透明導電性膜,其中上述多晶層之霍爾移動率為21cm2/V‧sec~30cm2/V‧sec。
- 如請求項1或2之透明導電性膜,其中上述銦錫氧化物之多晶層中之錫原子之量相對於加上銦原子及錫原子之重量,超過6重量%且為15重量%以下。
- 如請求項1至3中任一項之透明導電性膜,其中上述膜基材包含聚對苯二甲酸乙二酯、聚環烯烴或聚碳酸酯。
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TWI554623B (zh) * | 2014-05-20 | 2016-10-21 | Nitto Denko Corp | Transparent conductive film |
US10720264B2 (en) | 2015-11-09 | 2020-07-21 | Nitto Denko Corporation | Light transmitting conductive film and light control film |
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US20170051398A1 (en) * | 2014-04-30 | 2017-02-23 | Nitto Denko Corporation | Transparent conductive film and method for producing the same |
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USD806664S1 (en) | 2015-11-18 | 2018-01-02 | Samsung Electronics Co., Ltd. | Television |
USD806662S1 (en) | 2015-11-18 | 2018-01-02 | Samsung Electronics Co., Ltd. | Television |
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TWI554623B (zh) * | 2014-05-20 | 2016-10-21 | Nitto Denko Corp | Transparent conductive film |
US10720264B2 (en) | 2015-11-09 | 2020-07-21 | Nitto Denko Corporation | Light transmitting conductive film and light control film |
TWI716486B (zh) * | 2015-11-09 | 2021-01-21 | 日商日東電工股份有限公司 | 透光性導電膜及調光膜 |
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