JP2006191115A - フッ素系高分子薄膜を含む有機薄膜トランジスタ及びフッ素系高分子薄膜を含む有機薄膜トランジスタの製造方法 - Google Patents
フッ素系高分子薄膜を含む有機薄膜トランジスタ及びフッ素系高分子薄膜を含む有機薄膜トランジスタの製造方法 Download PDFInfo
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- H10K10/462—Insulated gate field-effect transistors [IGFETs]
- H10K10/468—Insulated gate field-effect transistors [IGFETs] characterised by the gate dielectrics
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Abstract
【解決手段】基板上1にゲート電極2、ゲート絶縁層3、有機半導体層5、ソース電極6及びドレイン電極7を含む有機薄膜トランジスタにおいて、ゲート絶縁層3と有機半導体層5との界面にフッ素系高分子層4を含む有機薄膜トランジスタを提供する。
【選択図】図1
Description
本発明に係るOTFTは、基板と、基板上に形成されたゲート電極と、ゲート電極上に形成されたゲート絶縁層と、ゲート絶縁層上に形成されたフッ素系高分子物質からなる薄膜と、フッ素系高分子薄膜上に形成された有機半導体層として作用する高分子半導体と、ソース/ドレイン電極と、を含む。
なお、実施例は、本発明の構成と効果の説明を目的としたもので、本発明の技術的範囲を制限するものと解してはならない。
(1)3,4−ジフルオロ−ベンゾ酸4−(2−クロロカルボニル−ビニル)−フェニルエステル(3,4−Difluoro−benzoic acid 4−(2−chlorocarbonyl−vinyl)−phenyl ester)の合成
3,4−ジフルオロ−ベンゾ酸4−(2−クロロカルボニル−ビニル)−フェニルエステル10g(21.68mmoL)を塩化メチレン200mLに溶かした後、塩化チオニル(SOCl2)2.84g(23.848mmoL)を入れて35℃で6時間攪拌し、溶媒を除去した。その後真空乾燥を行った後、所望の(1)のフッ素系高分子薄膜形成用組成物を得た(収率90%)。
ポリヒドロキシマレイミド−ポリヒドロキシスチレン2.74g(9.033mmoL)をL−メチルピロリドン50mLに溶解させ、0℃に降温した後、トリエチルアミン(Et3N)3.291g(32.52mmoL)を仕込んで30分間攪拌し、その後(1)3,4−ジフルオロ−ベンゾ酸4−(2−クロロカルボニル−ビニル)−フェニルエステル6.995g(21.679mmoL)を投入して4時間常温で攪拌した。反応溶液を水とメタノールに注ぎ、得られた固体を濾過した。水で多数回洗浄した後、真空乾燥させて所望の(2)のマレイミド−スチレン共重合誘導を得た(収率60%)。
このような反応スキームは、下記反応式(23)で表わすことができる。
(1)4−[6−(3,4,5−トリフルオロ−フェノキシ)−ヘキシルオキシ]−ベンゾ酸(4−[6−(3,4,5−Trifluoro−phenoxy)−hexyloxy]−benzoic acid)の合成
4−[6−(3,4,5−トリフルオロ−フェノキシ)−ヘキシルオキシ]−ベンゾ酸エチルエステル(4−[6−(3,4,5−Trifluoro−phenoxy)−hexyloxy]−benzoic acid ethyl ester)2.75gを1,4−ジオキサン(1,4−Dioxane)100mLに溶解させた後、NaOH1.0M溶液100mLを投入して一日中攪拌した。反応溶液に10%HCl溶液で酸性化した後、固体を濾過した。エタノールで再結晶して4−[6−(3,4,5−トリフルオロ−フェノキシ)−ヘキシルオキシ]−ベンゾ酸を得た(収率62%)。
4−[6−(3,4,5−トリフルオロ−フェノキシ)−ヘキシルオキシ]−ベンゾ酸10g(27.148mmoL)を塩化メチレン(Methylene chloride)200mLに溶解させた後、塩化チオニル(Thionyl chloride)3.55g(29.862mmoL)を投入して35℃で6時間攪拌し、溶媒を除去した。その後、真空乾燥させた後、所望の(1)の化合物を得た(収率95%)。
ポリヒドロキシマレイミド−ポリヒドロキシスチレン2.74g(9.033mmoL)をN−メチルピロリドン50mLに溶解させ、0℃に降温した後、トリエチルアミン3.291g(32.52mmoL)を投入して30分間攪拌し、その後(2)4−[6−(3,4,5−トリフルオロ−フェノキシ)−ヘキシルオキシ]−ベンゾイルクロライド8.385g(21.679mmoL)を入れて4時間常温で攪拌した。反応溶液を水とメタノールに注ぎ、得られた固体を濾過した。水で多数回洗浄した後、真空乾燥させて所望の(2)の化合物を得た(収率71%)。
このような反応スキームは、下記反応式(24)で表わすことができる。
アルミニウムからなるゲート電極が形成されたガラス基板上に、ポリビニルフェニル系共重合体にアクリル系架橋剤を混合した有機絶縁体組成物を用いてスピンコーティング法でコートして厚さ7000Åの絶縁層を形成した後、窒素雰囲気の下で温度を100℃にして1時間ベーキングし、総厚さ6000Åのゲート絶縁層を形成した。その上に前記製造例1の組成物をシクロヘキサノンに2wt%で溶解させて3000rpmでスピンコーティング法によって300Åの厚さにコートした後、150℃で10分間硬化させた。製造されたフッ素系高分子薄膜上に、スピンコーティング法を用いて、ポリチオフェン系誘導体である高分子半導体物質で有機半導体層を500Åの厚さに形成した。活性層の形成は、窒素雰囲気の条件下に行った。前記製造された活性層上に、チャネル長100μm、チャネル幅1mmのシャドーマスクを用いてトップコンタクト方式によってAuからソース電極及びドレイン電極を形成することにより、OTFTを製作した。製作したOTFTの電荷移動度、しきい値電圧、およびIon/Ioff比を次のように測定して表1に示した。
*電荷移動度およびしきい値電圧
電荷移動度は、下記飽和領域(saturation region)電流式(1)から(ISD)1/2とVGを変数としたグラフを得、そのグラフの傾きから求めた:
フッ素系高分子物質として、製造例2で得た高分子フッ素化合物を使用した以外は、実施例1と同様にしてOTFTを製作し、電荷移動度、しきい値電圧およびIon/Ioff比を次のように測定して下記表1に示した。
図5は実施例2および比較例1で得たOTFTの電流伝達特性曲線を示すもので、有効誘電率が増加したときのISD対VGの変化を示す図面である。
フッ素系高分子薄膜を形成しない以外は、実施例1と同様にしてOTFTを製作し、電荷移動度、しきい値電圧およびIon/Ioff比を次のように測定して下記表1に示した。図4および図5に有効誘電率が増加したときのISD対VGの変化を実施例と共に示した。
Claims (13)
- 基板、ゲート電極、ゲート絶縁層、有機半導体層、およびソース/ドレイン電極を含む有機薄膜トランジスタにおいて、
下記化学式(1)で表わされる繰り返し単位及び/又は化学式(2)で表わされる繰り返し単位よりなる群から選択された1種以上の繰り返し単位からなる高分子であって、前記高分子を構成する主鎖または側鎖の原子のうち炭素原子に対するフッ素原子の比率が5:1〜30:1である化合物で形成されたフッ素系高分子薄膜を前記ゲート絶縁層と前記有機半導体層との界面に含むことを特徴とするフッ素系高分子薄膜を含む有機薄膜トランジスタ。
- 前記フッ素系高分子薄膜は、スピンコーティング、ディップコーティング、プリンティング方式、インクジェットコーティングまたはロールコーティングによって形成されるか、または蒸着されることを特徴とする請求項1に記載のフッ素系高分子薄膜を含む有機薄膜トランジスタ。
- 前記フッ素系高分子薄膜の膜厚は、100Å〜300Åであることを特徴とする請求項1に記載のフッ素系高分子薄膜を含む有機薄膜トランジスタ。
- 前記ゲート絶縁層は、ポリビニルフェノール、ポリメチルメタクリレート、ポリアクリレート、ポリビニルアルコール、SiNx(0<x<4)、SiO2、Al2O3およびこれらの誘導体よりなる群から選ばれることを特徴とする請求項1に記載のフッ素系高分子薄膜を含む有機薄膜トランジスタ。
- 前記有機半導体層は、ポリチオフェン、ポリアニリン、ポリアセチレン、ポリピロール、ポリフェニレンビニレンおよびこれらの誘導体よりなる群から選ばれることを特徴とする請求項1に記載のフッ素系高分子薄膜を含む有機薄膜トランジスタ。
- 前記ゲート電極、前記ソース電極および前記ドレイン電極は、それぞれ金(Au)、銀(Ag)、アルミニウム(Al)、ニッケル(Ni)、モリブデン(Mo)、タングステン(W),インジウム錫酸化物(ITO)、ポリチオフェン(polythiophene)、ポリアニリン(polyaniline)、ポリアセチレン(polyacetylene)、ポリピロール(polypyroole)、ポリフェニレンビニレン(polyphenylene vinylene)、およびPEDOT(polyethylenedioxythiophene)/PPS(polystyrenesulfonate)混合物よりなる群から選ばれることを特徴とする請求項1に記載のフッ素系高分子薄膜を含む有機薄膜トランジスタ。
- 前記基板は、ガラス、シリコンまたはプラスチックよりなる群から選ばれることを特徴とする請求項1に記載のフッ素系高分子薄膜を含む有機薄膜トランジスタ。
- 前記有機薄膜トランジスタは、トップコンタクト構造、ボトムコンタクト構造またはトップゲート構造であることを特徴とする請求項1に記載のフッ素系高分子薄膜を含む有機薄膜トランジスタ。
- 有機薄膜トランジスタを製造するにおいて、ゲート絶縁層と有機半導体層との間に、下記化学式(9)で表わされる繰り返し単位および化学式(10)で表わされる繰り返し単位よりなる群から選択された1種以上の繰り返し単位からなる高分子であって、この際、前記高分子を構成する主鎖または側鎖の原子のうち炭素原子に対するフッ素原子の比率が5:1〜30:1である化合物でコートしてフッ素系高分子薄膜を形成する段階を含むことを特徴とするフッ素系高分子薄膜を含む有機薄膜トランジスタの製造方法。
- 前記有機薄膜トランジスタは、トップコンタクト構造、ボトムコンタクト構造またはトップゲート構造であることを特徴とする請求項10に記載のフッ素系高分子薄膜を含む有機薄膜トランジスタの製造方法。
- 前記有機薄膜トランジスタは、基板上に形成されたゲート電極、ゲート絶縁層、フッ素系高分子薄膜、有機半導体層、およびソース/ドレイン電極を含むことを特徴とする請求項10に記載のフッ素系高分子薄膜を含む有機薄膜トランジスタの製造方法。
- 前記フッ素系高分子薄膜は、スピンコーティング、ディップコーティング、プリンティング方式、インクジェットコーティングまたはロールコーティングによって形成されるか、または蒸着されることを特徴とする請求項10に記載のフッ素系高分子薄膜を含む有機薄膜トランジスタの製造方法。
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- 2005-12-22 EP EP05257977A patent/EP1679754B1/en not_active Ceased
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KR101532759B1 (ko) * | 2008-04-03 | 2015-06-30 | 캠브리지 디스플레이 테크놀로지 리미티드 | 유기 박막 트랜지스터 |
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CN102484141A (zh) * | 2009-09-15 | 2012-05-30 | 住友化学株式会社 | 光交联性有机薄膜晶体管绝缘层材料 |
Also Published As
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US7364940B2 (en) | 2008-04-29 |
JP4902203B2 (ja) | 2012-03-21 |
DE602005004752D1 (de) | 2008-03-27 |
EP1679754B1 (en) | 2008-02-13 |
CN100514696C (zh) | 2009-07-15 |
DE602005004752T2 (de) | 2009-03-05 |
CN1825651A (zh) | 2006-08-30 |
KR101086159B1 (ko) | 2011-11-25 |
EP1679754A1 (en) | 2006-07-12 |
KR20060081443A (ko) | 2006-07-13 |
US20060151781A1 (en) | 2006-07-13 |
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