JP5613948B2 - 有機半導体微粒子材料、有機半導体薄膜、有機半導体膜形成用分散液および有機半導体薄膜の製造方法 - Google Patents
有機半導体微粒子材料、有機半導体薄膜、有機半導体膜形成用分散液および有機半導体薄膜の製造方法 Download PDFInfo
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- JP5613948B2 JP5613948B2 JP2012531786A JP2012531786A JP5613948B2 JP 5613948 B2 JP5613948 B2 JP 5613948B2 JP 2012531786 A JP2012531786 A JP 2012531786A JP 2012531786 A JP2012531786 A JP 2012531786A JP 5613948 B2 JP5613948 B2 JP 5613948B2
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- 229930192474 thiophene Natural products 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- UBOXGVDOUJQMTN-UHFFFAOYSA-N trichloroethylene Natural products ClCC(Cl)Cl UBOXGVDOUJQMTN-UHFFFAOYSA-N 0.000 description 1
- 229960002415 trichloroethylene Drugs 0.000 description 1
- ABVVEAHYODGCLZ-UHFFFAOYSA-N tridecan-1-amine Chemical compound CCCCCCCCCCCCCN ABVVEAHYODGCLZ-UHFFFAOYSA-N 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- YFNKIDBQEZZDLK-UHFFFAOYSA-N triglyme Chemical compound COCCOCCOCCOC YFNKIDBQEZZDLK-UHFFFAOYSA-N 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000001132 ultrasonic dispersion Methods 0.000 description 1
- 238000000870 ultraviolet spectroscopy Methods 0.000 description 1
- 238000001039 wet etching Methods 0.000 description 1
- DJWUNCQRNNEAKC-UHFFFAOYSA-L zinc acetate Chemical compound [Zn+2].CC([O-])=O.CC([O-])=O DJWUNCQRNNEAKC-UHFFFAOYSA-L 0.000 description 1
- YVTHLONGBIQYBO-UHFFFAOYSA-N zinc indium(3+) oxygen(2-) Chemical compound [O--].[Zn++].[In+3] YVTHLONGBIQYBO-UHFFFAOYSA-N 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
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Description
(ただし、式中、R1、R2は、それぞれ独立に、炭素数が1〜22の分岐または非分岐のアルキル基であり、N、O、S又はPのヘテロ原子を含んでいてもよい。)
(ただし、式中、R1、R2は、それぞれ独立に、炭素数が1〜22の分岐または非分岐のアルキル基であり、N、O、S又はPのヘテロ原子を含んでいてもよい。)
[製造例1:化合物Aの合成]
まず、ペリレンテトラカルボン酸無水物3.9gと、トリデシルアミン4.4g、無水酢酸亜鉛0.6gとを、N−メチル−2−ピロリドン50ml中に分散させ、窒素気流下、160℃で4時間攪拌する。冷却後、濾過し、濾物をメタノール・希塩酸、次いで水の順に洗浄する。その後、乾燥して5.90gのN,N’−トリデシル−3,4,9,10−ペリレンテトラカルボキシジイミドを得た(収率70%)。得られた化合物は、カラムクロマトを用いて分取し、再結晶により精製し、粗粒子として、PTCDI−C13(化合物A)を得た。示差走査熱量測定熱分析(DSC)による吸熱ピーク(室温〜250℃まで測定):102℃、155℃、182℃、209℃(図7参照)。
上記で得られた化合物Aを0.01質量%となるようにアセトニトリル(比誘電率37.5)に混合し、レーザーアブレーション法(波長532nm、強度100mJ/cm2照射時間10分)によって微粒子分散液を調製した。得られた分散液A1は、平均粒子径45nm、標準偏差14nm(動的光散法)であった。この分散液の粒子径分布を図3に示した。また、分散液の吸収特性を紫外可視分光光度計により測定した。分散前(bfTrr)、分散直後(afTrr_soon)、3時間後(afTrr 3h)、一日後(afTrr 1d)、三日後(afTrr 3d)および、10日間後(afTrr 10d)の吸収特性の変化を、図4にそれぞれ示した。
上記で得られた化合物Aを0.05質量%となるようにエタノール(比誘電率24.3)に混合し、レーザーアブレーション法(波長532nm、強度150mJ/cm2、照射時間10分)によって調製した。得られた分散液を10日間静置後、上澄み液を除去して、下層に分離している調製液を分散液A2とした。
上記で得られた化合物Aを0.05質量%となるようにジクロロエタン(比誘電率10.5)に混合し、レーザーアブレーション法(波長532nm、強度130mJ/cm2、照射時間10分)によって微粒子分散液を調製した。得られた分散液A3は、平均粒子径250nm、標準偏差140nm(動的光散法)であった。
上記で得られた化合物Aを0.1質量%となるようにアセトニトリル(比誘電率37.5)に混合し、レーザーアブレーション法(波長532nm、強度100mJ/cm2照射時間10分)によって微粒子分散液を調製した。また、分散液A4は、分散安定性が優れており、作製直後と30日後の紫外可視吸収特性は、変化しなかった。
薄膜トランジスタの電気特性は、AGILENT B1500Aで室温・真空下にて測定した。ID(ドレイン電流)−VD(ドレイン電圧)特性のVDの掃引方向は0から100Vとし、VG(ゲート電圧)は100から0Vまで20V刻みにした。ID−VG特性は、VD=100VにおいてVGを0から100Vまで掃引して測定した。
(ID)1/2−VG特性の直線領域と式(1)から、移動度:μを算出した。
ゲート絶縁体層となる酸化シリコン膜(厚さ200nm)を表面に有するシリコン基板を用意し、ITO(150nm)をスパッタ製膜し、フォトリソグラフィとウェットエッチングを用いてソース電極、およびドレイン電極をパターニングした。このときのチャネル長、チャネル幅は10μm、1,000μmであった。その後、孔を有するPDMS(ポリジメチルシロキサン)シートを基板に密着させ、その孔に実施例1の分散液A1をシリンジフィルター(0.45μm)で濾過後、10μlキャストにてシリコン基板上に有機半導体薄膜を形成し、真空中において50℃、1時間の乾燥・熱処理を行った。
実施例5と同様に、実施例2で得た分散液A2を用いて、有機薄膜トランジスタを作製した。このトランジスタについて、異なるゲート電圧毎でのドレイン電圧とドレイン電流とを測定した。ドレイン電流−ドレイン電圧曲線に明澄な飽和領域が認められたことから、典型的なn型特性を有する電界効果トランジスタとして駆動することが示された。40℃の真空オーブン中で1時間乾燥し、高真空下でトランジスタ特性を測定した。ドレイン電流−ドレイン電圧曲線から算出したトランジスタ特性値は、2.49×10-6cm2/Vs、しきい電圧値は3.9Vであった。結果を表1に示した。
実施例5と同様に、実施例3で得た分散液A3を使用前に超音波処理した分散液を用いて有機薄膜トランジスタを作製した。得られた各トランジスタについて、異なるゲート電圧毎でのドレイン電圧とドレイン電流とを測定した。ドレイン電流−ドレイン電圧曲線に明澄な飽和領域が認められたことから、典型的なn型特性を有する電界効果トランジスタとして駆動することが示された。40℃の真空オーブン中で1時間乾燥し、高真空下でトランジスタ特性を測定した後、さらに真空オーブン中で設定温度(100〜160℃)、10時間熱処理を行い、トランジスタ特性を再測定した。熱処理温度、およびドレイン電流−ドレイン電圧曲線から算出したトランジスタ特性値を表2に示した。
ゲート絶縁体層となる酸化シリコン膜(厚さ200nm)を表面に有するシリコン基板を用意し、シャドーマスクを用いて、ソース/ドレイン電極として金電極(100nm)のパターンを形成した。このときのチャネル長、チャネル幅は10μm、1,000μmであった。その後、分散液A3を基板にピペットにて2μlをキャストして、シリコン基板上に有機半導体薄膜を形成し、真空中において40℃、1時間乾燥した。
ドレイン電流−ドレイン電圧曲線に明澄な飽和領域が認められたことから、典型的なn型特性を有する電界効果トランジスタとして駆動することが示された。ドレイン電流−ドレイン電圧曲線から算出したトランジスタ特性値は、3.3×10-5cm2/Vs、しきい電圧値は38Vであった。
実施例11で作製した有機薄膜トランジスタを180℃、10時間、真空オーブン中で熱処理し、実施例11の有機薄膜トランジスタを得た。
ドレイン電流−ドレイン電圧曲線に明澄な飽和領域が認められたことから、典型的なn型特性を有する電界効果トランジスタとして駆動することが示された。ドレイン電流−ドレイン電圧曲線から算出したトランジスタ特性値は、1.8×10-4cm2/Vs、しきい電圧値は64Vであった。
ゲート絶縁体層となる酸化シリコン膜(厚さ200nm)を表面に有するシリコン基板を用意し、シャドーマスクを用いて、ソース/ドレイン電極として金電極(100nm)のパターンを形成した。このときのチャネル長、チャネル幅は10μm、1,000μmであった。基板を洗浄した後、ODTS(オクタデシルトリクロロシラン)を含むトルエン溶液を基板上に滴下し、40℃にて10分間の処理を行った。再び基板を洗浄し、その後、分散液A4を基板にピペットにて5μlをキャストして、真空中(40℃)で乾燥し、シリコン基板上に有機半導体薄膜を形成した。
ドレイン電流−ドレイン電圧曲線に明澄な飽和領域が認められたことから、典型的なn型特性を有する電界効果トランジスタとして駆動することが示された。ドレイン電流−ドレイン電圧曲線から算出したトランジスタ特性値は、1.1×10-3cm2/Vs、しきい電圧値は47V、オンオフ比は103であった。
実施例13で作製した素子を高純度窒素雰囲気下で180℃の熱処理をした。AFM(原子間力顕微鏡)により、得られた素子の有機半導体薄膜を観察すると、熱処理を行うことにより表面が平滑になり均一な膜となっていることが確認できた。
ドレイン電流−ドレイン電圧曲線に明澄な飽和領域が認められたことから、典型的なn型特性を有する電界効果トランジスタとして駆動することが示された。ドレイン電流−ドレイン電圧曲線から算出したトランジスタ特性値は、2.7×10-2cm2/Vs、しきい電圧値は50V、オンオフ比は105であった。
12:ソース電極
13:ドレイン電極
14:ゲート電極
15:有機半導体薄膜
16:基板
Claims (8)
- 微粒子材料を、該材料の溶解度が5質量%以下である有機溶媒に分散させてなる分散液を塗工し、形成した塗工膜を100℃〜250℃の温度に加熱処理して塗工膜中の微粒子材料を液晶状態に相転移させて、その後に冷却して再び結晶状態にして有機半導体薄膜を形成する際に使用される、微粒子状の有機半導体材料であって、
該微粒子は、下記一般式(1)で表わされるペリレンテトラカルボキシジイミド誘導体からなり、且つ、100℃〜250℃の温度に加熱されると液晶状態へと相転移するサーモトロピック液晶であることを特徴とする有機半導体微粒子材料。
(ただし、式中、R1、R2は、それぞれ独立に、炭素数が1〜22の分岐または非分岐のアルキル基であり、N、O、S又はPのヘテロ原子を含んでいてもよい。) - 前記微粒子の平均粒子径が、10nmから10μmであり、前記有機溶媒の比誘電率が2〜60である請求項1または2に記載の有機半導体微粒子材料。
- 請求項1〜3のいずれか1項に記載の有機半導体微粒子材料によって形成されてなることを特徴とする有機半導体薄膜。
- 有機半導体膜を形成するために用いられる分散液であって、請求項1〜3のいずれか1項に記載の有機半導体微粒子材料を、該材料の溶解度が5質量%以下であり、且つ、比誘電率が2〜60である有機溶媒に分散させてなることを特徴とする有機半導体膜形成用分散液。
- 前記有機溶媒の比誘電率が、24.3〜60である請求項5に記載の有機半導体膜形成用分散液。
- 前記有機溶媒が、アセトニトリル又はエタノールである請求項5又は6に記載の有機半導体膜形成用分散液。
- 請求項5〜7のいずれか1項に記載の有機半導体膜形成用分散液を基板に塗工して乾燥後、形成された塗工膜を100℃〜250℃の温度に加熱処理して塗工膜中の有機半導体微粒子材料を液晶状態へ相転移させ、その後に冷却して再び結晶状態にすることで基板上に均一な有機半導体薄膜を形成することを特徴とする有機半導体薄膜の製造方法。
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US20130153884A1 (en) | 2013-06-20 |
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CN103081149A (zh) | 2013-05-01 |
EP2613375A4 (en) | 2017-04-12 |
EP2613375A1 (en) | 2013-07-10 |
KR101473124B1 (ko) | 2014-12-15 |
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US9518224B2 (en) | 2016-12-13 |
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