https://scholars.lib.ntu.edu.tw/handle/123456789/630174
標題: | N-Type Doping of Naphthalenediimide-Based Random Donor-Acceptor Copolymers to Enhance Transistor Performance and Structural Crystallinity | 作者: | Chang, Yun Wu, Ying Sheng SHIH-HUANG TUNG WEN-CHANG CHEN CHU-CHEN CHUEH CHENG-LIANG LIU |
關鍵字: | ambipolar | donor−acceptor | doping | naphthalene diimide | organic field effect transistors | 公開日期: | 1-一月-2022 | 出版社: | AMER CHEMICAL SOC | 卷: | 15 | 期: | 12 | 起(迄)頁: | 15745 | 來源出版物: | ACS Applied Materials and Interfaces | 摘要: | An integrated strategy of molecular design and conjugated polymer doping is proposed to improve the electronic characteristics for organic field effect transistor (OFET) applications. Here, a series of soluble naphthalene diimide (NDI)-based random donor-acceptor copolymers with selenophene π-conjugated linkers and four acceptors with different electron-withdrawing strengths (named as rNDI-N/S/NN/SS) are synthesized, characterized, and used for OFETs. N-type doping of NDI-based random copolymers using (12a,18a)-5,6,12,12a,13,18,18a,19-octahydro-5,6-dimethyl-13,18[1′,2′]-benzenobisbenzimidazo[1,2-b:2′,1′-d]benzo[i][2.5]benzodiazocine potassium triflate adduct (DMBI-BDZC) is successfully demonstrated. The undoped rNDI-N, rNDI-NN, and rNDI-SS samples exhibit ambipolar charge transport, while rNDI-S presents only a unipolar n-type characteristic. Doping with DMBI-BDZC significantly modulates the performance of rNDI-N/S OFETs, with a 3- to 6-fold increase in electron mobility (μe) for 1 wt % doped device due to simultaneous trap mitigation, lower contact resistance (RC), and activation energy (EA), and enhanced crystallinity and edge-on orientation for charge transport. However, the doping of intrinsic pro-quinoidal rNDI-NN/SS films exhibits unchanged or even reduced device performance. These findings allow us to manipulate the energy levels by developing conjugated copolymers based on various acceptors and quinoids and to optimize the dopant-polymer semiconductor interactions and their impacts on the film morphology and molecular orientation for enhanced charge transport. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/630174 | ISSN: | 19448244 | DOI: | 10.1021/acsami.2c23067 |
顯示於: | 材料科學與工程學系 |
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