Naphthalenediimide-Benzothiadiazole Copolymer Semiconductors: Rational Molecular Design for Air-Stable Ambipolar Charge Transport

被引:43
作者
Gu, Chunling [1 ]
Hu, Wenping [1 ]
Yao, Jiannian [1 ]
Fu, Hongbing [1 ]
机构
[1] Chinese Acad Sci, Inst Chem, BNLMS, Bei Jing 100190, Peoples R China
基金
中国国家自然科学基金;
关键词
naphthalene diimide copolymer; air-stable ambipolar polymer semiconductor; balanced ambipolar charge transport; donor-acceptor conjugated copolymer; FIELD-EFFECT TRANSISTORS; HIGH-PERFORMANCE AMBIPOLAR; LOW-BANDGAP; N-CHANNEL; POLYMER; ELECTRON; MOBILITY; ACCEPTOR; DONOR; HOLE;
D O I
10.1021/cm401122h
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Rational design of air-stable ambipolar polymeric semiconductors was achieved by covalently connecting naphthalenediimide (NDI) units with benzothiadiazole (BZ) through thiophene (T) linkers, namely, PNDI-mT(BZ)mT (m = 1, 2), in which well-coplanar mT(BZ)mT moieties as a whole act as donors rather than acceptors reported in previous studies. Decreasing the number of thiophene linkers from m = 2 to 1 lowers both LUMO and HOMO energy levels. As a result, the carriers in organic thin film transistors (OTFTs) could be switched from unipolar p-channel only to ambipolar transport. In ambient conditions, PNDI-2T(BZ)2T presents an average hole mobility of 0.07 +/- 0.02 cm(2) V-1 s(-1), while PNDI-T(BZ) T exhibits balanced ambipolar charge transport in a bottom-gate/top-contact device architecture, the average electron and hole mobilities was 0.05 +/- 0.02 (mu(e)) and 0.1 +/- 0.03 (mu(h)) cm(2) V-1 s(-1), respectively. Moreover, OTFTs based on both polymer show good air-stability with negligible changes after stored in ambient over 3 months.
引用
收藏
页码:2178 / 2183
页数:6
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