Charge Mobility Enhancement for Conjugated DPP-Selenophene Polymer by Simply Replacing One Bulky Branching Alkyl Chain with Linear One at Each DPP Unit

Wang, Zhijie; Liu, Zitong; Ning, Lu; Xiao, Mingfei; Yi, Yuanping; Cai, Zhengxu; Sadhanala, Aditya; Zhang, Guanxin; Chen, Wei; Sirringhaus, Henning; Zhang, Deqing

doi:10.1021/acs.chemmater.8b01007

Title: Charge Mobility Enhancement for Conjugated DPP-Selenophene Polymer by Simply Replacing One Bulky Branching Alkyl Chain with Linear One at Each DPP Unit

Journal Article · Tue Apr 17 00:00:00 EDT 2018 · Chemistry of Materials

DOI:https://doi.org/10.1021/acs.chemmater.8b01007· OSTI ID:1439556

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^[2]; Ning, Lu ^[1]; Xiao, Mingfei ^[3];

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Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China)
Chinese Academy of Sciences (CAS), Beijing (China)
Univ. of Cambridge, Cambridge (United Kingdom)
Beijing Institute of Technology, Beijing (China)
Argonne National Lab. (ANL), Lemont, IL (United States); The Univ. of Chicago, Chicago, IL (United States)

Here, we demonstrate a simple, but efficient, approach for improving the semiconducting performances of DPP-based conjugated D-A polymers. This approach involves the replacement of one bulky branching alkyl chain with the linear one at each DPP unit in regular polymer PDPPSe-10 and PDPPSe-12. The UV–vis absorption, Raman spectra, PDS data, and theoretical calculations support that the replacement of bulky branching chains with linear ones can weaken the steric hindrance, and accordingly conjugated backbones become more planar and rigid. GIWAXS data show that the incorporation of linear alkyl chains as in PDPPSe-10 and PDPPSe-12 is beneficial for side-chain interdigitation and interchain dense packing, leading to improvement of interchain packing order and thin film crystallinity by comparing with PDPPSe, which contains branching alkyl chains. On the basis of field-effect transistor (FET) studies, charge mobilities of PDPPSe-10 and PDPPSe-12 are remarkably enhanced. Hole mobilities of PDPPSe-10 and PDPPSe-12 in air are boosted to 8.1 and 9.4 cm² V^–1 s^–1, which are about 6 and 7 times, respectively, than that of PDPPSe (1.35 cm² V^–1 s^–1). Furthermore, both PDPPSe-10 and PDPPSe-12 behave as ambipolar semiconductors under a nitrogen atmosphere with increased hole/electron mobilities up to 6.5/0.48 cm² V^–1 s^–1 and 7.9/0.79 cm² V^–1 s^–1, respectively.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1439556

Journal Information:: Chemistry of Materials, Vol. 30, Issue 9; ISSN 0897-4756

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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