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π‐Extented Conjugated Polymers Entailing Pechmann Dye Moieties for Solution‐Processed Ambipolar Organic Semiconductors
Author(s) -
Cai Zhengxu,
Liu Zitong,
Luo Hewei,
Qi Penglin,
Zhang Guanxin,
Zhang Deqing
Publication year - 2014
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201400423
Subject(s) - ambipolar diffusion , chemistry , conjugated system , organic semiconductor , electron mobility , polymer , alkyl , semiconductor , annealing (glass) , polymer chemistry , photochemistry , electron , optoelectronics , organic chemistry , materials science , physics , quantum mechanics , composite material
In this paper, we report the design, synthesis and semiconducting behavior of two conjugated D‐A polymers BPDDTE and BPDBDTE which entail BPD, a Pechmann dye framework, as electron accepting moieties and ( E )‐1,2‐di(thiophen‐2‐yl)ethane with and without alkyl chains as electron donating moieties. They both show very narrow bandgaps below 1.3 eV. Based on the characterization of the field‐effect transistors, thin film of BPDDT exhibits ambipolar semiconducting properties with hole and electron mobilities reaching 0.245 and 0.095 cm 2 ·V 1 ·s −1 , respectively, after thermal annealing. Similarly, BPDBDTE with more alkylchains shows ambipolar semiconducting behavior with hole mobility and electron mobilities reaching 0.109 and 0.081 cm 2 ·V −1 ·s −1 . Furthermore, BPDBDTE shows good solubilities in several common organic solvents and thus is easily solution‐processible. Thus, BPDBDTE is potentially processible with inkjet printing and roll‐to‐roll printing techniques.