Side Chain Engineering of Copolymers Based on Bithiazole and Benzodithiophene for Enhanced Photovoltaic Performance

被引：85

作者：

Shi, Qinqin ^{[1
,2
,3
]}

Fan, Haijun ^{[1
,2
,3
]}

Liu, Yao ^{[1
,2
,3
]}

Chen, Jianming ^{[1
,2
,3
]}

Ma, Lanchao ^{[1
,2
,3
]}

Hu, Wenping ^{[1
,2
]}

Shuai, Zhigang ^{[1
,2
]}

Li, Yongfang ^{[1
,2
]}

Zhan, Xiaowei ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China

[2] Chinese Acad Sci, CAS Key Lab Organ Solids, Inst Chem, Beijing 100190, Peoples R China

[3] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

来源：

MACROMOLECULES | 2011年 / 44卷 / 11期

关键词：

HETEROJUNCTION SOLAR-CELLS; FIELD-EFFECT TRANSISTORS; DONOR-ACCEPTOR POLYMERS; CONJUGATED POLYMERS; BAND-GAP; POLYCYCLIC AROMATICS; ENERGY-LEVEL; CYCLOPENTADITHIOPHENE; UNITS; BENZOTHIADIAZOLE;

D O I：

10.1021/ma200576y

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Four new copolymers P1-P4 containing the same backbone of bithiazole acceptor unit and benzodithiophene donor unit but different side chain pattern were synthesized by Pd-catalyzed Stille coupling. The effect of the side chains on backbone conformation, solubility, absorption spectra, energy levels, charge transport, blend film morphology, and photovoltaic properties of the polymers were experimentally and theoretically investigated. The planarity of the main chain increases in the order P3 < P4 < P1 approximate to P2. Upon increasing the planarity of the main chain, the polymer exhibits red-shifting of absorption maximum in film from 448 to 544 nm, upshifting of HOMO from -6.0 to -5.4 eV, downshifting of LUMO from -2.6 to -2.9 eV, and increasing of hole mobility from 4.7 x 10(-4) to 0.06 cm(2) V-1 s(-1). Upon increasing the planarity of the polymer main chain, the phase separation size in polymer:PC71BM blend increases. The polymer solar cells based on P4:PC71BM (1:1, w/w) exhibit highest power conversion efficiency of 2.54% under AM 1.5, 100 mW cm(-2), which is attributed to combination of broad absorption, high mobility, and suitable phase separation benefited from moderate planarity of the main chain.

引用

页码：4230 / 4240

页数：11

共 62 条

[21] Tuning Polythiophene Crystallization through Systematic Side Chain Functionalization [J].