TY - JOUR
T1 - Selenium-Containing Medium Bandgap Copolymer for Bulk Heterojunction Polymer Solar Cells with High Efficiency of 9.8%
AU - Xu, Zhuo
AU - Fan, Qunping
AU - Meng, Xiangyi
AU - Guo, Xia
AU - Su, Wenyan
AU - Ma, Wei
AU - Zhang, Maojie
AU - Li, Yongfang
N1 - Publisher Copyright:
© 2017 American Chemical Society.
PY - 2017/6/13
Y1 - 2017/6/13
N2 - In this work, a new D-A copolymer based on m-alkoxyphenyl substituted benzodithiophene (BDT-m-OP) as donor unit and benzo[1,2-c:4,5-c′]dithiophene-4,8-dione (BDD) as acceptor unit was designed and synthesized, in which selenophene unit as π-conjugated spacer was incorporated into the polymer backbone to broaden the absorption spectrum, enhance the charge transport properties, and even improve the photovoltaic properties. Compared with PBPD-Th with thiophene as π-conjugated spacer, PBPD-Se exhibits an evidently extended absorption spectrum and an enhanced hole mobility with a slightly raised HOMO energy level. The PBPD-Se:PC71BM-based PSCs exhibits a significantly improved PCE of 9.8% with an enhanced Jsc of 14.9 mA cm-2 and a slightly lower Voc of 0.90 V in comparison with a PCE of 8.4% with a Voc of 0.95 V and a Jsc of 12.4 mA cm-2 for PBPD-Th:PC71BM-based devices. These results indicate that the rational selection of π-conjugated spacer in the D-A copolymer backbone is very essential to achieve high efficiency PSCs.
AB - In this work, a new D-A copolymer based on m-alkoxyphenyl substituted benzodithiophene (BDT-m-OP) as donor unit and benzo[1,2-c:4,5-c′]dithiophene-4,8-dione (BDD) as acceptor unit was designed and synthesized, in which selenophene unit as π-conjugated spacer was incorporated into the polymer backbone to broaden the absorption spectrum, enhance the charge transport properties, and even improve the photovoltaic properties. Compared with PBPD-Th with thiophene as π-conjugated spacer, PBPD-Se exhibits an evidently extended absorption spectrum and an enhanced hole mobility with a slightly raised HOMO energy level. The PBPD-Se:PC71BM-based PSCs exhibits a significantly improved PCE of 9.8% with an enhanced Jsc of 14.9 mA cm-2 and a slightly lower Voc of 0.90 V in comparison with a PCE of 8.4% with a Voc of 0.95 V and a Jsc of 12.4 mA cm-2 for PBPD-Th:PC71BM-based devices. These results indicate that the rational selection of π-conjugated spacer in the D-A copolymer backbone is very essential to achieve high efficiency PSCs.
UR - https://www.scopus.com/pages/publications/85020732691
U2 - 10.1021/acs.chemmater.7b00729
DO - 10.1021/acs.chemmater.7b00729
M3 - 文章
AN - SCOPUS:85020732691
SN - 0897-4756
VL - 29
SP - 4811
EP - 4818
JO - Chemistry of Materials
JF - Chemistry of Materials
IS - 11
ER -
