TY - JOUR
T1 - Propeller-Shaped Acceptors for High-Performance Non-Fullerene Solar Cells
T2 - Importance of the Rigidity of Molecular Geometry
AU - Wu, Qinghe
AU - Zhao, Donglin
AU - Yang, Jinghui
AU - Sharapov, Valerii
AU - Cai, Zhengxu
AU - Li, Lianwei
AU - Zhang, Na
AU - Neshchadin, Andriy
AU - Chen, Wei
AU - Yu, Luping
N1 - Publisher Copyright:
© 2017 American Chemical Society.
PY - 2017/2/14
Y1 - 2017/2/14
N2 - This paper describes the synthesis and application of βTPB6 and βTPB6-C as electron acceptors for organic solar cells. Compound βTPB6 contains four covalently bonded PDIs with a BDT-Th core at the β-position. The free rotation of PDIs renders βTPB6 with varying molecular geometries. The cyclization of βTPB6 yields βTPB6-C with high rigidity of the molecular geometry and enlarged conjugated skeleton. The inverted solar cells based on βTPB6-C and PTB7-Th as the donor polymer exhibited the highest efficiency of 7.69% with Voc of 0.92 V, Jsc of 14.9 mAcm-2, and FF of 0.56, which is 31% higher than that for βTPB6 based devices. The larger fraction of βTPB6-C and PTB7-Th than that of βTPB6:PTB7-Th in a blend film takes a face-on orientation packing pattern for π-systems that benefits the charge transport and hence higher PCE value than that for βTPB6:PTB7-Th. It was also found that a proper DIO:DPE additive further enhances this trend, which results in an increase of the PCE value for βTPB6-C:PTB7-Th while decreasing the PCE value for βTPB6:PTB7-Th.
AB - This paper describes the synthesis and application of βTPB6 and βTPB6-C as electron acceptors for organic solar cells. Compound βTPB6 contains four covalently bonded PDIs with a BDT-Th core at the β-position. The free rotation of PDIs renders βTPB6 with varying molecular geometries. The cyclization of βTPB6 yields βTPB6-C with high rigidity of the molecular geometry and enlarged conjugated skeleton. The inverted solar cells based on βTPB6-C and PTB7-Th as the donor polymer exhibited the highest efficiency of 7.69% with Voc of 0.92 V, Jsc of 14.9 mAcm-2, and FF of 0.56, which is 31% higher than that for βTPB6 based devices. The larger fraction of βTPB6-C and PTB7-Th than that of βTPB6:PTB7-Th in a blend film takes a face-on orientation packing pattern for π-systems that benefits the charge transport and hence higher PCE value than that for βTPB6:PTB7-Th. It was also found that a proper DIO:DPE additive further enhances this trend, which results in an increase of the PCE value for βTPB6-C:PTB7-Th while decreasing the PCE value for βTPB6:PTB7-Th.
UR - http://www.scopus.com/inward/record.url?scp=85012898665&partnerID=8YFLogxK
U2 - 10.1021/acs.chemmater.6b04287
DO - 10.1021/acs.chemmater.6b04287
M3 - Article
AN - SCOPUS:85012898665
SN - 0897-4756
VL - 29
SP - 1127
EP - 1133
JO - Chemistry of Materials
JF - Chemistry of Materials
IS - 3
ER -