TY - JOUR
T1 - Enhancing the performance of non-fullerene organic solar cells via end group engineering of fused-ring electron acceptors
AU - Yan, Cenqi
AU - Wang, Wei
AU - Lau, Tsz Ki
AU - Li, Kejia
AU - Wang, Jiayu
AU - Liu, Kuan
AU - Lu, Xinhui
AU - Zhan, Xiaowei
N1 - Funding Information:
X. Z. acknowledges support from the National Natural Science Foundation of China (Grant No. 21734001 and 51761165023). X. L. acknowledges NSFC/RGC Joint Research Scheme (No. N_CUHK418/17), Research Grant Council of Hong Kong (General Research Fund No. 14314216) and the beam time and technical support provided by 14B1 and 19U2 beamlines at SSRF, Shanghai.
Publisher Copyright:
© 2018 The Royal Society of Chemistry.
PY - 2018/7
Y1 - 2018/7
N2 - A fused heptacyclic electron acceptor, ITIC5, based on a benzodi(cyclopentadithiophene) core flanked by thiophene-fused termini, is designed, synthesized, and compared with its benzene-fused analogue, ITIC1. ITIC5 with thiophene-fused termini exhibits a narrower optical band gap, stronger and redshifted absorption, and higher electron mobility than ITIC1. The active layer consisting of a wide-bandgap polymer donor J71 and ITIC5 exhibits a smaller acceptor domain, stronger crystallinity, and higher and more balanced mobilities than its J71:ITIC1 counterpart, contributing to efficient exciton dissociation and charge transport. J71:ITIC5 based organic solar cells exhibit a high fill factor of 75.5% and a champion power conversion efficiency of 12.5%, a nearly 40% boost in efficiency with respect to the ITIC1-based control device, suggesting that the thiophene-fused end group has great potential for constructing high-performance fused-ring electron acceptors.
AB - A fused heptacyclic electron acceptor, ITIC5, based on a benzodi(cyclopentadithiophene) core flanked by thiophene-fused termini, is designed, synthesized, and compared with its benzene-fused analogue, ITIC1. ITIC5 with thiophene-fused termini exhibits a narrower optical band gap, stronger and redshifted absorption, and higher electron mobility than ITIC1. The active layer consisting of a wide-bandgap polymer donor J71 and ITIC5 exhibits a smaller acceptor domain, stronger crystallinity, and higher and more balanced mobilities than its J71:ITIC1 counterpart, contributing to efficient exciton dissociation and charge transport. J71:ITIC5 based organic solar cells exhibit a high fill factor of 75.5% and a champion power conversion efficiency of 12.5%, a nearly 40% boost in efficiency with respect to the ITIC1-based control device, suggesting that the thiophene-fused end group has great potential for constructing high-performance fused-ring electron acceptors.
UR - http://www.scopus.com/inward/record.url?scp=85052686066&partnerID=8YFLogxK
U2 - 10.1039/c8ta05800h
DO - 10.1039/c8ta05800h
M3 - Journal article
AN - SCOPUS:85052686066
SN - 2050-7488
VL - 6
SP - 16638
EP - 16644
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
IS - 34
ER -
