TY - JOUR
T1 - New roles of fused-ring electron acceptors in organic solar cells
AU - Cao, Huan
AU - Qin, Dashan
AU - Wang, Jing
AU - Li, Tengfei
AU - Zhu, Jingshuai
AU - Jiang, Haotian
AU - Zhang, Mingyu
AU - Liu, Kuan
AU - Tang, Zheng
AU - Zhan, Xiaowei
N1 - Funding Information:
X. Z. thanks the National Natural Science Foundation of China (Grant No. 21734001 and 51761165023).
Publisher Copyright:
© 2019 The Royal Society of Chemistry.
PY - 2019/1
Y1 - 2019/1
N2 - Recently, we developed fused-ring electron acceptors (FREAs) as a class of high-performance nonfullerene acceptors, which have been widely used in organic solar cells (OSCs). Here, we explore new functions of FREAs in addition to being an acceptor in a photoactive layer, and use them as an interfacial layer, which significantly improves the performance of OSCs. Compared with the conventional cathode modifying layers (CMLs) of ZnO and ZnO/polyethylenimine ethoxylated (PEIE), a novel CML of ZnO/FREA/PEIE enhances the optical mode and absorption of the device and suppresses geminate recombination via charge separation, both of which increase the short-circuit current density. In addition, FREAs passivate the surface defects of ZnO and then facilitate electron transport. The OSCs based on ZnO/FREA/PEIE exhibit a power conversion efficiency of 13.04%, higher than those based on ZnO and ZnO/PEIE (12.15% and 12.12%).
AB - Recently, we developed fused-ring electron acceptors (FREAs) as a class of high-performance nonfullerene acceptors, which have been widely used in organic solar cells (OSCs). Here, we explore new functions of FREAs in addition to being an acceptor in a photoactive layer, and use them as an interfacial layer, which significantly improves the performance of OSCs. Compared with the conventional cathode modifying layers (CMLs) of ZnO and ZnO/polyethylenimine ethoxylated (PEIE), a novel CML of ZnO/FREA/PEIE enhances the optical mode and absorption of the device and suppresses geminate recombination via charge separation, both of which increase the short-circuit current density. In addition, FREAs passivate the surface defects of ZnO and then facilitate electron transport. The OSCs based on ZnO/FREA/PEIE exhibit a power conversion efficiency of 13.04%, higher than those based on ZnO and ZnO/PEIE (12.15% and 12.12%).
UR - http://www.scopus.com/inward/record.url?scp=85062290370&partnerID=8YFLogxK
U2 - 10.1039/c8ta12398e
DO - 10.1039/c8ta12398e
M3 - Journal article
AN - SCOPUS:85062290370
SN - 2050-7488
VL - 7
SP - 4766
EP - 4770
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
IS - 9
ER -
