TY - JOUR
T1 - 15.3% efficiency all-small-molecule organic solar cells enabled by symmetric phenyl substitution
AU - Qin, Jinzhao
AU - An, Cunbin
AU - Zhang, Jianqi
AU - Ma, Kangcqiao
AU - Yang, Yang
AU - Zhang, Tao
AU - Li, Sunsun
AU - Xian, Kaihu
AU - Cui, Yong
AU - Tang, Yabing
AU - Ma, Wei
AU - Yao, Huifeng
AU - Zhang, Shaoqing
AU - Xu, Bowei
AU - He, Chang
AU - Hou, Jianhui
N1 - Publisher Copyright:
© 2020, Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature.
PY - 2020/7/1
Y1 - 2020/7/1
N2 - Synergistic optimization of donor-acceptor blend morphologyis a hurdle in the path of realizing efficient non-fullerene small-molecule organic solar cells (NFSM-OSCs) due to the anisotropic conjugated backbones of both donor and acceptor. Therefore, developing a facile molecular design strategy to effectively regulate the crystalline properties of photoactive materials, and thus, enable the optimization of blend morphology is of vital importance. In this study, a new donor molecule B1, comprising phenyl-substituted benzodithiophene (BDT) central unit, exhibits strong interaction with the non-fullerene acceptor BO-4Cl in comparison with its corresponding thiophene-substituted BDT-based material, BTR. As a result, the B1 is affected and induced from an edge-on to a face-on orientation by the acceptor, while the BTR and the acceptor behave individually for the similar molecular orientation in pristine and blend films according to grazing incidence wide angle X-ray scattering results. It means the donor-acceptor blend morphology is synergistically optimized in the B1 system, and the B1:BO-4Cl-based devices achieve an outstanding power conversion efficiency (PCE) of 15.3%, further certified to be 15.1% by the National Institute of Metrology, China. Our results demonstrate a simple and effective strategy to improve the crystalline properties of the donor molecule as well as synergistically optimize the morphology of the all-small-molecule system, leading to the high-performance NFSM-OSCs.
AB - Synergistic optimization of donor-acceptor blend morphologyis a hurdle in the path of realizing efficient non-fullerene small-molecule organic solar cells (NFSM-OSCs) due to the anisotropic conjugated backbones of both donor and acceptor. Therefore, developing a facile molecular design strategy to effectively regulate the crystalline properties of photoactive materials, and thus, enable the optimization of blend morphology is of vital importance. In this study, a new donor molecule B1, comprising phenyl-substituted benzodithiophene (BDT) central unit, exhibits strong interaction with the non-fullerene acceptor BO-4Cl in comparison with its corresponding thiophene-substituted BDT-based material, BTR. As a result, the B1 is affected and induced from an edge-on to a face-on orientation by the acceptor, while the BTR and the acceptor behave individually for the similar molecular orientation in pristine and blend films according to grazing incidence wide angle X-ray scattering results. It means the donor-acceptor blend morphology is synergistically optimized in the B1 system, and the B1:BO-4Cl-based devices achieve an outstanding power conversion efficiency (PCE) of 15.3%, further certified to be 15.1% by the National Institute of Metrology, China. Our results demonstrate a simple and effective strategy to improve the crystalline properties of the donor molecule as well as synergistically optimize the morphology of the all-small-molecule system, leading to the high-performance NFSM-OSCs.
KW - all-small-molecule
KW - crystallinity
KW - intermolecular interaction
KW - non-fullerene
KW - organic solar cells
UR - https://www.scopus.com/pages/publications/85082874735
U2 - 10.1007/s40843-020-1269-9
DO - 10.1007/s40843-020-1269-9
M3 - 文章
AN - SCOPUS:85082874735
SN - 2095-8226
VL - 63
SP - 1142
EP - 1150
JO - Science China Materials
JF - Science China Materials
IS - 7
ER -