Optimization of active layer morphology by small-molecule donor design enables over 15% efficiency in small-molecule organic solar cells

被引:22
作者
An, Cunbin [1 ]
Qin, Yunpeng [3 ]
Zhang, Tao [1 ]
Lv, Qianglong [1 ]
Qin, Jinzhao [1 ,2 ]
Zhang, Shaoqing [1 ]
He, Chang [1 ]
Ade, Harald [3 ]
Hou, Jianhui [1 ,2 ]
机构
[1] Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, State Key Lab Polymer Phys & Chem, Beijing 100190, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[3] North Carolina State Univ, Dept Phys, Organ & Carbon Elect Labs ORaCEL, Raleigh, NC 27695 USA
基金
中国国家自然科学基金;
关键词
INDACENODITHIOPHENE;
D O I
10.1039/d0ta12242d
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Molecular innovation is highly important to achieve highly efficient small-molecule organic solar cells (SMOSCs). Herein, we report two small-molecule donors, namely, B3T-T and B3T-P, which differ only in their conjugated side chains: the former with a thienyl group and the latter with a phenyl unit. Surprisingly, both small-molecule donors show distinct electron density distribution and electrostatic potential along the conjugated backbone. B3T-P has a much higher dipole moment (0.920 D) than that of B3T-T (0.237 D). In SMOSCs, the B3T-T:BO-4Cl-based device shows a decent power conversion efficiency (PCE) of 11.1%. In contrast, the B3T-P:BO-4Cl-based device gives an outstanding PCE of 15.2%, which is one of the highest values among SMOSCs. Compared to the B3T-P-based device, although the B3T-T-based device has a large enough driving force for exciton separation and an extremely low non-radiative recombination voltage loss (0.168 V) for achieving high open-circuit voltage, the large domain size (63 nm) and low domain purity in the B3T-T:BO-4Cl-based device results in a relatively low short-circuit current density and fill factor, thus giving a low PCE. This result may pave the way to rationally design SM donors for highly efficient SMOSCs.
引用
收藏
页码:13653 / 13660
页数:8
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