Disodium edetate as a promising interfacial material for inverted organic solar cells and the device performance optimization.
Disodium edetate (EDTA-Na), a popular hexadentate ligand in analytical chemistry, was successfully introduced in organic solar cells (OSCs) as cathode interfacial layer. The inverted OSCs with EDTA-Na showed superior performance both in power conversion efficiency and devices stability compared with conventional devices. Interestingly, we found that the performance of devices with EDTA-Na could be optimized through external bias treatment. After optimization, the efficiency of inverted OSCs with device structure of ITO/EDTA-Na/polymer thieno[3,4-b]thiophene/benzodithiophene (PTB7):PC71BM/MoO3/Al was significantly increased to 8.33% from an initial value of 6.75%. This work introduces a new class of interlayer materials, small molecule electrolytes, for organic solar cells.
Ningbo Institute of Materials and Technology and Engineering, Chinese Academy of Sciences , Ningbo 315201, China.
Xiaodong
X
Li
Wenjun
W
Zhang
Xueyan
X
Wang
Feng
F
Gao
Junfeng
J
Fang
external bias; interlayer; organic solar cells; small molecule electrolytes