Disodium edetate as a promising interfacial material for inverted organic solar cells and the device performance optimization

Xiaodong Li; Wenjun Zhang; Xueyan Wang; Feng Gao; Junfeng Fang

doi:10.1021/am5044278

Disodium edetate as a promising interfacial material for inverted organic solar cells and the device performance optimization

ACS Appl Mater Interfaces. 2014 Dec 10;6(23):20569-73. doi: 10.1021/am5044278. Epub 2014 Nov 26.

Authors

Xiaodong Li¹, Wenjun Zhang, Xueyan Wang, Feng Gao, Junfeng Fang

Affiliation

¹ Ningbo Institute of Materials and Technology and Engineering, Chinese Academy of Sciences , Ningbo 315201, China.

PMID: 25402413
DOI: 10.1021/am5044278

Abstract

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.

Keywords: external bias; interlayer; organic solar cells; small molecule electrolytes.

Publication types

Letter
Research Support, Non-U.S. Gov't