The study on the transport efficiency of effective excitons and relationship with the thickness of active materials
XI XI1,2,3,
XIAOJING CHEN2,
GUILIUN LIU1,3,
YING GUO3,1,
GUOHUA LI1,3,*
Affiliation
- School of Science, Jiangnan University, 1800 Lihu Ave., Wuxi, China, 214122
- Suntech Power Co., Ltd., 12 Xinhua Road, Wuxi, China, 214028
- Jiangsu (Suntech) Institute for Photovoltaic Technology, 12 Xinhua Road, Wuxi, China, 214028
Abstract
Organic solar cells are attracting a great deal of attention now. However, the academic system of organic solar cells is still
not so perfect. Most analysis of exciton recombination was still on the qualitative process. In this paper, a concept of effective
exciton transport efficiency was given, based on the generation rate of effective excitons. Using this method, the error
between the simulation of effective exciton generation rate and practical experiments was explained more clearly. With the
increase of the active layers’ thicknesses, the electrode interface would leave farther away from the effective exciton
generation region. This made less influence of electrode interface to the effective excitons, and the transport efficiency
increased. Although this decreased the effective exciton generation rate a little, the performances of cells still can get better.
The transport efficiency also can explain the function of electrode buffer layers, as well as the superiority of C70 acceptor to
that of C60..
Keywords
Organic Solar Cells, Effective Excitons, Transport Efficiency, Recombination.
Citation
XI XI, XIAOJING CHEN, GUILIUN LIU, YING GUO, GUOHUA LI, The study on the transport efficiency of effective excitons and relationship with the thickness of active materials, Optoelectronics and Advanced Materials - Rapid Communications, 9, 11-12, November-December 2015, pp.1369-1374 (2015).
Submitted at: Nov. 4, 2014
Accepted at: Oct. 28, 2015