Journal
CHEMICAL PHYSICS
Volume 476, Issue -, Pages 29-35Publisher
ELSEVIER
DOI: 10.1016/j.chemphys.2016.07.017
Keywords
Spectroelectrochemistry; Active layer; Phase structure; Donor-acceptor interface; Charge behavior
Funding
- Basic and Frontier Research Program of Chongqing Municipality [cstc2016jcyjA1959, cstc2015jcyjA90020]
- Science and Technology Research Project of Chongqing Municipal Education Commission of China [KJ1501116]
- Introduction of Talent Project of Chongqing University of Arts and Sciences [R2014CJ05, R2012CH09, Y2015XC26]
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To investigate the correlation between morphology of active layer and performance of polymer solar cells (PSCs). Poly(3-hexylthiophene):[6,6]-phenyl-C-61-butyric acid methyl ester (P3HT:PCBM) were selected as research object and five PSCs based on active layers with varied morphology were fabricated. The results showed that P3HT crystalline phase and donor-acceptor (D-A) interface had an important influence on PSCs performance, which was revealed by structure characterization and J-V measurement. To further understanding the effect of phase structure and D-A interface on charge behavior. Spectroelectrochemistry measurement (SEC) was performed to characterize the steady-state optical absorption of P3HT, PCBM cation and anion in varied active layers, and the spectra difference of cations and anions was analyzed. The results were found that D-A interface could promote charge generation. P3HT crystalline phase and PCBM aggregation phase were beneficial for improving the charge transport ability. Meanwhile, the non-equilibrium transport of electron and hole in PSCs was corroborated by SEC. (C) 2016 Elsevier B.V. All rights reserved.
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