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Achieving Balanced Crystallization Kinetics of Donor and Acceptor by Sequential‐Blade Coated Double Bulk Heterojunction Organic Solar Cells.

Authors :
Wang, Yilin
Wang, Xiaohui
Lin, Baojun
Bi, Zhaozhao
Zhou, Xiaobo
Naveed, Hafiz Bilal
Zhou, Ke
Yan, Hongping
Tang, Zheng
Ma, Wei
Source :
Advanced Energy Materials; 7/28/2020, Vol. 10 Issue 28, p1-9, 9p
Publication Year :
2020

Abstract

Sequential deposition has great potential to achieve high performance in organic solar cells due to the resulting well‐controlled vertical phase separation. In this work, double bulk heterojunction organic solar cells are fabricated by sequential‐blade cast in ambient conditions. Probed by the in situ grazing incidence X‐ray diffraction and in situ UV–vis absorption measurements, the seq‐blade system exhibits a different tendency from each of the binary films during the film formation process. Due to the extensive aggregation of FOIC, the binary PBDB‐T:FOIC film displays a strong and large phase separation, resulting in low current density (Jsc) and unsatisfactory power conversion efficiency. In the seq‐blade cast system, the bottom layer PBDB‐T:IT‐M produces many crystal nuclei for the top layer PBDB‐T:FOIC, so the PBDB‐T molecules are able to crystallize easily and quickly. Balanced crystallization kinetics between polymer and small molecule and an ideal percolation network in the film are observed. In addition, the balanced crystallization kinetics are favorable toward realizing lower recombination loss through charge transport processes. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
16146832
Volume :
10
Issue :
28
Database :
Complementary Index
Journal :
Advanced Energy Materials
Publication Type :
Academic Journal
Accession number :
144804091
Full Text :
https://doi.org/10.1002/aenm.202000826