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Unified Model for Exciton Diffusion and Dissociation in Organic Solar Cells
Author(s) -
Xiong Chunhua,
Sun Jiuxun,
Fu Yao,
Zhang Jingye
Publication year - 2019
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201900322
Subject(s) - exciton , dissociation (chemistry) , organic solar cell , acceptor , chemical physics , biexciton , diffusion , materials science , chemistry , physics , thermodynamics , condensed matter physics , polymer , composite material
The performance of organic solar cells is limited by the exciton. However, the theoretical model to study the nature of the exciton is separated into exciton diffusion and dissociation. This article proposes a unified model by combining both exciton diffusion and dissociation. This model can be reduced to the classical model of exciton diffusion or dissociation. Moreover, this model quantitatively explains meaningful experimental data of the short‐circuit current characteristic at different active layer thicknesses that cannot be fitted by the two classical models. In sum, this model is useful for researching the mechanism of the exciton in thin organic materials, which make some significant contributions to blend, multilayer, and A–D–A small‐molecule acceptor solar cells.