期刊
ADVANCED ENERGY MATERIALS
卷 11, 期 4, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202003091
关键词
charge recombination; open‐ circuit voltage– light intensity; organic solar cells; temperature
类别
资金
- Department of the Navy, Office of Naval Research Award [N00014-14-1-0580]
- Alexander-von-Humboldt Stiftung
The relationship between the temperature-light intensity dependence of open-circuit voltage V-oc in nonfullerene-based organic solar cells and the material characteristics and multimechanism recombination parameters was investigated. By systematically varying the effective bandgap E-g, E-eff and the electrode layers, different contributions of bimolecular, bulk, and surface trap-assisted recombination mechanisms were observed. The analytical model and voltage-impedance spectroscopy technique provide a useful tool to quantify multimechanism recombination parameters, effective density of states N-c, and energetic disorder sigma in organic solar cells under operating conditions. The proposed model's validity in understanding the temperature and light intensity dependence of V-oc was demonstrated by applying it to four different donor:nonfullerene acceptor blend systems with conventional or inverted device architectures.
The relationship of the temperature-light intensity dependence of open-circuit voltage V-oc in nonfullerene-based organic solar cells with their material characteristics and multimechanism recombination parameters is described. The systematic variation of the effective bandgap E-g,E-eff and the electrode layers allows the observation of different relative contributions of bimolecular, bulk, and surface trap-assisted recombination mechanisms. The complementary advantages of the analytical model and the established voltage-impedance spectroscopy technique provide a useful tool to quantify multimechanism recombination parameters, effective density of states N-c, and energetic disorder sigma in organic solar cells under operating conditions. The validity of the proposed model to understand the temperature and light intensity dependent of V-oc is shown by applying it to four different donor:nonfullerene acceptor blend systems with conventional or inverted device architectures.
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