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Temperature and Light Modulated Open‐Circuit Voltage in Nonfullerene Organic Solar Cells with Different Effective Bandgaps
Author(s) -
Brus Viktor V.,
Schopp Nora,
Ko SeoJin,
Vollbrecht Joachim,
Lee Jaewon,
Karki Akchheta,
Bazan Guillermo C.,
Nguyen ThucQuyen
Publication year - 2021
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.202003091
Subject(s) - materials science , open circuit voltage , organic solar cell , optoelectronics , acceptor , recombination , band gap , dielectric spectroscopy , light intensity , voltage , electrode , solar cell , chemical physics , optics , condensed matter physics , chemistry , physics , composite material , quantum mechanics , electrochemistry , gene , polymer , biochemistry
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,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 σ 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.