Power-law density of states in organic solar cells revealed by the open-circuit voltage dependence of the ideality factor

The density of states (DOS) is fundamentally important for understanding physical processes in organic disordered semiconductors, yet hard to determine experimentally. We evaluated the DOS by considering recombination via tail states and using the temperature and open-circuit voltage (\(V_\mathrm{oc...

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Bibliographic Details
Published in:arXiv.org 2022-10
Main Authors: Saladina, Maria, Wöpke, Christopher, Göhler, Clemens, Ramirez, Ivan, Gerdes, Olga, Liu, Chao, Li, Ning, Heumüller, Thomas, Brabec, Christoph J, Walzer, Karsten, Pfeiffer, Martin, Deibel, Carsten
Format: Article
Language:English
Subjects:
Density of states
Open circuit voltage
Organic semiconductors
Photovoltaic cells
Power law
Solar cells
Online Access:Get full text
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Summary:The density of states (DOS) is fundamentally important for understanding physical processes in organic disordered semiconductors, yet hard to determine experimentally. We evaluated the DOS by considering recombination via tail states and using the temperature and open-circuit voltage (\(V_\mathrm{oc}\)) dependence of the ideality factor in organic solar cells. By performing Suns-\(V_\mathrm{oc}\) measurements, we find that gaussian and exponential distributions describe the DOS only at a given quasi-Fermi level splitting. The DOS width increases linearly with the DOS depth, revealing the power-law DOS in these materials.
ISSN:2331-8422
DOI:10.48550/arxiv.2210.11208