A New Figure of Merit for Organic Solar Cells with Transport-limited Photocurrents
- Compared to their inorganic counterparts, organic semiconductors suffer from relatively low charge carrier mobilities. Therefore, expressions derived for inorganic solar cells to correlate characteristic performance parameters to material properties are prone to fail when applied to organic devices. This is especially true for the classical Shockley-equation commonly used to describe current-voltage (JV)-curves, as it assumes a high electrical conductivity of the charge transporting material. Here, an analytical expression for the JV-curves of organic solar cells is derived based on a previously published analytical model. This expression, bearing a similar functional dependence as the Shockley-equation, delivers a new figure of merit a to express the balance between free charge recombination and extraction in low mobility photoactive materials. This figure of merit is shown to determine critical device parameters such as the apparent series resistance and the fill factor.
Author details: | Dieter NeherORCiDGND, Juliane Kniepert, Arik Elimelech, L. Jan Anton Koster |
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DOI: | https://doi.org/10.1038/srep24861 |
ISSN: | 2045-2322 |
Pubmed ID: | https://pubmed.ncbi.nlm.nih.gov/27112905 |
Title of parent work (English): | Scientific reports |
Publisher: | Nature Publ. Group |
Place of publishing: | London |
Publication type: | Article |
Language: | English |
Year of first publication: | 2016 |
Publication year: | 2016 |
Release date: | 2020/03/22 |
Volume: | 6 |
Number of pages: | 9 |
First page: | E2348 |
Last Page: | E2349 |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
Peer review: | Referiert |