The role of space charge effects on the competition between recombination and extraction in solar cells with low-mobility photoactive layers

Stolterfoht, Martin, Armin, Ardalan, Philippa, Bronson and Neher, Dieter (2016) The role of space charge effects on the competition between recombination and extraction in solar cells with low-mobility photoactive layers. Journal of Physical Chemistry Letters, 7 22: 4716-4721. doi:10.1021/acs.jpclett.6b02106


Author Stolterfoht, Martin
Armin, Ardalan
Philippa, Bronson
Neher, Dieter
Title The role of space charge effects on the competition between recombination and extraction in solar cells with low-mobility photoactive layers
Journal name Journal of Physical Chemistry Letters   Check publisher's open access policy
ISSN 1948-7185
Publication date 2016-11-17
Sub-type Article (original research)
DOI 10.1021/acs.jpclett.6b02106
Open Access Status Not yet assessed
Volume 7
Issue 22
Start page 4716
End page 4721
Total pages 6
Place of publication Washington, DC, United States
Publisher American Chemical Society
Language eng
Abstract The competition between charge extraction and nongeminate recombination critically determines the current-voltage characteristics of organic solar cells (OSCs) and their fill factor. As a measure of this competition, several figures of merit (FOMs) have been put forward; however, the impact of space charge effects has been either neglected, or not specifically addressed. Here we revisit recently reported FOMs and discuss the role of space charge effects on the interplay between recombination and extraction. We find that space charge effects are the primary cause for the onset of recombination in so-called non-Langevin systems, which also depends on the slower carrier mobility and recombination coefficient. The conclusions are supported with numerical calculations and experimental results of 25 different donor/acceptor OSCs with different charge transport parameters, active layer thicknesses or composition ratios. The findings represent a conclusive understanding of bimolecular recombination for drift dominated photocurrents and allow one to minimize these losses for given device parameters.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
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