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Electric Field and Mobility Dependent First-Order Recombination Losses in Organic Solar Cells

Martin Stolterfoht, Safa Shoaee, Ardalan Armin Orcid Logo, Hui Jin, Ivan Kassal, Wei Jiang, Paul Burn, Paul Meredith Orcid Logo

Advanced Energy Materials, Volume: 7, Issue: 4, Start page: 1601379

Swansea University Authors: Ardalan Armin Orcid Logo, Paul Meredith Orcid Logo

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DOI (Published version): 10.1002/aenm.201601379

Abstract

The origin of photocurrent losses in the power-generating regime of organic solar cells (OSCs) remains a controversial topic, although recent literature suggests that the competition between bimolecular recombination and charge extraction determines the bias dependence of the photocurrent. Here we s...

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Published in: Advanced Energy Materials
ISSN: 16146832
Published: 2017
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa38542
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Abstract: The origin of photocurrent losses in the power-generating regime of organic solar cells (OSCs) remains a controversial topic, although recent literature suggests that the competition between bimolecular recombination and charge extraction determines the bias dependence of the photocurrent. Here we studied the steady-state recombination dynamics in bulk-heterojunction OSCs with different hole mobilities from short-circuit to maximum power point. We show that in this regime, in contrast to previous transient extracted charge and absorption spectroscopy studies, first-order recombination outweighs bimolecular recombination of photo-generated charge carriers. We demonstrate that the first-order losses increase with decreasing slower carrier mobility, and attribute them to either mobilization of charges trapped at the donor:acceptor interface through the Poole-Frenkel effect, and/or recombination of photogenerated and injected charges. The dependence of both first-order and higher-order losses on the slower carrier mobility explains why the field dependence of OSC efficiencies are historically to charge-extraction losses.
College: College of Science
Issue: 4
Start Page: 1601379