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Electric Field and Mobility Dependent First-Order Recombination Losses in Organic Solar Cells / Martin Stolterfoht, Safa Shoaee, Ardalan Armin, Hui Jin, Ivan Kassal, Wei Jiang, Paul Burn, Paul Meredith

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

Swansea University Authors: Ardalan Armin, Paul Meredith

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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