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- Title
Electric Field and Mobility Dependent First-Order Recombination Losses in Organic Solar Cells.
- Authors
Stolterfoht, Martin; Shoaee, Safa; Armin, Ardalan; Jin, Hui; Kassal, Ivan; Jiang, Wei; Burn, Paul; Meredith, Paul
- 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 the steady-state recombination dynamics is studied in bulk-heterojunction OSCs with different hole mobilities from short-circuit to maximum power point. It is shown that in this regime, in contrast to previous transient extracted charge and absorption spectroscopy studies, first-order recombination outweighs bimolecular recombination of photogenerated charge carriers. This study demonstrates that the first-order losses increase with decreasing slower carrier mobility, and attributes 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 has historically been attributed to charge-extraction losses.
- Subjects
SOLAR cells; ELECTRIC fields; HETEROJUNCTIONS; ION recombination; ABSORPTION spectra; SHORT circuits; CHARGE carrier mobility
- Publication
Advanced Energy Materials, 2017, Vol 7, Issue 4, pn/a
- ISSN
1614-6832
- Publication type
Article
- DOI
10.1002/aenm.201601379