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Equilibrated Charge Carrier Populations Govern Steady-State Nongeminate Recombination in Disordered Organic Solar Cells
Univ Potsdam, Germany; UP Transfer GmbH, Germany.
Univ Potsdam, Germany.
Univ Potsdam, Germany.
Eindhoven Univ Technol, Netherlands.
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2019 (English)In: Journal of Physical Chemistry Letters, ISSN 1948-7185, E-ISSN 1948-7185, Vol. 10, no 6, p. 1374-1381Article in journal (Refereed) Published
Abstract [en]

We employed bias-assisted charge extraction techniques to investigate the transient and steady-state recombination of photogenerated charge carriers in complete devices of a disordered polymer-fullerene blend. Charge recombination is shown to be dispersive, with a significant slowdown of the recombination rate over time, consistent with the results from kinetic Monte Carlo simulations. Surprisingly, our experiments reveal little to no contributions from early time recombination of nonequilibrated charge carriers to the steady-state recombination properties. We conclude that energetic relaxation of photogenerated carriers outpaces any significant nongeminate recombination under application-relevant illumination conditions. With equilibrated charges dominating the steady-state recombination, quasi-equilibrium concepts appear suited for describing the open-circuit voltage of organic solar cells despite pronounced energetic disorder.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2019. Vol. 10, no 6, p. 1374-1381
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-157256DOI: 10.1021/acs.jpclett.9b00516ISI: 000463678800033PubMedID: 30829040OAI: oai:DiVA.org:liu-157256DiVA, id: diva2:1323839
Note

Funding Agencies|German Ministry of Science and Education (BMBF) within the project UNVEIL; German Science Foundation [INST 336/94-1 FUGG, NE410/15-1]; Shell Global Solutions International B.V.; Knut and Alice Wallenberg Foundation [KAW 2016.0494]

Available from: 2019-06-12 Created: 2019-06-12 Last updated: 2019-06-12

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CiteExportLink to record
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Citation style
  • apa
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  • de-DE
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