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Charge Carrier Generation and Transport in Different Stoichiometry APFO3:PC61BM Solar Cells
Centre Phys Science and Technology, Lithuania .
Lund University, Sweden .
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, The Institute of Technology.
Centre Phys Science and Technology, Lithuania .
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2014 (English)In: Journal of the American Chemical Society, ISSN 0002-7863, E-ISSN 1520-5126, Vol. 136, no 32, 11331-11338 p.Article in journal (Refereed) Published
Abstract [en]

In this paper we studied carrier drift dynamics in APFO3:PC61BM solar cells of varied stoichiometry (2:1, 1:1, and 1:4 APFO3:PC61BM) over a wide time range, from subpicoseconds to microseconds with a combination of ultrafast optical electric field probing and conventional transient integrated photocurrent techniques. Carrier drift and extraction dynamics are strongly stoichiometry dependent: the speed of electron or hole drift increases with higher concentration of PC61BM or polymer, respectively. The electron extraction from a sample with 80% PC61BM takes place during hundreds of picoseconds, but slows down to sub-microseconds in a sample with 33% PC61BM. The hole extraction is less stoichiometry dependent: it varies form sub-nanoseconds to tens of nanoseconds when the PC61BM concentration changes from 33% to 80%. The electron extraction rate correlates with the conversion efficiency of solar cells, leading to the conclusion that fast electron motion is essential for efficient charge carrier separation preventing their geminate recombination.

Place, publisher, year, edition, pages
American Chemical Society , 2014. Vol. 136, no 32, 11331-11338 p.
National Category
Industrial Biotechnology
URN: urn:nbn:se:liu:diva-110480DOI: 10.1021/ja503301mISI: 000340442700029PubMedID: 25025885OAI: diva2:746936

Funding Agencies|Swedish and European Research Councils [226136-VISCHEM]; Swedish Energy Agency; Knut and Alice Wallenberg Foundation

Available from: 2014-09-15 Created: 2014-09-12 Last updated: 2014-09-15

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Tang, ZhengInganäs, Olle
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