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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 .
Linköpings universitet, Institutionen för fysik, kemi och biologi, Biomolekylär och Organisk Elektronik. Linköpings universitet, Tekniska högskolan.
Centre Phys Science and Technology, Lithuania .
Vise andre og tillknytning
2014 (engelsk)Inngår i: Journal of the American Chemical Society, ISSN 0002-7863, E-ISSN 1520-5126, Vol. 136, nr 32, s. 11331-11338Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
American Chemical Society , 2014. Vol. 136, nr 32, s. 11331-11338
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Identifikatorer
URN: urn:nbn:se:liu:diva-110480DOI: 10.1021/ja503301mISI: 000340442700029PubMedID: 25025885OAI: oai:DiVA.org:liu-110480DiVA, id: diva2:746936
Merknad

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

Tilgjengelig fra: 2014-09-15 Laget: 2014-09-12 Sist oppdatert: 2017-12-05

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