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Energy level alignment in TiO2/metal sulfide/polymer interfaces for solar cell applications.
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2014 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 16, no 32, p. 17099-107Article in journal (Refereed) Published
Abstract [en]

Semiconductor sensitized solar cell interfaces have been studied with photoelectron spectroscopy to understand the interfacial electronic structures. In particular, the experimental energy level alignment has been determined for complete TiO2/metal sulfide/polymer interfaces. For the metal sulfides CdS, Sb2S3 and Bi2S3 deposited from single source metal xanthate precursors, it was shown that both driving forces for electron injection into TiO2 and hole transfer to the polymer decrease for narrower bandgaps. The energy level alignment results were used in the discussion of the function of solar cells with the same metal sulfides as light absorbers. For example Sb2S3 showed the most favourable energy level alignment with 0.3 eV driving force for electron injection and 0.4 eV driving force for hole transfer and also the most efficient solar cells due to high photocurrent generation. The energy level alignment of the TiO2/Bi2S3 interface on the other hand showed no driving force for electron injection to TiO2, and the performance of the corresponding solar cell was very low.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2014. Vol. 16, no 32, p. 17099-107
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Physical Sciences Chemical Sciences
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URN: urn:nbn:se:kth:diva-225441DOI: 10.1039/c4cp01581aISI: 000340353000025PubMedID: 25007378Scopus ID: 2-s2.0-84904766955OAI: oai:DiVA.org:kth-225441DiVA, id: diva2:1195414
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Swedish Energy AgencySwedish Research Council, 20124721Available from: 2018-04-05 Created: 2018-04-05 Last updated: 2018-04-16Bibliographically approved

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Cappel, Ute B
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