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Chemical and Physical Reduction of High Valence Ni States in Mesoporous NiO Film for Solar Cell Application
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2017 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 9, no 39, p. 33470-33477Article in journal (Refereed) Published
Description
Abstract [en]

The most common material for dye-sensitized photocathodes is mesoporous NiO. We transformed the usual brownish NiO to be more transparent by reducing high valence Ni impurities. Two pretreatment methods have been used: chemical reduction by NaBH4 and thermal reduction by heating. The power conversion efficiency of the cell was increased by 33% through chemical treatment, and an increase in open-circuit voltage from 105 to 225 mV was obtained upon heat treatment. By optical spectroelectrochemistry, we could identify two species with characteristically different spectra assigned to Ni3+ and Ni4+. We suggest that the reduction of surface Ni3+ and Ni (4+) to Ni (2+) decreases the recombination reaction between holes on the NiO surface with the electrolyte. It also keeps the dye firmly on the surface, building a barrier for electrolyte recombination. This causes an increase in open-circuit photovoltage for the treated film.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2017. Vol. 9, no 39, p. 33470-33477
Keywords [en]
p-type, dye-sensitized solar cell, characterization, hole UV-vis spectrum, photovoltage, recombination
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-217040DOI: 10.1021/acsami.7b01532ISI: 000412717600014PubMedID: 28368109OAI: oai:DiVA.org:kth-217040DiVA, id: diva2:1159958
Note

QC 20171124

Available from: 2017-11-24 Created: 2017-11-24 Last updated: 2018-04-05Bibliographically approved

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Boschloo, GerritSun, LichengTian, Haining

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Cappel, Ute B.Gibson, Elizabeth A.Boschloo, GerritSun, LichengTian, Haining
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