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Charge transport study of perovskite solar cells through constructing electron transport channels
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2017 (English)In: Physica Status Solidi (a) applications and materials science, ISSN 1862-6300, E-ISSN 1862-6319, Vol. 214, no 10, article id 1700089Article in journal (Refereed) Published
Abstract [en]

Perovskite solar cells (PSC) have attracted much attention in the recent years. It is important to understand their working principle in order to uncover the reasons behind their high efficiency. In this study, the carrier transport mechanism of PSC by controlling the structure of a scaffold is investigated. CeO2 is used as an electron blocking material in PSCs to study the electron transport behavior for the first time. The influence of light absorption can be excluded because CeO2 has a similar bandgap to TiO2. A variety of scaffolds are constructed using nano-TiO2 and CeO2. The results show that electrons can transport from light absober (perovskite) to FTO electrode (external circuit) through two kinds of channels. The energy band level, as well as the electronic conductivity of the scaffolds, is are key issues that affect electron transport. Although perovskites are able to transport both electrons and holes, it is still necessary to have effective electron transport channels (ETCs) between perovskite and external circuit for the sake of high efficiency. Electrochemical impedance spectroscopy analysis suggests that the lack of such channels will result in high recombination. The number of ETCs and effecient electron-hole separation are also proven to be important for cell performance.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2017. Vol. 214, no 10, article id 1700089
Keywords [en]
CeO2, electron blocking, electron transport, perovskites, scaffolds, solar cells
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-217196DOI: 10.1002/pssa.201700089ISI: 000412823000013Scopus ID: 2-s2.0-85023639906OAI: oai:DiVA.org:kth-217196DiVA, id: diva2:1154607
Note

QC 20171103

Available from: 2017-11-03 Created: 2017-11-03 Last updated: 2017-11-03Bibliographically approved

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CiteExportLink to record
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  • apa
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Output format
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