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Achieving High Open-Circuit Voltages up to 1.57 V in Hole-Transport-Material-Free MAPbBr(3) Solar Cells with Carbon Electrodes
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2018 (English)In: Advanced Energy Materials, ISSN 1614-6832, Vol. 8, no 4, article id 1701159Article in journal (Refereed) Published
Abstract [en]

An open-circuit voltage (V-oc) of 1.57 V under simulated AM1.5 sunlight in planar MAPbBr(3) solar cells with carbon (graphite) electrodes is obtained. The hole-transport-material-free MAPbBr(3) solar cells with the normal architecture (FTO/TiO2/MAPbBr(3)/carbon) show little hysteresis during current-voltage sweep under simulated AM1.5 sunlight. A solar-to-electricity power conversion efficiency of 8.70% is achieved with the champion device. Accordingly, it is proposed that the carbon electrodes are effective to extract photogenerated holes in MAPbBr(3) solar cells, and the industry-applicable carbon electrodes will not limit the performance of bromide-based perovskite solar cells. Based on the analysis of the band alignment, it is found that the voltage (energy) loss across the interface between MAPbBr(3) and carbon is very small compared to the offset between the valence band maximum of MAPbBr(3) and the work function of graphite. This finding implies either Fermi level pinning or highly doped region inside MAPbBr(3) layer exists. The band-edge electroluminescence spectra of MAPbBr(3) from the solar cells further support no back-transfer pathways of electrons across the MAPbBr(3)/TiO2 interface.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2018. Vol. 8, no 4, article id 1701159
Keywords [en]
band alignment, carbon electrodes, hybrid solar cells, open-circuit voltage, radiative limit
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-223263DOI: 10.1002/aenm.201701159ISI: 000424152200002Scopus ID: 2-s2.0-85030117470OAI: oai:DiVA.org:kth-223263DiVA, id: diva2:1183841
Funder
Swedish Energy AgencyKnut and Alice Wallenberg Foundation
Note

QC 20180219

Available from: 2018-02-19 Created: 2018-02-19 Last updated: 2018-02-19Bibliographically approved

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