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Bismuth-Antimony mixed double perovskites Cs2AgBi1-xSbxBr6 in solar cells

Published online by Cambridge University Press:  04 November 2019

Martina Pantaler ,
Selina Olthof ,
Klaus Meerholz  and
Doru C. Lupascu
Martina Pantaler*
Affiliation:
Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE) University of Duisburg-Essen, Universitätsstraße 15, 45151Essen, Germany
Selina Olthof
Affiliation:
Department of Chemistry, University of Cologne, Luxembourger Straße 116, 50939 Köln
Klaus Meerholz
Affiliation:
Department of Chemistry, University of Cologne, Luxembourger Straße 116, 50939 Köln
Doru C. Lupascu
Affiliation:
Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE) University of Duisburg-Essen, Universitätsstraße 15, 45151Essen, Germany
*
*(Email: martina.pantaler@uni-due.de)
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Abstract

Reported conversion efficiencies of lead based perovskite solar cells keep increasing steadily. But next to the demand for high efficiency, the need for analogue non-toxic material systems remains. One promising lead free absorber material is the double perovskite Cs2AgBiBr6. Interest in this and other double perovskites has been increasing in the last three years and several solar cells using different device structures have been reported. However, the efficiency of these solar cells is merely in the range of 2%. To further improve solar cell performance we prepared mixed bismuth-antimony double perovskite Cs2AgBi1-xSbxBr6 where different fractions of antimony (x=0.125, 0.25, 0.375, 0.50) are used. This was motivated by reports of lower bandgap values in these mixed system. After the optimization of preparation of these thin films, we have carefully analysed the effects on the structure, composition, electronic structure, as well as optical properties. Finally, we have fabricated Bi-Sb mixed double perovskite solar cells in a mesoscopic device architecture.

Keywords

thin filmphotovoltaicperovskitesmorphologygrain size
Type
Articles
Information
MRS Advances , Volume 4 , Issue 64: International Materials Research Congress XXVIII , 2019 , pp. 3545 - 3552
Copyright
Copyright © Materials Research Society 2019 

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