Crystallographic, optical, and electronic properties of the Cs2AgBi1–xInxBr6 double perovskite. Understanding the fundamental photovoltaic efficiency challenges

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Authors
Schade, Laura
Mahesh, Suhas
Volonakis, George
Zacharias, Marios
Wenger, Bernard
Kesava, Sameer Vajjala
Prabhakaran, Dharmalingam
Abdi-Jalebi, Mojtaba
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Publication date
19.02.2021
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01A - Journal article
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ACS Energy Letters
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6
Issue / Number
3
Pages / Duration
1073-1081
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American Chemical Society
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Washington
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Abstract
We present a crystallographic and optoelectronic study of the double perovskite Cs2AgBi1–xInxBr6. From structural characterization we determine that the indium cation shrinks the lattice and shifts the cubic-to-tetragonal phase transition point to lower temperatures. The absorption onset is shifted to shorter wavelengths upon increasing the indium content, leading to wider band gaps, which we rationalize through first-principles band structure calculations. Despite the unfavorable band gap shift, we observe an enhancement in the steady-state photoluminescence intensity, and n-i-p photovoltaic devices present short-circuit current greater than that of neat Cs2AgBiBr6 devices. In order to evaluate the prospects of this material as a solar absorber, we combine accurate absorption measurements with thermodynamic modeling and identify the fundamental limitations of this system. Provided radiative efficiency can be increased and the choice of charge extraction layers are specifically improved, this material could prove to be a useful wide band gap solar absorber.
Keywords
absorption, indium, electrical conductivity, perovskites, materials
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2380-8195
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English
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Yes
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Published
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LENZ, Markus, Laura SCHADE, Suhas MAHESH, George VOLONAKIS, Marios ZACHARIAS, Bernard WENGER, Felix SCHMIDT, Sameer Vajjala KESAVA, Dharmalingam PRABHAKARAN, Mojtaba ABDI-JALEBI, Giulia LONGO, Paolo RADAELLI, Henry SNAITH und Feliciano GIUSTINO, 2021. Crystallographic, optical, and electronic properties of the Cs2AgBi1–xInxBr6 double perovskite. Understanding the fundamental photovoltaic efficiency challenges. ACS Energy Letters. 19 Februar 2021. Bd. 6, Nr. 3, S. 1073–1081. DOI 10.1021/acsenergylett.0c02524. Verfügbar unter: https://irf.fhnw.ch/handle/11654/33313