Crystallographic, Optical, and Electronic Properties of the Cs2AgBi1–xInxBr6 Double Perovskite: Understanding the Fundamental Photovoltaic Efficiency Challenges

Laura Schade, Suhas Mahesh, George Volonakis, Marios Zacharias, Bernard Wenger, Felix Schmidt, Sameer Vajjala Kesava, Dharmalingam Prabhakaran, Mojtaba Abdi-Jalebi, Markus Lenz, Feliciano Giustino, Giulia Longo, Paolo G. Radaelli, Henry J. Snaith*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

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.
Original languageEnglish
Pages (from-to)1073-1081
Number of pages9
JournalACS Energy Letters
Volume6
Issue number3
Early online date19 Feb 2021
DOIs
Publication statusPublished - 12 Mar 2021

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