KBaTeBiO6: A Lead-Free, Inorganic Double-Perovskite Semiconductor for Photovoltaic Applications

Arashdeep Singh Thind, Shalinee Kavadiya, Mojgan Kouhnavard, Robin Wheelus, Liang-Yi Lin, Clayton Kacica, Hemant Kumar Mulmudi, Kinga A Unocic, Albina Y Borisevich, Ghanshyam Pilania, Pratim Biswas, Rohan Mishra, Sung Beom Cho

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Solar cells made up of lead-halide perovskites have shown a remarkable increase in power conversion efficiency; however, they are plagued with instability issues that, combined with the toxicity of lead, have led to a search for new semiconductors made up of heavy and nontoxic metals such as bismuth. Here, we report on a new, inorganic, double perovskite oxide semiconductor: KBaTeBiO6, which has an experimental indirect band gap of 1.88 eV and shows excellent stability. We combined data analytics and high throughput density functional theory calculations to search through thousands of hypothetical inorganic double perovskite oxides containing bismuth and predict KBaTeBiO6 as a potential photovoltaic material, which was subsequently synthesized using a wet-chemistry route. The calculated effective mass of the charge carriers for KBaTeBiO6 is comparable to the best performing Bi-halide double perovskites. Our work demonstrates the untapped potential of inorganic Bi-based double perovskite oxides—that offer the ability to change both the cation combination and their stoichiometry to achieve desired electronic properties—as exciting, benign, and stable alternatives to lead-halide perovskites for various semiconducting applications.
Original languageAmerican English
Pages (from-to)4769-4778
Number of pages10
JournalChemistry of Materials
Volume31
Issue number13
DOIs
StatePublished - 11 Jun 2019

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