Solution-Processed Cesium Hexabromopalladate(IV), Cs2PdBr6, for Optoelectronic Applications

Nobuya Sakai; Amir Abbas Haghighirad; Marina R Filip; Pabitra K Nayak; Simantini Nayak; Alexandra Ramadan; Zhiping Wang; Feliciano Giustino; Henry J Snaith

doi:10.1021/jacs.6b13258

Solution-Processed Cesium Hexabromopalladate(IV), Cs₂PdBr₆, for Optoelectronic Applications

J Am Chem Soc. 2017 May 3;139(17):6030-6033. doi: 10.1021/jacs.6b13258. Epub 2017 Apr 20.

Authors

Nobuya Sakai¹, Amir Abbas Haghighirad¹, Marina R Filip², Pabitra K Nayak¹, Simantini Nayak³, Alexandra Ramadan¹, Zhiping Wang¹, Feliciano Giustino², Henry J Snaith¹

Affiliations

¹ Clarendon Laboratory, Department of Physics, University of Oxford , Parks Road, Oxford OX1 3PU, United Kingdom.
² Department of Materials, University of Oxford , 16 Parks Road, Oxford OX1 3PH, United Kingdom.
³ Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford , South Parks Road, Oxford OX1 3QR, United Kingdom.

PMID: 28426219
DOI: 10.1021/jacs.6b13258

Abstract

Lead halide perovskites are materials with excellent optoelectronic and photovoltaic properties. However, some hurdles remain prior to commercialization of these materials, such as chemical stability, phase stability, sensitivity to moisture, and potential issues due to the toxicity of lead. Here, we report a new type of lead-free perovskite related compound, Cs₂PdBr₆. This compound is solution processable, exhibits long-lived photoluminescence, and an optical band gap of 1.6 eV. Density functional theory calculations indicate that this compound has dispersive electronic bands, with electron and hole effective masses of 0.53 and 0.85 m_e, respectively. In addition, Cs₂PdBr₆ is resistant to water, in contrast to lead-halide perovskites, indicating excellent prospects for long-term stability. These combined properties demonstrate that Cs₂PdBr₆ is a promising novel compound for optoelectronic applications.

Publication types

Research Support, Non-U.S. Gov't