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

• DOI: 10.1021/jacs.6b13258
• Publication Date: 2017-04-20T20:21:52Z
• Authors: Nobuya Sakai; Amir Abbas Haghig...; Marina R. Filip; Pabitra K. Nayak; Simantini Nayak; Alexandra Ramadan; Zhiping Wang; Feliciano Giustino; Henry J. Snaith
• Keywords: 01 natural sciences; 0104 chemical sciences

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 me, 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.