Issue 12, 2016

Discovering lead-free perovskite solar materials with a split-anion approach

Abstract

Organic–inorganic hybrid perovskite solar materials, being low-cost and high-performance, are promising for large-scale deployment of the photovoltaic technology. A key challenge that remains to be addressed is the toxicity of these materials since the high-efficiency solar cells are made of lead-containing materials, in particular, CH3NH3PbI3. Here, based on first-principles calculation, we search for lead-free perovskite materials based on the split-anion approach, where we replace Pb with non-toxic elements while introducing dual anions (i.e., splitting the anion sites) that preserve the charge neutrality. We show that CH3NH3BiSeI2 and CH3NH3BiSI2 exhibit improved band gaps and optical absorption over CH3NH3PbI3. The split-anion approach could also be applied to pure inorganic perovskites, significantly enlarging the pool of candidate materials in the design of low-cost, high-performance and environmentally-friendly perovskite solar materials.

Graphical abstract: Discovering lead-free perovskite solar materials with a split-anion approach

Supplementary files

Article information

Article type
Paper
Submitted
28 jun 2015
Accepted
15 aug 2015
First published
21 aug 2015

Nanoscale, 2016,8, 6284-6289

Discovering lead-free perovskite solar materials with a split-anion approach

Y. Sun, J. Shi, J. Lian, W. Gao, M. L. Agiorgousis, P. Zhang and S. Zhang, Nanoscale, 2016, 8, 6284 DOI: 10.1039/C5NR04310G

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