Issue 47, 2015

Lead-free germanium iodide perovskite materials for photovoltaic applications

Abstract

Computational screening based on density-functional-theory calculations reveals Ge as a candidate element for replacing Pb in halide perovskite compounds suitable for light harvesting. Experimentally, three AGeI3 (A = Cs, CH3NH3 or HC(NH2)2) halide perovskite materials have been synthesized. These compounds are stable up to 150 °C, and have bandgaps correlated with the A-site cation size. CsGeI3-based solar cells display higher photocurrents, of about 6 mA cm−2, but are limited by poor film forming abilities and oxidising tendencies. The present results demonstrate the utility of combining computational screening and experimental efforts to develop lead-free halide perovskite compounds for photovoltaic applications.

Graphical abstract: Lead-free germanium iodide perovskite materials for photovoltaic applications

Supplementary files

Article information

Article type
Paper
Submitted
26 7 2015
Accepted
12 10 2015
First published
16 10 2015

J. Mater. Chem. A, 2015,3, 23829-23832

Lead-free germanium iodide perovskite materials for photovoltaic applications

T. Krishnamoorthy, H. Ding, C. Yan, W. L. Leong, T. Baikie, Z. Zhang, M. Sherburne, S. Li, M. Asta, N. Mathews and S. G. Mhaisalkar, J. Mater. Chem. A, 2015, 3, 23829 DOI: 10.1039/C5TA05741H

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