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Issue 47, 2015
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Lead-free germanium iodide perovskite materials for photovoltaic applications

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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

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Supplementary files

Article information


Submitted
26 jul 2015
Accepted
12 okt 2015
First published
16 okt 2015

J. Mater. Chem. A, 2015,3, 23829-23832
Article type
Paper
Author version available

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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