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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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Publication details

The article was received on 26 Jul 2015, accepted on 12 Oct 2015 and first published on 16 Oct 2015


Article type: Paper
DOI: 10.1039/C5TA05741H
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J. Mater. Chem. A, 2015,3, 23829-23832

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    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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