Lead-Free Perovskite Semiconductors Based on Germanium-Tin Solid Solutions: Structural and Optoelectronic Properties

Satyawan Nagane, Dibyajyoti Ghosh, Robert L.Z. Hoye, Baodan Zhao, Shahab Ahmad, Alison B. Walker, M. Saiful Islam, Satishchandra Ogale, Aditya Sadhanala

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Solar cells and optoelectronics based on lead halide perovskites are generating considerable interest but face challenges with the use of toxic lead. In this study, we fabricate and characterize lead-free perovskites based on germanium and tin solid solutions, CH3NH3Sn(1-x)GexI3 (0 ≤ x ≤ 1). We show that these perovskite compounds possess band gaps from 1.3 to 2.0 eV, which are suitable for a range of optoelectronic applications, from single junction devices and top cells for tandems to light-emitting layers. Their thermodynamic stability and electronic properties are calculated for all compositions and agree well with our experimental measurements. Our findings demonstrate an attractive family of lead-free perovskite semiconductors with a favorable band-gap range for efficient single-junction solar cells.

Original languageEnglish
Pages (from-to)5940-5947
Number of pages8
JournalJournal of Physical Chemistry C
Issue number11
Early online date28 Feb 2018
Publication statusPublished - 22 Mar 2018


ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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