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

Research output: Contribution to journalArticle

20 Citations (Scopus)
116 Downloads (Pure)

Abstract

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
Volume122
Issue number11
Early online date28 Feb 2018
DOIs
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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