Searching for 'Defect-Tolerant' Photovoltaic Materials: Combined Theoretical and Experimental Screening

Prashun Gorai, Vladan Stevanovic, Riley Brandt, Jeremy Poindexter, Rachel Kurchin, Robert Hoye, Lea Nienhaus, Mark Wilson, J. Polizzotti, Raimundas Sereika, Raimundas Zaltauskas, Lana Lee, Judith MacManus-Driscoll, Moungi Bawendi, Tonio Buonassisi

Research output: Contribution to journalArticlepeer-review

285 Scopus Citations

Abstract

Recently, we and others have proposed screening criteria for 'defect-tolerant' photovoltaic (PV) absorbers, identifying several classes of semiconducting compounds with electronic structures similar to those of hybrid lead-halide perovskites. In this work, we reflect on the accuracy and prospects of these new design criteria through a combined experimental and theoretical approach. We construct a model to extract photoluminescence lifetimes of six of these candidate PV absorbers, including four (InI, SbSI, SbSeI, and BiOI) for which time-resolved photoluminescence has not been previously reported. The lifetimes of all six candidate materials exceed 1 ns, a threshold for promising early stage PV device performance. However, there are variations between these materials, and none achieve lifetimes as high as those of the hybrid lead-halide perovskites, suggesting that the heuristics for defect-tolerant semiconductors are incomplete. We explore this through first-principles point defect calculations and Shockley-Read-Hall recombination models to describe the variation between the measured materials. In light of these insights, we discuss the evolution of screening criteria for defect tolerance and high-performance PV materials.
Original languageAmerican English
Pages (from-to)4667-4674
Number of pages8
JournalChemistry of Materials
Volume29
Issue number11
DOIs
StatePublished - 2017

NREL Publication Number

  • NREL/JA-5K00-68928

Keywords

  • electronic structures
  • photovoltaic absorbers
  • semiconducting compounds

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