Time-resolved recombination analysis in kesterite polycrystalline thin films and photovoltaic devices with one-photon and two-photon excitation

Darius Kuciauskas, Ingrid Repins, Ana Kanevce, Jian V. Li, Pat Dippo, Carolyn L. Beall

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Minority carrier lifetime, τB, is one of the key metrics for polycrystalline solar cell absorbers. Based on different spatial carrier-generation profiles obtained using one-photon and two-photon excitation (1PE and 2PE, respectively), we developed a new approach to determine τB in polycrystalline thin films. By comparing time-resolved photoluminescence data measured with 1PE and 2PE, we extract τB and surface recombination velocity S, and resolve charge separation at the pn junction. For coevaporated kesterite (Cu2ZnSnSe4) absorbers, we find S=(0.8-2.1)×104 cm s-1 and τB=7.0±0.5 ns. For corresponding photovoltaic devices, charge separation occurs in 2 ns.

Original languageEnglish
Pages (from-to)100-105
Number of pages6
JournalSolar Energy Materials and Solar Cells
Volume136
DOIs
Publication statusPublished - 2015 May

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films

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