Photoluminescence study and observation of unusual optical transitions in Cu2ZnSnSe4/CdS/ZnO solar cells

Souhaib Oueslati, Guy Brammertz, Marie Buffiere, Christine Köble, Touayar Oualid, Marc Meuris, Jef Poortmans

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

In this paper, we examine photoluminescence spectra (PL) of Cu2ZnSnSe4/CdS/ZnO solar cells, based on an absorber layer fabricated by selenization of sputtered Cu, Zn, Sn multilayers, via temperature-dependent and illumination power-dependent measurements. We observe anomalous emission behavior: the PL peak initially decreases with increasing temperature (red shift) in the temperature range 10-60 K, followed by a blue shift at higher temperature in the range 60-180 K. A recombination model is proposed that is able to explain both temperature dependent PL as well as power-dependent PL. The important aspect of the proposed model is taking into account the presence of strong potential fluctuations in the absorber layer, which can also contribute to the low Voc values generally observed in Cu2ZnSnSe4, based solar cells.

Original languageEnglish
Pages (from-to)340-345
Number of pages6
JournalSolar Energy Materials and Solar Cells
Volume134
DOIs
Publication statusPublished - 2015
Externally publishedYes

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Keywords

  • CuZnSnSe/CdS/ZnO
  • Donor-acceptor pairs DAP
  • Photoluminescence spectra (PL)
  • Potential fluctuations
  • Q-DAP
  • Quasi-donor-acceptor pairs
  • Recombination
  • Solar cells

ASJC Scopus subject areas

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

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