Impact of Bulk Properties and Local Secondary Phases on the Cu2(Zn,Sn)Se4 Solar Cells Open-Circuit Voltage

Ana Kanevce, Ingrid Repins, Suhuai Wei

Research output: Contribution to journalArticlepeer-review

70 Scopus Citations

Abstract

As the development of kesterite solar cells accelerates, the bottlenecks in device performance need to be identified and ways for their circumvention defined and developed. In this work, we use 2-dimensional (2D) numerical simulations to explore possible reasons for low open-circuit voltage (Voc) in Cu2(Zn,Sn)Se4 (CZTSe) solar cells. High defect density in the CZTSe absorber and at the CZTSe/CdS interface can be significant reasons for Voc deficit, but they do not explain all of the losses observed experimentally. Local deviation from stoichiometry could create secondary phases with a lower band gap compared to the absorber. These secondary phases can be severely harmful to Voc if located in the vicinity of the heterointerface and along the grain boundaries.

Original languageAmerican English
Pages (from-to)119-125
Number of pages7
JournalSolar Energy Materials and Solar Cells
Volume133
DOIs
StatePublished - 2015

Bibliographical note

Publisher Copyright:
© 2014 Elsevier B.V. All rights reserved.

NREL Publication Number

  • NREL/JA-5J00-60728

Keywords

  • CZTSe solar cells
  • Device performance
  • Numerical simulations

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