Analysis of Back-Contact Interface Recombination in Thin-Film Solar Cells

Sanjoy Paul, Sachit Grover, Ingrid L. Repins, Brian M. Keyes, Miguel A. Contreras, Kannan Ramanathan, Rommel Noufi, Zhibo Zhao, Feng Liao, Jian V. Li

Research output: Contribution to journalArticlepeer-review

42 Scopus Citations


The open-circuit voltage (VOC) in a generic TCO/buffer/absorber/back-contact thin-film solar cell device is a key parameter in the recombination analysis. In particular, VOC is sensitively influenced by the interface recombination at the buffer/absorber front interface and at the absorber/back-contact interface. This paper reports the temperature, excitation light intensity, and wavelength-dependent open-circuit voltage analysis to separate and quantify recombination rates in solar cells at the front and back interfaces, in the depletion regions, and in the quasi-neutral region. The wavelength-dependent VOC analysis is exploited to extract the absorber/back-contact recombination coefficient. The experimentally observed results are verified using SCAPS-1D (one dimensional - a solar cell capacitance simulator) simulation.

Original languageAmerican English
Pages (from-to)871-878
Number of pages8
JournalIEEE Journal of Photovoltaics
Issue number3
StatePublished - 2018

Bibliographical note

Publisher Copyright:
© 2011-2012 IEEE.

NREL Publication Number

  • NREL/JA-5K00-72052


  • Back-contact
  • interface
  • open-circuit voltage
  • photovoltaics
  • recombination
  • SCAPS-1D


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