Process variability in Cu2ZnSnSe4 solar cell devices: Electrical and structural investigations

Guy Brammertz, Marie Buffiere, Christophe Verbist, Souhaib Oueslati, Jonas Bekaert, Hossam Elanzeery, Khaled Ben Messaoud, Sylvester Sahayaraj, Maria Batuk, Joke Hadermann, Christine Koble, Marc Meuris, Jozef Poortmans

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

We have fabricated 9.7% efficient Cu2ZnSnSe4/CdS/ZnO solar cells by H2Se selenization of sequentially sputtered metal layers. Despite the good efficiency obtained, process control appears to be difficult. In the present contribution we compare the electrical and physical properties of two devices with nominal same fabrication procedure, but 1% and 9.7% power conversion efficiency respectively. We identify the problem of the lower performing device to be the segregation of ZnSe phases at the backside of the sample. This ZnSe seems to be the reason for the strong bias dependent photocurrent observed in the lower performing devices, as it adds a potential barrier for carrier collection. The reason for the different behavior of the two nominally same devices is not fully understood, but speculated to be related to sputtering variability.

Original languageEnglish
Title of host publication2015 IEEE 42nd Photovoltaic Specialist Conference, PVSC 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479979448
DOIs
Publication statusPublished - 14 Dec 2015
Externally publishedYes
Event42nd IEEE Photovoltaic Specialist Conference, PVSC 2015 - New Orleans, United States
Duration: 14 Jun 201519 Jun 2015

Other

Other42nd IEEE Photovoltaic Specialist Conference, PVSC 2015
CountryUnited States
CityNew Orleans
Period14/6/1519/6/15

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Keywords

  • Cu2ZnSnSe4
  • Kesterite
  • process control
  • solar cells

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials

Cite this

Brammertz, G., Buffiere, M., Verbist, C., Oueslati, S., Bekaert, J., Elanzeery, H., Ben Messaoud, K., Sahayaraj, S., Batuk, M., Hadermann, J., Koble, C., Meuris, M., & Poortmans, J. (2015). Process variability in Cu2ZnSnSe4 solar cell devices: Electrical and structural investigations. In 2015 IEEE 42nd Photovoltaic Specialist Conference, PVSC 2015 [7355797] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/PVSC.2015.7355797