Bulk and interface characterization and modeling of copper indium aluminum gallium selenide (CIAGS) solar cells

Mandip J. Sibakoti, Sreejith Karthikeyan, Sehyun Hwang, Timothy Bontrager, Stephen A. Campbell

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

Abstract

The saturation of V OC at larger band gaps in Cu(In, Ga)Se 2 devices presents a major challenge in developing high efficiency solar devices for tandem solar applications. Although recent studies have shown that recombination at the buffer/absorber interface dominates in high Ga samples with wide band gaps, the interface parameters are not well understood to accurately model the device behavior. In this work we have applied temperature dependent CV and DLCP methods to estimate the interface state density along the bandgap in CIGS and CIAGS based solar devices. We have also used DLTS to study the nature of deep levels in CIGS and CIAGS devices. Based on our analysis and device simulation results, we attribute the V OC saturation in wide gap CIAGS devices to increased recombination rate at the interface.

Original languageEnglish (US)
Title of host publication2017 IEEE 44th Photovoltaic Specialist Conference, PVSC 2017
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1-6
Number of pages6
ISBN (Electronic)9781509056057
DOIs
StatePublished - 2017
Event44th IEEE Photovoltaic Specialist Conference, PVSC 2017 - Washington, United States
Duration: Jun 25 2017Jun 30 2017

Publication series

Name2017 IEEE 44th Photovoltaic Specialist Conference, PVSC 2017

Other

Other44th IEEE Photovoltaic Specialist Conference, PVSC 2017
CountryUnited States
CityWashington
Period6/25/176/30/17

Bibliographical note

Funding Information:
This project is supported by the Sunshot program of Department of Energy Sunshot program (Award DE-EE0005319). The device fabrication was performed in Minnesota Nano Center (MNC) under partial support of the National Nano Coordinated Infrastructure program at NSF.

Publisher Copyright:
© 2017 IEEE.

Keywords

  • CIAGS
  • CIGS
  • DLCP
  • DLTS
  • Electrical Characterization
  • SCAPS modeling
  • Wide band-gap solar cells

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