Impact of Individual Structural Defects in GaAs Solar Cells: A Correlative and In Operando Investigation of Signatures, Structures, and Effects

Qiong Chen, Brandon S. McKeon, Sunny Y. Zhang, Fan Zhang, Changkui Hu, Timothy H. Gfroerer, Mark W. Wanlass, David J. Smith, Yong Zhang

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Defects usually degrade device performance. Thus, many techniques and effort are devoted to studying semiconductor defects. However, it is rarely known: i) how individual defects affect device performance; ii) how the impact depends on the device operating conditions; iii) how the impact varies from one defect to another; and iv) how these variations are correlated to the microscopic-scale defect structure. To address these crucial questions, an array of correlative and spatially resolved techniques, including electroluminescence, photoluminescence, Raman, I–V characteristics, and high-resolution electron microscopy, are used to characterize dislocation defects in GaAs solar cells. Significantly, the study is carried out in a series mode and in operando. This approach provides quantitative and definitive correlation between the atomistic structure of defects and their explicit effects on device performance, thus giving unprecedented insight into defect physics.

Original languageEnglish (US)
Article number2001487
JournalAdvanced Optical Materials
Volume9
Issue number2
DOIs
StatePublished - Jan 18 2021

Keywords

  • GaAs solar cells
  • I–V characteristic
  • Raman spectroscopy
  • dislocation defects
  • in operando characterization
  • photoluminescence
  • series mode

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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