Electrical and optical characterization of the influence of chemical bath deposition time and temperature on CdS/Cu(In,Ga)Se2 junction properties in Cu(In,Ga)Se2 solar cells

Han Kyu Seo, Eun A. Ok, Won Mok Kim, Jong Keuk Park, Tae Yeon Seong, Dong Wha Lee, Hoon Young Cho, Jeung Hyun Jeong

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The effects of varying the conditions for the chemical bath deposition (CBD) of cadmium sulfide (CdS) layers on CdS/Cu(In,Ga)Se2 (CIGS) hetero-junctions were investigated using photoluminescence (PL), electroluminescence (EL), deep level transient spectroscopy (DLTS), and red-light-illuminated current-voltage (I-V) measurements. We demonstrated that varying CBD-CdS conditions such as the temperature and time influenced the recombination pathways around the CdS/CIGS junction via the formation of different electronic defects, which eventually changed the photovoltaic conversion efficiency. As the CBD-CdS time and temperature were increased, the cell efficiency decreased. PL measurements revealed that this degradation of the cell efficiency was accompanied by increases in the defect-related recombination, which were attributed to the existence of donor defects around CdS/CIGS having an energy level of 0.65 eV below conduction band, as revealed by DLTS. Increasing distortions in the red-light-illuminated I-V characteristics suggested that the related defects might also have played a critical role in metastable changes around the CdS/CIGS junction. Because the CBD-CdS time and temperature were considered to influence the diffusion of impurities into the CIGS surface, the evolution of the efficiency, PL spectra, defect populations, and red-light-illuminated I-V characteristics observed in this work could be attributed to the diffusion of impurities during the CBD-CdS process.

Original languageEnglish
Pages (from-to)289-293
Number of pages5
JournalThin Solid Films
Volume546
DOIs
Publication statusPublished - 2013 Nov 1

Keywords

  • CBD-CdS
  • CIGS solar cell
  • DLTS
  • Metastability
  • Photoluminescence
  • Recombination

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Metals and Alloys
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

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