Polycrystalline Thin Film Photovoltaics: Research, Development, and Technologies: Preprint

Research output: Contribution to conferencePaper

Abstract

II-VI binary thin-film solar cells based on cadmium telluride (CdTe) and I-III-VI ternary thin-film solar cells based on copper indium diselenide (CIS) and related materials have been the subject of intense research and development in the past few years. Substantial progress has been made thus far in the area of materials research, device fabrication, and technology development, and numerousapplications based on CdTe and CIS have been deployed worldwide. World record efficiency of 16.5% has been achieved by NREL scientists for a thin-film CdTe solar cell using a modified device structure. Also, NREL scientists achieved world-record efficiency of 21.1% for a thin-film CIGS solar cell under a 14X concentration and AM1.5 global spectrum. When measured under a AM1.5 direct spectrum,the efficiency increases to 21.5%. Pathways for achieving 25% efficiency for tandem polycrystalline thin-film solar cells are elucidated. R&D issues relating to CdTe and CIS are reported in this paper, such as contact stability and accelerated life testing in CdTe, and effects of moisture ingress in thin-film CIS devices. Substantial technology development is currently under way, with variousgroups reporting power module efficiencies in the range of 7.0% to 12.1% and power output of 40.0 to 92.5 W. A number of lessons learned during the scale-up activities of the technology development for fabrication of thin-film power modules are discussed. The major global players actively involved in the technology development and commercialization efforts using both rigid and flexible powermodules are highlighted.
Original languageAmerican English
Number of pages9
StatePublished - 2002
Event29th IEEE PV Specialists Conference - New Orleans, Louisiana
Duration: 20 May 200224 May 2002

Conference

Conference29th IEEE PV Specialists Conference
CityNew Orleans, Louisiana
Period20/05/0224/05/02

Bibliographical note

Prepared for the 29th IEEE PV Specialists Conference, 20-24 May; 2002, New Orleans, Louisiana

NREL Publication Number

  • NREL/CP-520-32187

Keywords

  • cadmium telluride (CdTe) photovoltaic solar cells modules
  • copper indium diselenide (CIS)
  • device fabrication
  • I-III-VI ternary thin-film
  • II-VI binary
  • power modules
  • PV
  • solar cells
  • thin film

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