High-Efficiency Polycrystalline CdTe Thin-Film Solar Cells with an Oxygenated Amorphous CdS (a-CdS:O) Window Layer: Preprint

Research output: Contribution to conferencePaper

Abstract

In the conventional CdS/CdTe device structure, the poly-CdS window layer has a bandgap of~2.4 eV, which causes absorption in the short-wavelength region. Higher short-circuit current densities (Jsc) can be achieved by reducing the CdS thickness, but this can adversely impact device open-circuit voltage (Voc) and fill factor (FF). Also, poly-CdS film has about 10% lattice mismatch related to theCdTe film, which limits the improvement of device Voc and FF. In this paper, we report a novel window material: oxygenated amorphous CdS film (a-CdS:O) prepared at room temperature by rf sputtering. The a-CdS:O film has a higher optical bandgap (2.5-3.1 eV) than the poly-CdS film and an amorphous structure. The preliminary device results have demonstrated that Jsc of the CdTe device can begreatly improved while maintaining higher Voc and FF. We have fabricated a CdTe cell demonstrating an NREL-confirmed Jsc of 25.85 mA/cm2 and a total-area efficiency of 15.4%.
Original languageAmerican English
Number of pages7
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-520-31429

Keywords

  • atomic force microscopy (AFM)
  • cadmium telluride (CdTe) photovoltaic solar cells modules
  • high-efficiency polycrystalline
  • oxygenated amorphous cds
  • photoemission spectroscopy (XPS)
  • PV
  • raman spectra
  • short-wavelength region
  • solar cells
  • thin film
  • X-ray diffraction

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