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

X. Wu, R. G. Dhere, Y. Yan, M. J. Romero, Y. Zhang, J. Zhou, C. DeHart, A. Duda, C. Perkins, B. To

Research output: Contribution to conferencePaperpeer-review

55 Scopus Citations

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 the CdTe 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 be greatly 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
Pages531-534
Number of pages4
StatePublished - 2002
Event29th IEEE Photovoltaic Specialists Conference - New Orleans, LA, United States
Duration: 19 May 200224 May 2002

Conference

Conference29th IEEE Photovoltaic Specialists Conference
Country/TerritoryUnited States
CityNew Orleans, LA
Period19/05/0224/05/02

Bibliographical note

For preprint version including full text online document, see NREL/CP-520-31429

NREL Publication Number

  • NREL/CP-520-33716

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