I.J. Romero

National Renewable Energy Laboratory

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Bobby To

National Renewable Energy Laboratory

A. Duda

Oil and Gas Institute - National Research Institute

R. G. Dhere

National Renewable Energy Laboratory

Y. Yan

Shaanxi Normal University

Jie Zhou

Kunming University of Science and Technology

X. Wu

Nanjing University of Aeronautics and Astronautics

Clay DeHart

National Renewable Energy Laboratory

Craig L. Perkins

National Renewable Energy Laboratory

Y. Zhang

Tsinghua University

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Georgia Institute of Technology

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University of Hawaiʻi at Mānoa

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Budapest University of Technology and Economics

University of Illinois Urbana-Champaign

Oil and Gas Institute - National Research Institute

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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 I.J. Romero Y. Zhang

In the conventional CdS/CdTe device structure, the poly-CdS window layer has a bandgap of /spl sim/2.4 eV, which causes absorption in the short-wavelength region. Higher short-circuit current densities (J/sub sc/) can be achieved by reducing the CdS thickness, but this can adversely impact device open-circuit voltage (V/sub oc/) and fill factor (FF). Also, poly-CdS film has about 10% lattice mismatch related to the CdTe film, which limits the improvement of device V/sub oc/ 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 J/sub sc/ of the CdTe device can be greatly improved while maintaining higher V/sub oc/ and FF. We have fabricated a CdTe cell demonstrating an NREL-confirmed J/sub sc/ of 25.85 mA/cm/sup 2/ and a total-area efficiency of 15.4%.

Cadmium telluride photovoltaics

Open-circuit voltage

10.1109/pvsc.2002.1190619

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