CdTe solar cell with industrial Al:ZnO on soda-lime glass |
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Authors: | Ramesh G Dhere Maximilien Bonnet-EymardEmilie Charlet Emmanuelle PeterJoel N Duenow Jian V LiDarius Kuciauskas Timothy A Gessert |
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Affiliation: | a National Renewable Energy Laboratory (NREL), Golden, CO 80401, United Statesb Saint-Gobain Herzogenrath Research Center, Herzogenrath, Germanyc Saint-Gobain Recherche, 93300 Aubervilliers, France |
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Abstract: | One avenue to enhance CdTe cell performance is to improve the optical transmission of the transparent conductive oxide (TCO)/window layer stack. In this paper, we examine soda-lime float glass coated with an Al-doped ZnO layer and a buffer layer. The possible advantages of using a ZnO-based TCO include reduced surface roughness, improved transparency, and an integrated buffer layer that can be optimized for use in a CdTe PV device. Device processing was modified to address the chemical and thermal differences between the ZnO-based TCO stack produced by Saint-Gobain and the TCOs previously used at the National Renewable Energy Laboratory (NREL). These process modifications produced ~ 8% efficiency for devices without a buffer layer. Incorporation of buffer layers has already produced devices with ~ 11% and > 12% efficiency for CdTe deposition temperatures of 570° and 500°C, respectively. |
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Keywords: | CdTe CdS Al:ZnO Close-spaced sublimation Thin-film solar-cell |
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