High efficiency thin film CdTe solar cells (original) (raw)

1980

Abstract

Thin films of CdTe were vacuum deposited onto glass and ITO-coated glass substrates using a hot-wall technique. Improved source conditions and system cleanliness enabled large pinhole-free regions capable of providing large area evaporated Au devices (greater than 1 cm(2)). An optimized Au thickness was determined and characterized in terms of sheet resistance and optical transmission. An evaporated Au/Ag combined grid and a SiO Ar coating yielded 1 sq cm active area Au-CdTe-ITO devices with J/sub sc/ = 13 mA/sq cm and /sub oc/ of 0.43 volt. The 1.4% efficiency is only temporarily limited by the uncharacteristically low 0.25 fill factor which is believed to be caused by an anomaly near the ITO contact. A three-source system with effusion cell type sources and a rotary shutter was designed, built, and successfully tested; it should improve control over film and device reproducibility and also provide greater versatility in controlling doping concentration and film stoichiometry. The ...

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