✦ LIBER ✦

Influence of surface composition on back-contact performance in CdTe/CdS PV devices

✍ Scribed by Dean Levi; David Albin; David King

Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 140 KB
Volume: 8
Category: Article
ISSN: 1062-7995
DOI: 10.1002/1099-159x(200011/12)8:6<591::aid-pip332>3.0.co;2-p

No coin nor oath required. For personal study only.

✦ Synopsis

The atomic composition of the surface of the CdTe layer in a CdTe:CdS photovoltaic "PV# device has a signi_cant in~uence on the quality of the electrical contact to this layer[ This paper reports the results of a systematic study that correlates the composition of the back surface as measured with X!ray photoelectron spectroscopy "XPS# with pre!contact processing and device performance[ We found that certain processing steps produce an oxide layer that degrades device performance by pro! ducing a metalÐoxideÐsemiconductor "MOS# contact\ rather than the intended metalÐsemiconductor\ Schottky barrier contact[ We also found that the as! deposited CdTe _lm is cadmium!rich for several hundred angstroms at the back surface[ This n!type layer may impede current ~ow for majority holes\ degrading

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