The Urbach focus and hydrogenated amorphous silicon

Orapunt, Farida; O'Leary, Stephen K.
January 2004
Applied Physics Letters;1/26/2004, Vol. 84 Issue 4, p523
Academic Journal
We critically examine the validity of the Urbach “focus” concept for the case of hydrogenated amorphous silicon. Our approach involves an analysis of a broad assortment of hydrogenated amorphous silicon experimental optical absorption data from many different sources. We find that these experimental data are consistent with the notion of the Urbach focus concept. The implications of this conclusion are explored. © 2004 American Institute of Physics.


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