Optical absorption and Ramanspectra ina numberofa-Si, a&: Handa-(Si: H) : B sampleshavebeeninvestigated. It isshown thattheopticalgapchangesareweaklycorrelated with thechangesinropeakwidthinRamanspectra but arewellcorrelatedwith thechanges in the TA peak intensity The correlation between the amplitude of optical gap fluctuations, determined from theoptical absorptionspectra, andthe rApedkintensity hasbeenobserved. These resultssuggest that theoptical gapand the amplitudeofits fluctuationsin amorphous silicon and its alloys depend not only on bond-angle dispersion but also substantially on the degree of stmctwal disorder on a scale of about 4-6 A or greater.
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