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Published in:
15-09-2018
Deposition time effects on optical gap, dark conductivity and X-ray photoresponse properties of thermal evaporated a-Se thin films
Published in: Journal of Materials Science: Materials in Electronics | Issue 22/2018
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Abstract
We prepared the amorphous selenium (a-Se) thin films via thermal evaporated method with different deposition time, revealing that the increase of deposition time was propitious to improve the quality of a-Se thin films. In detail, the optical gap of a-Se thin films enhanced from 2.08 to 2.15 eV, and the transmittance showed the blue shift of absorption edges with prolonging deposition time. Further, the dark conductivity was analyzed systematically around three main physics issues. (i) The initial dark conductivity was high and decayed with test time. (ii) The dark conductivity showed a dependence of applied electric field. (iii) The dark conductivity decreased with extending deposition time. Moreover, a-Se thin films showed the improved X-ray photoconductivity gain from 1.5 to 3.1 times under exposure dose rate of 14.83 × 10−4 Gy/s of X-radiation, with a rapid photoresponse and a small applied electric field requirement.