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The influence of hydrogen on the electrical properties of a-GaAs.

By Murri R., Pinto N., Schiavulli L., Fukuhisa R. and Mirenghi L.


The electrical properties of hydrogenated amorphous gallium arsenide prepared by r.f. sputtering have been studied. ConductivitY measurements as a function of T evidence two different behaviours depending on the increasing (heating) or decreasing (cooling) T. Metastable effects are also evidenced at T < 360 K, probably linked to the diffusion of bonded hydrogen in the network. Several conductivity curves show a downward kink at T congruent-to 360 K. The presence of this kink has been explained using a model proposed by Spear and assuming the shift of the conduction band edge as a main contribution to the variation of the mobility gap. The Tauc optical gap, the activation energies of the conductivity and the hydrogen content in the network show a rapid increase when C(H) goes from 0 to 10% in the gas phase

Year: 1993
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