ELECTRICAL-CONDUCTION MECHANISM IN A-SE-80-XTEXGA20 FILMS -LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-20)

The dark conductivity and transient photoconductivity measurements on thin films of a-Se80-xTexGa20 (0 less than or equal to x less than or equal to 20) have been reported in the temperature range from 148 to 3 18 K. The results indicate that, at higher temperatures, hopping condu ction takes place in the tail states. At lower temperatures the conduc tion is due to variable-range hopping, which is in fair agreement with the Mott condition of variable-range hopping. The transient photocond uctivity measurements show non-exponential decay, and recombination in these glasses may be considered to take place through the valence and conduction bands.