Verification Of MN Rule In Dark As Well As In Presence Of Light In a-Se90In4Sb6 Thin Films.

Temperature dependence of conductivity is measured in dark as well as in presence of light in amorphous thin films of Se₉₀In₄Sb₆ in the temperature range 300-340 K and in the intensity range 687-13000 Lux. It is observed that pre-exponential factor (σ₀) depends on activation energy (ΔE). A straight line between Inσ₀ and DE indicates the presence of Meyer - Neldel (MN) rule in dark as well as in presence of light. Linear dependence of ln(σ₀) on DE in case of amorphous material indicate that the conduction band tails a finite energy distance towards the valence band and a Fermi level which is controlled by fixed dominant hole levels deeper in the gap. [ABSTRACT FROM AUTHOR]