Charge transport in the spatially correlated exponential random energy landscape: effect of the nonpositive correlation function

Physical Chemistry Chemical Physics. 2022. Vol. 24. No. 16. P. 9534–9542.

Novikov S. V.

Charge transport in amorphous semiconductors having spatially correlated exponential density of states
(DOS) has been considered for the arbitrary behavior of the correlation function of random energies.
Average carrier velocity is exactly calculated for the quasi-equilibrium (nondispersive) transport regime.
For the symmetric exponential DOS with exponential tails for low and high energies and nonpositive
correlation function the temperature of the transition to the dispersive transport regime depends on
correlation properties and becomes greater than the traditional estimation based on the DOS decay
energy kT = U 0 . Another new feature of the transport in the landscape having nonpositive correlation
function is the decrease of the mobility with the field in the low field region and development of the
universal mobility field dependence for stronger fields.

Keywords: hopping transport, прыжковый транспорт, exponential density of states, экспоненциальная плотность состояний, amorphous semiconductors, аморфные полупроводники, коррелированный беспорядок, correlated disorder

Publication based on the results of: Theoretical and experimental studies of electronic and photonic processes in promising heterogeneous structures designed for polymer and perovskite photoconverters in order to increase the efficiency and stability of device characteristics (2022)