Predictions of the Onsager theory based on an exponential distribution of electron‐hole separation distances

摘要

An analytic expression for the free‐carrier photogeneration efficiency is derived which is based on the Onsager theory of geminate recombination. The expression assumes that the initial distribution of thermalized electron‐hole pairs is described by the function g (r) = (1/4πr2b)  exp(-r/b), where r is the electron‐hole separation distance and b is a dispersion parameter. An evaluation of the electric field and temperature dependences of the photogeneration efficiency is described. A comparison of results obtained with exponential and δ function distributions is presented and discussed.