Geminate electron-hole recombination in organic solids in the presence of a donor-acceptor heterojunction

Wojcik, Mariusz; Michalak, Przemyslaw; Tachiya, M.
April 2010
Applied Physics Letters;4/19/2010, Vol. 96 Issue 16, p162102
Academic Journal
Geminate electron-hole recombination is one of the main factors limiting the efficiency of organic solar cells. We present a systematic study of this process based on both analytical and simulation models. We determine how the charge-pair separation probability is affected by the hopping length of charge carriers, the presence of a donor-acceptor heterojunction, electron and hole mobilities, and other factors. We show that the charge-pair separation probability of an electron and a hole which are initially at the contact distance is maximized when the electron and hole mobilities are equal to each other.


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