Interfacial Design For Reducing Charge Recombination In Photovoltaics
APPLIED PHYSICS LETTERS(2013)
Abstract
Key to high power conversion efficiency of organic solar cells is to minimize charge recombination (CR) at electron donor/acceptor interfaces. Here, nonadiabatic quantum molecular dynamics simulation shows how the interfacial structure can be controlled by molecular design at acene/C-60 interfaces to suppress CR. Orders-of-magnitude reduction of the CR rate is achieved through drastic modification of interfacial structure by attaching phenyl groups to tetracene. This finding confirms a molecular design principle for efficient organic photovoltaics underlying a recent experimental study. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4794983]
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Key words
charge recombination,photovoltaics
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