Introduction - Simple recombination model; Carrier generation due to light. Recombination of electrons and holes is a process by which both carriers annihilate. CARRIER GENERATION, RECOMBINATION, AND TRANSPORT IN ORGANIC CRYSTALS Martin Pope New York University, Chemistry Department, New York Charles E. Swenberg Armed Forces Radiobiology Research Institute, Bethesda Various mechanisms of carrier generation in organic crystals are reviewed.
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Semiconducting single-walled carbon nanotubes (s-SWCNTs) are promising for solution-processed, thin film photovoltaics due to their strong near-infrared absorptivity and excellent transport properties. We report on the generation yield and recombination kinetics of free charge carriers in photoexcited thin films of polymer-wrapped s-SWCNTs with and without an overlying electron-accepting C 60 layer, using time-resolved microwave photoconductivity (TRMC). Free carriers are generated in neat s-SWCNT films, even without an obvious driving force for exciton dissociation. However, most carriers recombine in 1.3 cm 2 V –1 s –1. These studies improve understanding of s-SWCNT photoresponses in solar cells and photodetectors.
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