High Photoconductive Responsivity in Solution‐Processed Polycrystalline Organic Composite Films
2011; Wiley; Volume: 21; Issue: 5 Linguagem: Inglês
10.1002/adfm.201002518
ISSN1616-3028
AutoresGerardo Hernandez‐Sosa, Nelson E. Coates, Sebastian Valouch, D. Moses,
Tópico(s)Organic Light-Emitting Diodes Research
ResumoAbstract We demonstrate a novel approach for enhancing photoconductive responsivity ( R ) using a solution‐based organic semiconductor composite that yields R approaching 25 AW −1 , which is two to three orders of magnitude higher than the R in films comprising a single molecular component. We present extensive studies of photoconductivity, photoluminescence, and crystalline structural order that elucidate the mechanisms underlying this high photoconductive responsivity. The high R is found to arise from high photoconductive gain (82) due to a long mobile hole lifetime stemming from a prolonged occupation of electrons in deep traps generated at interfacial regions between the molecular crystallites.
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