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High Photoconductive Responsivity in Solution‐Processed Polycrystalline Organic Composite Films
Author(s) -
HernandezSosa Gerardo,
Coates Nelson. E,
Valouch Sebastian,
Moses Daniel
Publication year - 2011
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201002518
Subject(s) - photoconductivity , responsivity , materials science , crystallite , optoelectronics , organic semiconductor , semiconductor , photoluminescence , photodetector , metallurgy
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.