Title: Photoconductivity induced by wire-to-spacer charge-transfer transitions in an inorganic-organic hybrid quasi-one-dimensional crystal: Polaron excitation in the Urbach tail
Abstract: Photocurrent excitation spectra have been measured as a function of applied electric field and temperature with crystals of an inorganic-organic hybrid quasi-one-dimensional compound, methylviologen lead iodide, which consists of lead iodide chains and methylviologen spacer molecules. Photocurrent is induced dominantly by charge-transfer transitions from the lead iodide chains to methylviologen in the energy region between 2.1 and $\ensuremath{\sim}2.7\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$. Furthermore, the photoconductivity parallel to the inorganic chains is enhanced remarkably in the low-energy absorption tail of the charge-transfer transition, but not for the perpendicular current direction. It is revealed that the photocurrent enhancement is associated with the excitation in the Urbach tail of the charge transfer transition, which gives rise to electrons localized on methylviologen and hole polarons in the lead iodide chains. The photoconductivity enhancement is discussed and explained by the one-dimensional transport of photocreated hole polarons.
Publication Year: 2005
Publication Date: 2005-09-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 20
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