Charge-carrier dynamics in polythiophene films studied by in-situ measurement of flash-photolysis time-resolved microwave conductivity (FP-TRMC) and transient optical spectroscopy (TOS)

Autor:	Akinori Saeki, K. Ushida, Seiichi Tagawa, Takeyoshi Sunagawa, Shu Seki
Rok vydání:	2006
Předmět:	business.industry Chemistry Photoconductivity Analytical chemistry Condensed Matter Physics Optical conductivity Electric field Ultrafast laser spectroscopy Optoelectronics Charge carrier Transient (oscillation) Spectroscopy business Excitation
Zdroj:	Philosophical Magazine. 86:1261-1276
ISSN:	1478-6443 1478-6435
DOI:	10.1080/14786430500380159
Popis:	An in-situ measurement system for flash-photolysis time-resolved microwave conductivity (FP-TRMC) and transient optical spectroscopy (TOS) has been developed to perform simultaneous measurements of photo-induced changes in conductivity and charge-carrier density in an organic thin film. The electric field in the resonant cavity designed for the present system was analysed by electrostatic simulation. Using the present system and the simulated electric field, the photoconductivity and transient absorption in a regioregular poly(3-hexyl thiophene) film were measured using one particular geometry under photon excitation energies of 6.39, 4.98, 3.48, and 2.34 eV. The dynamics of photogenerated charge carriers is discussed in terms of the excitation energy and incident photon intensity. The transient absorption spectrum induced by 3.48 eV light is presented and compared with the TRMC transient.
Databáze:	OpenAIRE
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