Abstract
A water soluble conjugated thiophene polymer, sodium salt of poly[2-(3-thienyl)ethoxy-4-butylsulfonate](TPP), and graphene oxide (GO) composite film (GO–TPP) device was prepared.Transient photoconductivity measurements were carried out on the GO–TPPcomposite film using 150 ns laser pulses of 527 nm wavelength. Highly efficientphotocurrent generation was observed from the GO–TPP film. The relationships of thefilm photoconductivity, photocurrent decay time and electron decay times withthe incident light intensity were investigated. The photoconductive gain of thefilm was determined to be greater than 40% and to be independent of the lightintensity. Furthermore, the femtosecond nonlinear optical properties of the GO–TPPfilm were measured using 800 nm femtosecond laser pulses and the compositefilm exhibited high nonlinear absorption and nonlinear refraction coefficients.
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