Continuous wave photoinduced

A similar absorption bands have been reported for a regioregular P3HT pristine film by continuous wave photoinduced absorption (PIA) measurements at 10 K. The PIA spectrum exhibits an absorption peak around 990 nm and was assigned to localized polarons in the disordered portions of the film. Similar rapid decays were observed for the other polythiophene pristine films. Thus, these rapid decays are ascribed to the charge recombination of polaron pairs formed in the pristine film. 

Absorption spectra were recorded using a GBC 911/A UV-vis spectrophotometer. For most of the continuous-wave experiments an AMKO LTl photolysis apparatus (containing a high-pressure 200-W Xe-Hg lamp and a monochromator) was applied. For irradiation of bromomercurate(II) complexes (2ir=253.7 nm), a low-pressure 16-W mercury-arc lamp was used. The light intensity was measured by ferrioxalate actinometry [15] and frequently checked by a thermopile. The experimental results were processed and evaluated by Quattro and Microsoft Excel programs on personal computers. The quantum yields for the formation of BrJ were determined from the initial rates of the photoinduced reactions, following the spectral changes. 

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