Comparative Study On Solid-state Photoelectrochemical Solar Energy Conversion Based On P3ot And P3ot Pcbm

The photoelectrochemical properties of a solid-state photoelectrochemical cell (PEC) basedrnon poly(3-octylthiophene), P3OT, and a blend of P3OT with phenyl-C61-butyric acidrnmethyl ester, PCBM, an ion-conducting polymer electrolyte, amorphous poly(ethylenernoxide), POMOE, complexed with iodine/triiodide redox couple has been constructed andrnstudied. The current - voltage characteristics in the dark and under white light illumination,rnthe dependence of the short - circuit (Isc) and the open - circuit voltage (Voc) of the tworntypes of the devices have been compared. An open-circuit voltage of 344 mV and a shortcircuitrncurrent of 0.47 μA cm-2 were obtained for the device of P3OT as a photoactivernelectrode and an open-circuit voltage of 294 mV and a short-circuit current of 4.271 μArncm-2 were obtained for the device of P3OT:PCBM at light intensity of 100 mW/cm2. Therntransient photocurrent and photovoltage, the photocurrent action spectra of the blendrnP3OT:PCBM for front and back side illuminations and an open-circuit voltage and shortcircuitrncurrent dependence on light intensity have been studied. During illumination, arncathodic photocurrent was observed, indicating that the neutral poly(3-octylthiophene)rnbehaves as a p-type semiconductor. IPCE% of 0.0682 % for front side illuminationrn(ITO/PEDOT) and IPCE% of 0.0011 % for backside illumination (ITO/P3OT:PCBM) werernobtained for the device ITO│P3OT:PCBM │POMOE:I3rn-/I-│ PEDOT│ITO.

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