Comparative Study on Solid-State Photoelectrochemical Solar Energy Conversion Based on P3ot and P3ot: Pcbm
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Date
2010-06
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Addis Ababa Universty
Abstract
The photoelectrochemical properties of a solid-state photoelectrochemical cell (PEC) based
on poly(3-octylthiophene), P3OT, and a blend of P3OT with phenyl-C61-butyric acid
methyl ester, PCBM, an ion-conducting polymer electrolyte, amorphous poly(ethylene
oxide), POMOE, complexed with iodine/triiodide redox couple has been constructed and
studied. The current - voltage characteristics in the dark and under white light illumination,
the dependence of the short - circuit (Isc) and the open - circuit voltage (Voc) of the two
types of the devices have been compared. An open-circuit voltage of 344 mV and a shortcircuit
current of 0.47 μA cm-2 were obtained for the device of P3OT as a photoactive
electrode and an open-circuit voltage of 294 mV and a short-circuit current of 4.271 μA
cm-2 were obtained for the device of P3OT:PCBM at light intensity of 100 mW/cm2. The
transient photocurrent and photovoltage, the photocurrent action spectra of the blend
P3OT:PCBM for front and back side illuminations and an open-circuit voltage and shortcircuit
current dependence on light intensity have been studied. During illumination, a
cathodic photocurrent was observed, indicating that the neutral poly(3-octylthiophene)
behaves as a p-type semiconductor. IPCE% of 0.0682 % for front side illumination
(ITO/PEDOT) and IPCE% of 0.0011 % for backside illumination (ITO/P3OT:PCBM) were
obtained for the device ITO│P3OT:PCBM │POMOE:I3
-/I-│ PEDOT│ITO.
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Keywords
photoelectrochemical