Poly(2,2-bithiophene)/titania Hybrid Solar Cells Prepared by Electrochemical Polymerization
Date Issued
2008
Date
2008
Author(s)
Lan, Pei-Yu
Abstract
A series of novel organic/inorganic hybrids solar cells were fabricated and investigated. Various thicknesses of TiO2 films were coated on top of FTO glass by spin-casting using different concentrations of TiO2 colloids that synthesized by sol-gel method. This study developed an electrochemical polymerization route for preparing organic/inorganic hybrids for use as photoactive materials in photovoltaic devices. This new technique was benefited from the ability of using non-soluble conjugated polymers as major photoactive component in solar cells. Moreover, the monomer can be polymerized from the interstices of TiO2 matrices due to their much smaller size in comparison to the corresponding polymer, thus substantially increasing the donor-acceptor interface for exciton dissociation. The effect of titania film thickness on the performance of the photovoltaic cells constructed from these materials was examined. An approximate thickness of 165 nm of TiO2 exhibited an optimal cell performance with a short-circuit current, an open-circuit voltage, a fill factor and a power conversion efficiency of 0.171 mA/cm2, 0.42 V, 0.48 and 3.44E-2 %, respectively. Additionally, 2-thiophenecarboxylic acid was employed as a surface modifier to alter the TiO2 surface from hydrophilic to hydrophobic. The devices with 2-thiophenecarboxylic acid had an optimal short-circuit current, open-circuit voltage, fill factor and power conversion efficiency of 0.09 mA/cm2, 0.47 V, 0.48 and 2.02E-2 %, respectively. Although the cell performance was not improved, the Voc was slightly increased, revealing that surface modifier certainly ameliorated the interface properties of organic/inorganic.
Subjects
electrochemical polymerization
solar cells
titania
surface modifier
SDGs
Type
thesis
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