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Title: Hybrid nano-crystalline TiO2 solar cell with copper phthalocyanine as sensitizer and hole transporter
Authors: Rajkumar
Sharma, G D
Roy, M S
Keywords: Bulk heterojunction
Photovoltaic effect
Issue Date: Aug-2011
Publisher: NISCAIR-CSIR, India
Abstract: Bulk heterojunction photovoltaic devices based on blends of copper phthalocyanines as electron donor and crystalline nc-TiO2 nanoparticles as electron acceptor have been studied. Compositions of nc TiO2:CuPc films are cast from a common solvent mixture. In this device, CuPc has been used both as sensitizer and electron donor. The photoinduced charge transfer composite thin film structure is predicted on the basis of its optical behaviour, photo action spectra and fluorescence spectra, supported by current – voltage characteristics in dark and under illumination. The increase in photocurrent in composite is justified in terms of the formation of bulk heterojunction between CuPc and TiO2 nanoparticles. The photovoltaic effect in the device made by sandwiching the active nc-TiO2:CuPc layer between Al and ITO electrodes, has been studied as a function of the TiO2 concentration. The experimental results support that the photoinduced photogeneration of charge carriers is induced by the production of excitons and their subsequent efficient dissociation into free carriers at increased TiO2:CuPc (D-A) interface, which is spread over the whole bulk region sandwiched between Al and ITO. The capacitance-voltage characteristics of the device also support the formation of bulk heterojunction between CuPc and TiO2.
Description: 557-562
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.49(08) [August 2011]

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