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Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.49 [2011] >
IJPAP Vol.49(08) [August 2011] >
| 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
Fluorescence
Quenching |
| 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. |
| Page(s): | 557-562 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
| Source: | IJPAP Vol.49(08) [August 2011]
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