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Title: Temperature effect on the performance of phthalocyanine based photovoltaic devices
Authors: Kumar, Hemant
Kumar, Pankaj
Chaudhary, Neeraj
Bhardwaj, Ramil
Sharma, G D
Venkatesu, P
Chand, Suresh
Keywords: Organic photovoltaic
Electronic properties
Fill factor
Short circuit current density
Open circuit voltage
Issue Date: Oct-2010
Publisher: NISCAIR-CSIR, India
Abstract: In this paper, the effect of temperature on performance of phthalocyanine based photovoltaic devices is investigated. Zinc phthalocyanine (ZnPc) and metal free phthalocyanine (H<sub>2</sub>Pc) are used as donor whereas fullerene (C<sub>60</sub>) is used as an acceptor. Prior to these investigations, the thicknesses of the active layers are optimized to get the optimum performance. The optimised device has an efficiency of ~1.4% for ZnPc and ~0.5% for H<sub>2</sub>Pc at room temperature. Investigations on the optimized device show that temperature has significant effect on the photovoltaic performance. Short circuit current density (<i style="">J<sub>sc</sub></i>) and fill factor (<i style="">FF</i>) decrease whereas open circuit voltage (<i style="">V<sub>oc</sub></i>) increases with reduction in temperature. The reduction in <i style="">J<sub>sc</sub></i> has been attributed to the temperature dependent electronic properties of the active organic layers while the increment in the <i style="">V<sub>oc</sub></i> has been attributed to the reduction in band bending and increment in built in voltage (<i style="">V<sub>bi</sub></i>) on lowering of temperature. In overall the efficiency first increases and then decreases with reduction in temperature.
Description: 358-362
ISSN: 0975-1017 (Online); 0971-4588 (Print)
Appears in Collections:IJEMS Vol.17(5) [October 2010]

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