Fabrication and characterization of CuPc and PCBM based organic solar Cell

Abstract

Organic solar cells have potential as an alternative to conventional inorganic solar cell due to low processing cost, flexibility and easy fabrication technique. The goal of this paper is to study the characteristics of the CuPc and PCBM based organic solar cell and traps identification by introducing a thin layer of Ag at the interface of donor (CuPc) and Acceptor (PCBM), their photovoltaic and optical properties were investigated. The heterojunction solar cells with silver inter layer and without silver were fabricated through thermal deposition in HR vacuum. The OPV solar cells were characterized using current-voltage graphs, absorbance spectrum and Impedance spectroscopy. Impedance spectroscopy was taken to identify these traps using series resistance, parallel resistance, and Impedance spectrums under different frequencies and optical behaviors of these devices have been investigated with absorbance spectrum.Introducing Ag to interfacing point decreased Voc, Isc, FF, and efficiency due to generation of charge traps by Silver. And these traps were identified using IS, series and parallel resistance. The effect of donor/ acceptor and silver interlayer thicknesses was also studied.