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.
