“…Organic photovoltaic devices are promising candidates for renewable sources of electrical energy because of ease in fabrication and low production cost as well as light weight and flexibility [11][12][13][14]. Photodiodes based on polythiophene and its derivates organic semiconductors and different organic-inorganic heterojunctions such as pyronine-B/Si, β-carotene/Si, chitin/n-Si and poly[2-methoxy, 5-(2 -ethyl-hexyloxy)--1,4-phenylenevinylene] (MEH-PPV)/p-Si, 4-tricyanovinyl-N,N-diethylaniline/p-Si, Al/p-Si/copper phthalocyanine, chitosan/n-Si, organic/inorganic Schottky, FSS/n-Si, NiPc/p-Si, Zn(Phen)q/p-Si and ddq/p-Si have been fabricated and their electronic properties have been investigated [15][16][17][18][19][20][21][22][23][24]. The prospect of being able to generate electricity from sunlight has fuelled intensive research in inorganic and more recently in organic photovoltaics [25].…”