  The ideal band gap for a photovoltaic active layer for the solar spectrum is
around 1.3 eV. However oxides with such values are rare. One of the most
studied oxides to date as a photovoltaic active layer is the cuprous oxide
Cu2O. Its band gap is around 2.1 eV and is therefore not ideal for the solar
spectrum. Power Conversion Efficiency generally do not exceed 4%. In this paper
we propose to study an emerging type of solar cell that is based on
ferroelectricity. In this type of solar cell, a p-n junction is not necessarily
required, unlike conventional solar cells. Interesting conversion efficiencies
are beginning to be obtained with this type of cell, however the mechanisms are
still not well understood and several material and engineering challenges must
be addressed. The objective of this paper is to initiate an innovative
photovoltaic technology based on novel inorganic with suitable bandgap widths
and organic materials (biopolymer). These oxides are more stables. We
synthesized ferroelectric materials that absorb a large part of the solar
spectrum with reduced bandgap widths. PZN-4.5PT nanoparticles were dispersed in
a biopolymer matrix. Hybrid thin films with these inorganic nanoparticles
embedded in a biopolymer have been successfully fabricated by spin coating on
ITO substrate. Structural, morphological and electrical properties were
investigated. The best Power Conversion Efficiencies measure under a light LED
illumination of 3550 lux are respectively 21.83 % and 31.62 % for 15 and 30 min
light exposition with an open-circuit voltage of 5.17 and 5.86 V.
