Photovoltaic devices organic-inorganic hybrids

Korgel et al synthesised nanociystals of iron sulfide (FeS2) Pyrite phase form solvent based dispersions, or solar paint, to fabricate photovoltaic devices (PVs). The XRD and Raman spectroscopy confirmed the pyrite composition and phase purity of the nanocrystals. These nanociystals were sprayed onto substrates as absorber layers in devices with several different architectures, including Schottlqi barrier, heterojunction, and organic/inorganic hybrid architectures, to explore their viability as a photovoltaic material. None of the devices exhibited PV response whereas the electrical conductivity of the nanocrystal films was about 4-5 Scm . This lack of PV response appears to derive from the highly conductive surface-related defects in pyrite that have been proposed. 

PPV precmsor (Table 1) precipitated sihca and did not gel, but the silica produced did not have a well-defined structure. However, the ability of PPV to precipitate silica and not gel can be used. The precipitate can be dried and can be powdered for suitable applications in photovoltaic devices. The precipitate, when left in a test tube, was seen to change its color from white to light blue in 3-5 days and then to bluish green in 5-7 days. The conversion of the PPV precursor to PPV within the inorganic-organic hybrid system and the optical properties of this hybrid are currently being investigated. 

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