Abstract
The photoelectrical properties of p-n junction organic solar cells based on C60 and phthalocyanines (mainly oxotitanium (IV) phthalocyanine (OTiPc)) were investigated. With the Al/C60/OTiPc/ITO configuration, the energy conversion efficiencies (η) are high at low incident light intensities (pin), due to the formation of a p-n junction between C60 and OTiPc, but decrease with an increase in pin. On the other hand, ITOC60OTiPcCr·Au cells are stable even under white-light illumination at high pin. It was found that the insertion of an SiO2 insulator layer between OTiPc and Cr· Au significantly enhances the short-circuit current, the open-circuit voltage and η.
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