The Semiconductor-like Properties Of Polyoxometalates And Promoting Photoelectric Conversion In Phthalocyanine Photoelectrode

The overgrowth population and the development of society need more energy productionresources. Traditional energy sources have been unable to meet human needs. We are lookingfor a kind of green environmental protection of clean energy. Solar energy having its ownadvantages is a kind of inexhaustible and clean power. Polyoxometalates（POMs） Has becomea hot research topic in recent years because of its rich types,unique structures anddesignability. The properties of transport and storage electrons make POMs becoming animportant candidate of photoconductive materials. In this paper, we focus on the preparationof nanocomposite film containing POMs, phthalocyanine, Heteropoly Blue and inorganicsemiconductor materials by self-assembly technology. Furthermore, the synergic effect andsemiconductivity of POMs on photovoltaic activities for the nanocomposite film electrodeswere investigated.The P₂Mo₁₈/CuTAPc film shows a higher photocurrent response and η than thePMo₁₂/CuTAPc film for reducing the fast charge pair recombination by POMs. The sameresults have been observed that the film electrode of P₂Mo₁₈still displays higher photoelectricresponse as NiTAPc was replaced by CuTAPc. These results demonstrated that theintroduction of different POMs into phthalocyanine materials is effective approach toenhance the light-to-electricity conversion efficiency. By this strategy, the combination ofunique POMs can be developed with enhanced functionality in harvesting and utilization ofsolar energy and designed new organic photovoltaic devices.The P₂Mo₁₈/CuTAPc film shows a higher photocurrent response and η than the HeteropolyBlue/CuTAPc film for reducing the fast charge pair recombination by POMs. These resultsdemonstrated that the introduction of different POMs and Heteropoly Blue intophthalocyanine materials is effective approach to enhance the light-to-electricity conversionefficiency. By this strategy, the combination of unique POMs can be developed withenhanced functionality in harvesting and utilization of solar energy and designed new organicphotovoltaic devices.We focus on the preparation of nanocomposite film containing POMs inorganicsemiconductor materials by self-assembly technology to investigate POMs on photovoltaicactivities. Several types of POMs(PMo₁₂、GeMo₁₂、SiMo₁₂、PW₁₂、GeW₁₂、SiW₁₂、P₂Mo₁₈and P₂W₁₈) all have produced weak photocurrent when they are illuminated. Characterizationof photoelectric properties of semiconductor by surface photovotage spectroscopy andUV-visible diffuse reflectance spectroscopy were investigated on POMs.