Preparation And Photovoltaic Performance Of Polyoxometalate/Poly (3-hexylthiophene) Solar Cells

With the depletion of fossil fuels, the utilization of solar energy has become a hotspot inthe world to solve the shortage of fossil energy. As we all know, monocry-stalline siliconsolar cells have already put into production, but its high cost, bulky and so on, so it can onlybe developed in certain areas, which makes the new solar cell research and development isimminent. Accordingly, the organic polymer solar cells have emerged, particularly poly-3-hexylthiophene (P3HT) solar cells, but it is still not ready for use. An important research topicis to improve light-to-electricityonversion efficiency of the poly-3-hexylthiophene (P3HT)solar cells. Polyoxometalates (POMs) are a kind of good electron acceptors. They cantransport photogenerated electrons in the semiconductors, which reduces the electron-holerecombination and then improves the photovoltaic response. In this paper, we prepared aseries of P3HT/POMs composite films and investigated their photovoltaic performances.1. We fabricated the solar cells of P3HT and H3PW12O40by electrochemicaldeposition.Vacuum evaporation of aluminum electrodes to prepare of solar photovoltaicdevices: ITO/PEDOT/P3HT:PW12/Al. The results showed that POMs can be formed as anelectron acceptor, effectively improve the photoelectric conversion efficiency of solar cells,whereby the POMs has become an electron acceptor material in and a star.2. POMs are a good electron transport layer material. Introduced H4P2W18O62as anelectron transport layer in the prepared structure ITO/PEDO/P3HT: PCBM/Al. We fabricatedthe solar cells: ITO/PEDO/P3HT PCBM: P2W18/Al. Test results show the power conversionefficiency of the P3HT: P2W18solar photovoltaic devices were improved by3times.3. We prepared solar photovoltaic devices ITO/PEDOT/P3HT: PCBM: P2W18/Al andITO/PEDOT/P3HT: PCBM: P2Mo18/Al to study on the photoelectrochemical performanceand types of relationships. Test results showed that P2Mo18cannot form a good match withP3HT, as a result that it cannot improve the photoelectric conversion efficiency. But P2W18can be matched with P3HT; the concentration of10-5M of P2W18can play to improve thephotoelectric conversion efficiency.