The Study Of Mesoscopic Solar Cells Based On The Transparent Mesoporous Counter Electrode

Mesoscopic solar cell (MSC) is one of new kinds of solar cell using mesoporous structure for light capture and charge separation. Dye-sensitized solar cell (DSSC) is a typical MSC. Since M. Gratzel firstly introduced the mesoporous TiO2nanocrystalline structure in1991, DSSC has attracted extensive attention from the researchers. Up to now, it has achieved a certified efficiency of11.9%. Compared with conventional solar cells, DSSC possesses simpler preparation process, lower raw material prices, better stability, which attract researcher’attention.As the rapid development of DSSC, more and more institutions and companies are working on the commercialization of DSSC. In consideration of the special characteristics of DSSC, the building integrated photovoltaics (BIPV) with DSSC is an important direction of the application. Therefore, in this thesis, we developed a fully printable bifacial transparent liquid DSSC based on indium tin oxide (ITO) mesoscopic film. The first fully printable solid-state DSSC based on ITO mesoporous structure has also been fabricated. Moreover, we successfully employed the transparent mesoporous ITO electrode in the perovskite solid-state mesoscopic solar cell, which lie a foundation for further research and application of transparent or tandem perovskite solar cells. At last, we have optimized the photoanode based on different sized TiO2nanoparticles in the mesoporous perovskite solar cells and achieved photoelectric conversion efficiency of13.41%.The main contents of the paper include:We have synthesized cubic ITO nanoparticles and fabricated transparent conducting ITO slurry. Experimental results show that the transmittance of single-layer ITO mesoporous film is up to80%and the resistivity of the ITO film is as low as0.247±0.004Ω·cm.We have successfully fabricated mesoporous bifacial transparent liquid DSSCs. In the cells, an ITO-Pt transparent film was used as the counter electrode, which was prepared by a thermal decomposition of H2PtCl6solvent in mesoprous ITO film. An efficiency of3.26%was achieved. Experiments show that mesoporous ITO-Pt counter electrode can keep good catalytic activity and greatly reduce the exchange resistance between the electrode and the electrolyte, which will improve the photoelectric conversion efficiency of the cell.With a fully printable method, we have successfully fabricated bifacial transparent solid-state DSSC based on ITO mesosporous film. By optimizing the thickness of the ITO electrode, we have achieved an efficiency of1.73%from the front side and an efficiency of1.06%from the rear side under standard irradiation conditions.We have successfully fabricated perovskite mesoscopic solar cells based on transparent ITO eounter electrode. Using a new perovskite (5-AVA)x(MA)1-xPbI3instead of CH3NH3PbI3, an efficiencny of7.6%was achieved in the (5-AVA)x(MA)1-xPbI3mesoscopic solar cell based on mesoporous transparent ITO electrode.We have optimized mesoporous TiO2photoanode material of mesoscopic solar cells based on (5-AVA)x(MA)1-xPbI3and carbon counter electrode. Experimental results show with25nm sized TiO2nanoparticle,(5-AVA)x(MA)1-xPbI3baesd mesoscopic solar cells achieved optimized efficiency. In addition, we also have an in-depth study and discussion for nanocrystalline TiO2particle size effects in the mesoscopic solar cells.