Optimization Of Flexible Carbon Counter Electrode For Solar Cells

As a stable clean energy,solar energy has become one of the most important green energy sources developed by human beings.The photovoltaic cell semiconductor materials currently studied include silicon cells,inorganic compound batteries,dyesensitized cells,quantum dot solar cells,etc.In recent years,flexible devices have become a research hotspot,and carbon materials are applied to flexible electrodes to achieve the purpose of low material cost.This thesis focuses on solar cells:1.Optimization research was conducted on the flexible carbon counter electrode for dye sensitized solar cells(DSSCs),and AgNW/polymer flexible conductive substrates were prepared for DSSCs.The preparation process of AgNW thin films was optimized.Two types of flexible substrates were prepared,one using unidirectional rolling coating to prepare AgNW films,and the other using orthogonal rolling coating to prepare AgNW films.The conductivity and transparency of AgNW flexible substrates prepared by two different methods were investigaed.2.Flexible carbon counter electrodes were fabricated and improved.Carbon films were prepared on top of AgNW/polymer to obtain flexible carbon counter electrodes.The carbon material was improved by mixing with polystyrene spheres and firing.The optimized carbon/AgNW/polymer carbon counter electrode achieved a photoelectric conversion efficiency of 5.17%.3.Photoanode optimization of quantum dot sensitized solar cells(QDSSCs)was carried out.The composite semiconductor oxide of ZnO nanorods and ZnO inverse opal was prepared used in the photoanode together with Cd S/Cd Se quantum dot sensitizers.The QDSSCs achieved a maximum photoelectric conversion efficiency of 7.62%,and with further interface modification,the photoelectric conversion efficiency was improved to 11.38%.