The Studyof Dye Sensitized Solar Cell With The Photoanode Prepared By Electrospray

Dye sensitized solar cell(DSSC) is a new type of photovoltaic device. Owning to the merit of high energy conversion performance, low cost and eco-benigh manufacture process, DSSC has become one of focus in fields of photovoltaic. As the working electrode, photoanode is the heart component determining the photocoltaic efficiency. The surface features, such as particle size and shape, structural stability, as well as porosity, are all important factors directly relevant to the performance of DSSC. In this thesis, we mainly study the Ti O2 photoanode of DSSC by electrospray(E-spray)method and the corresponding DSSC device. The main attributions of this thesis are as fllow:(1)The Ti O2 photoanode are prepared by E-spray method, and the preparation situations are investigated and optimized. By adjusting the E-spray height, time and slurry concentration, the best result of photoanode is obtained. The highest efficiency is 7.03%.(2)A series of Ti O2–graphene stacked photoanodes for dye-sensitized solar cells(DSSCs) are fabricated by E-spray deposition. The working princip les are analyzed by scanning electron microscopy, transmittance spectra, electrochemical impedance spectroscopy and incident-photo-conversion efficiency data. We find that although graphene layers incorporated in Ti O2 slightly decrease dye adsorption, they are able to significantly improve the electron transport in the photoanode, and the charge recombination at the interfaces of Ti O2 electrolyte are greatly suppressed, leading to dramatic improvement in power conversion efficiency. When inserting three layers of pure graphene into the Ti O2 photoanode, high efficiency of 8.9% is obtained. Two new materials were used as photoanode and study their performance in DSSC. It was shown that the short circuit current of two materials were high, but open circuit voltage were poor.(3)DSSC device based on four new organic dyes were fabricated. CI and CBR were selected as co-sensitized dye with the conventional dye N719 and proved the power conversion efficiency improved.