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Study on electronic transport and recombination characteristics of dye sensitized solar cells

Core tip: dye sensitized solar cell (Dye-SensitizedSolarCell, DSSC) because of its low cost, simple production process and other advantages, has attracted many scientists and entrepreneurs to conduct scientific research and industrial development. At present, DSSC has the highest photoelectric conversion efficiency

DSSC (Dye-SensitizedSolarCell) has attracted scientists and entrepreneurs all over the world for scientific research and industrial development because of their low cost and simple production process. At present, the highest photoelectric conversion efficiency of DSSC is the Swiss Gratzel group reported 12.3% ~ 3, but the photoelectric conversion efficiency and stability from the practical application demand is still far away, this is mainly due to the battery exists inside the electron transfer and charge transfer complex process, their competition and constraints, affect the battery inside. The energy conversion process. Specific performance: first, optoelectronic transmission in nano porous semiconductor film, electron diffusion to FTO substrate was collected, flow to the external circuit photocurrent, and electronic may and penetration of composite V electrolyte in porous film in the loss (called back reaction), the two process determines the competition light current size DSSC. How to strengthen the electronic transport, inhibition of back reaction is second, 1. of the focus of current research on DSSC, photoinduced electron transport in nano porous semiconductor film, the porous TiO2 nano particles in the film there are a large number of grain boundaries resulting in the defect state,. From can be seen in the visible light range of 400 ~750nm, with light anode thickness increased from 5pm to 14pm, IPCE increased gradually, but the thickness increased from 14pm to 17pm, with the increase of the thickness of IPCE decreased significantly in the 400~650nm band, basically remained unchanged in the 650 ~750nm band. The test result is basically the same as the result of short-circuit current variation in the characteristic curve 1.

3.2 optical intensity modulation of dye-sensitized solar cell flow spectrum and intensity modulated photovoltage spectroscopy (a) and (b) respectively is intensity modulated photocurrent spectroscopy (IMPS) and intensity modulated photovoltage spectroscopy (IMVS) and the imaginary part with frequency variation curve.

According to the minimum characteristic frequency in the IMPS diagram can get the transmission time Tt and electron diffusion coefficient in optical photoelectron in the anode: pay Sanling, Zhang Fu, Wei Zhiren. Hydrothermal synthesis of 02 nanorods nanorods with anatase phase 1! 1. Journal of synthetic optics, 2008, 37 (4): 10124015., Wang Lili, Yang Bingchu, Zhou Conghua, et al. Influence of hydrothermal reaction temperature on growth kinetics and photoelectric properties of TiO2 nanocrystals under alkaline conditions. Journal of synthetic crystals, 2011, 40