Study On Preparation Of Carbon Materials For Solar Cell Electrode

Dye-sensitized solar cells(DSSC) is a new type of photoelectric chemical solar cell withsimple preparation procedure, low cost, stable photo-to-electric performance and friendlyenvironment action, which make it a good alternative of photo-to-electric devices, and it isconsidered a landmark in the research of solar cell，ever since it firstly came into being．It is acomplex system consists of three parts, namely a photoelectrode of dye sensitizednanocrystalline TiO2, electrolyte, and a counter electrode. Counter electrode serves to transferelectrons from external circuit to triiodide and iodine in the redox electrolyte. Currently, alayer of platinum coated on transparent conducting oxide substrate is widely used as counterelectrode in DSSC.This is not economy way for mass production. Carbonaceous materials arequite attractive to replace platinum due to their high electronic conductivity, corrosionresistance towards I2. high reactivity for triiodide reduction and low cost.Activated carbon, carbon black, graphite and fullerenes(C60), are used to prepare thecarbon electrode of the dye-sensitized solar cells by the approaches of screen printing andelectrodeposition. Screen printing method is a more mature preparation process.Electro-deposition method is a process of preparation of solar cells on the electrode when theouter voltage is28V and the water bath temperature is65℃,0.5g carbon power added to theCH3COCH310ml, C2H5OH15ml, Al2(SO4)31g, PEG40015ml.The surface morphology ofcarbon films were characterized by scanning electron microscopy. The parameters withshort-circuit photocurrent (Isc), open-circuit voltage (Voc) and the fill factor(ff) of the solarcells were tested.From the parameters of the properties, it is found that the amount of polyglycol and thewater bath temperature of electro-deposition have a great influence on the photoelectricproperties of the carbon films. It shows that there are higher photoelectric properties whichare Isc8.141mA,Voc756mV and ff0.4692for the solar cell under the condition of polyglycol15ml and the water bath temperature of electro-deposition65℃.what’s more, the resultshowed that the thickness and the sintering temperature of carbon films had a great influenceon the photoelectric properties of counter electrodes. The caron films with a thickness of 27nm sintered at temperature of400℃had higher photoelectric properties with Isc7.77mA,Voc748mV and ff0.5467for the solar cell. The carbon films prepared by depositionof the biggest advantages of carbon membrane on the glass substrate adhesion is the best. Thisis a screen-printing technology can not match. Prepare carbon counter electrode withelectro-deposition method will be great prospects for development. Experiments show thatactivated carbon is a porous structure which has good catalytic activity, electrode andelectrolyte can increase the effective contact area and improve the electrochemicalactivity,and is the preparation of solar cells on the electrode material of choice.Fullerene C60is a new type of carbon material, which is three-dimensional structure, C60easily afterlight-induced electron-hole pairs resulting in the formation of electron transfer, and has a goodelectronic transport properties and electronic affinity, and alkali metal atoms combine to dosuper-guide materials. Fullerene C60which is solar cells on the electrode material has a verybright future.