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采用简易溶剂热法合成直径为150-250 nm的Cu2SnSe3纳米颗粒.以Cu2SnSe3“墨水”为前驱体采用滴落涂布法在掺氟二氧化锡基板上沉积Cu2SnSe3薄膜作为染料敏化太阳能电池(DSSC)对电极.利用场发射扫描电镜(FESEM)、透射电镜(TEM)、X射线衍射(XRD)、拉曼光谱(Raman)、能谱仪(EDS)等对Cu2SnSe3纳米颗粒的形貌、结构和组成进行表征.结果表明:产物纯净无杂项且符合化学计量比.以Cu2SnSe3为对电极的DSSC转化效率为7.75%,与铂对电极DSSC效率相当(7.21%).研究表明,DSSC的光电流密度和影响因子与Cu2SnSe3薄膜厚度密切相关,这是由于不同厚度的Cu2SnSe3薄膜作对电极所对应的催化位置数目和电阻值不同.电化学阻抗谱研究说明,Cu2SnSe3因具有类似铂良好的电催化性能而适合用作染料敏化太阳能电池对电极材料.本文以Cu2SnSe3代替贵金属铂,提供了一种廉价制备高效染料敏化太阳能电池对电极的新方法.
Cu2SnSe3 nanoparticles with a diameter of 150-250 nm were synthesized by a simple solvothermal method.Cu2SnSe3 thin films were deposited on the fluorine-doped tin dioxide substrate by a drip-coating method using Cu2SnSe3 “ink” as a dye-sensitized solar cell (DSSC) was used as the counter electrode.The morphologies of Cu2SnSe3 nanoparticles were characterized by field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectroscopy (EDS) Structure and composition were characterized.The results show that the purity of the product is uncomplicated and stoichiometric, the conversion efficiency of DSSC with Cu2SnSe3 as the counter electrode is 7.75%, which is equivalent to that of the platinum electrode DSSC (7.21%). The results show that the DSSC light The current density and the influencing factor are closely related to the thickness of Cu2SnSe3 thin films, which is due to the different catalytic sites and resistances of Cu2SnSe3 films with different thickness as the counter electrode.The electrochemical impedance spectroscopy study shows that Cu2SnSe3 has good electrocatalytic properties And is suitable for the dye-sensitized solar cell counter electrode material.In this paper, Cu2SnSe3 instead of the noble metal platinum, provided a cheap method for preparing high efficiency dye-sensitized solar cell counter electrode.