CuxS(x=1-2)对电极催化活性及其对量子点敏化太阳电池性能的影响研究

量子点敏化太阳电池(QDSCs)是目前太阳电池研究领域的热点之一，使用金属硫化物CuxS（x=1-2）对电极可以大幅提高电池效率。普遍使用的金属片上Cu2S对电极存在无法控制腐蚀、封装困难、不能使用不透明的光阳极等问题；FTO玻璃上的CuxS（x=1-2）对电极普遍使用化学方法制备。 本项目提出利用简单、低成本的物理法-热蒸发法在FTO 导电玻璃上制备CuxS（x=1-2）对电极。通过改变热蒸发法的工艺条件，调节CuxS中铜/硫计量比、元素价态、电阻、表面积等，研究它们对电极催化活性的影响机理；在此基础上，研究电极催化活性对电池性能影响的微观机理，寻找影响电池高效的主要因素。本研究不但为量子点敏化太阳电池对电极的制备提供新思路，同时通过对电极催化活性及其对太阳电池效率影响等问题的研究也将为提高对电极性能及电池的光电转换效率提供科学依据。

At present, quantum dot-sensitized solar cells (QDSCs) are one of the research focuses in the field of solar cells. By using metal sulfide CuxS ( x=1-2 ) counter electrode, the photo-electrical conversion efficiency of QDSCs can be improved significantly. The most common Cu2S counter electrodes are fabricated through exposing the metal Cu foil to sulfide solution to obtain an interfacial layer of metal sulfide. The problem is that such a preparation method suffers from continual corrosion and ultimately mechanical instability. On the other hand, Cu2S counter electrodes on Cu foil limit direct applications of opaque photoanodes.CuxS ( x=1-2 ) counter electrodes on FTO glass substrates are generally prepared by chemical method. Herein, we propose a simple, low cost and physical preparation method- thermal evaporation to synthesis CuxS ( x=1-2 ) counter electrodes on FTO glass substrates. By adjusting the proceeding conditions, the Cu/S ratio, element valence, resistance, surface area of CuxS can be changed and the mechanisms of their effects on electrocatalytic activity are studied. On this basis, the microscopic mechanism of the counter electrode's electrocatalytic activity on the solar cells performance is studied to find out the main factors affecting QDSCs efficiency. This study will provide a new approach to counter electrodes preparation, and it will also provide reference to improve the performance of counter electrodes and solar cells.