ZnO核壳空心微球对CdSe/CdS量子点敏化太阳能电池的性能影响

Carbon-containing microsphere templates with a size of about 800 nm were prepared by a hydrothermal reaction using a sucrose aqueous solution. The Zn~(2+) precursor was adsorbed on the surface of the carbon-containing microsphere templates through the adsorption effect of the templates. Subsequently, ZnO core-shell hollow microspheres (CSHMS) were prepared by controlling the heating rate at 2 °C/min during the sintering process. The structure, composition and formation principle of the ZnO core-shell hollow microspheres were analyzed by means of scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), infrared spectroscopy (FT - IR), etc. The influence of the ZnO core-shell hollow microspheres on the photovoltaic performance in the application of CdSe/CdS quantum dot-sensitized solar cells (QDSSC) was further investigated. The results show that compared with ZnO hollow microspheres, the ZnO core-shell hollow microspheres increase the short-circuit current J_(sc) from 5.03 mA/cm~2 to 8.47 mA/cm~2, and the cell efficiency reaches 2.10%, which is nearly doubled. The analysis of the incident photon-to-current conversion efficiency (IPCE) and its integral J_(sc) shows that the ZnO core-shell hollow microspheres can significantly improve the light-harvesting efficiency from two aspects of quantum dot adsorption and light path transmission by using the core-shell structure, promote the increase of J_(sc), and then improve the photovoltaic performance of QDSSC.

利用蔗糖水溶液经水热反应制备了尺寸约800nm的含碳微球模板,通过含碳微球模板的吸附作用在其表面吸附了Zn~(2+)前驱体,随后在烧结过程中通过控制升温速度为2℃/min制备了ZnO核壳空心微球(CSHMS)。根据扫描电镜(SEM)、透射电镜(TEM)、能谱(EDS)、红外光谱(FT-IR)等手段分析了ZnO核壳空心微球的结构、组成和形成原理。进一步考察了ZnO核壳空心微球在CdSe/CdS量子点敏化太阳能电池(QDSSC)应用中对光伏性能的影响。结果表明:与ZnO空心微球对比,ZnO核壳空心微球使短路电流J_(sc)从5.03mA/cm~2提高到8.47mA/cm~2,电池效率达到2.10%,提高了近1倍。光电转化效率(IPCE)及其积分J_(sc)分析表明ZnO核壳空心微球利用核壳结构能够从量子点吸附和光路传输两个方面大幅提高光捕获效率,促进J_(sc)的提高,进而提高QDSSC的光伏性能。