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

Influence of ZnO CSHMS on photovoltaic performance of CdSe/CdS 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;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。

Carbonaceous microspheres templates were prepared by hydrothermal process using sucrose solution.Zn;precursor was absorbed onto surface of carbonaceous microspheres due to affinity of the microspheres,and ZnO core/shell hollow microspheres(CSHMS)were successfully prepared by controlling heating rate of 2℃/min during the subsequent annealing process.The structure,composition and formation mechanism of ZnO CSHMS were analyzed based on results of scanning electron microscope(SEM),transmission electron microscope(TEM),energy dispersive spectrum(EDS),and infrared spectrum(FT-IR).The influence of ZnO CSHMS on photovoltaic performance of CdSe/CdS quantum dots sensitized solar cell(QDSSC)was further investigated.In comparison with ZnO hollow microspheres(HMS),the application of ZnO CSHMS can improve short-circuit current density(J_(sc))from 5.03 mA/cm^(2) to 8.47 mA/cm^(2),the power conversion efficiency reached 2.10%,which increased by nearly one time compared with QDSSC based on ZnO HMS.The incident photon-to-current conversion efficiency(IPCE)and corresponding integrated J_(sc) analysis were conducted to prove that ZnO CSHMS could enhance light harvesting efficiency in terms of quantum dots adsorption and light pathways,leading to the increase of J_(sc),and finally improving the photovoltaic performance of QDSSC.