【作者】 张旭；

【导师】 郑威；

【作者基本信息】 哈尔滨理工大学 ， 材料物理与化学， 2023， 硕士

【摘要】 量子点敏化太阳能电池（quantum dot sensitized solar cells,QDSCs）是第三代太阳能电池的其中一种,这类电池因其具有制作成本低、组装方便、对环境友好并且理论效率高等优点从而使其研究较为广泛。量子点（quantum dots,QDs）作为电池中的光敏剂具有很多优点,譬如多激子效应、摩尔消光系数高以及带宽可调节等。本文选取Ag₂S和Bi₂S₃这两种绿色环保的量子点作为光敏剂,并且探究不同沉积量对于量子点敏化太阳能电池光电性能的影响。石墨烯因其本身独特的二维结构,具有很高的比表面积理论值,且载流子迁移率高。因石墨烯良好的结构性能使得纳米Ti O₂在其表面的高效负载、光子在半导体中的充分吸收以及光生载流子的有效分离提供了潜在的条件。本文采用还原氧化石墨烯（reduced graphene oxide,r GO）与Ti O₂进行复合对光阳极进行改性实验,探究对于QDSCs性能的影响。探究不同质量分数比的rGO/TiO₂复合光阳极对于量子点敏化太阳能电池的性能影响。制备量子点敏化rGO/TiO₂光阳极,并将此光阳极组装成QDSCs。结合微观形貌表征,紫外可见吸收光谱,电化学阻抗（EIS）和电流-电压（J-V）曲线的测试结果对试样进行了系统的结构与性能分析,结果表明在量子点敏化光阳极的结构中,r GO的引入可以抑制光电子的复合效应,从而实现有效的电荷转移。并且在rGO/TiO₂的质量分数比为0.6%时太阳能电池的光电转换效率（PCE）达到最高为2.55%,相比于单一的Ti O₂光阳极的1.32%提升了93%。探究不同沉积层数的Ag₂S/Bi₂S₃量子点对于QDSCs性能的影响。对制备的QDSCs进行结构形貌表征以及光电性能分析,本文证明了沉积两层Ag₂S/Bi₂S₃量子点光电转换效率最高,达到了2.61%。更多还原

【Abstract】 Quantum dot sensitized solar cells（QDSCs）are the third generation of solar cells,which are widely studied because of their low production cost,easy assembly,environmental friendliness and high theoretical efficiency.Quantum dots（QDs）have many advantages as photosensitizers in batteries,such as the multiple exciton effect,high molar extinction coefficient,and adjustable bandwidth.In this paper,two green quantum dots,Ag₂S and Bi₂S₃,were selected as photosensitizers,and the effects of different deposition amounts on the photoelectric performance of quantum dot-sensitized solar cells were explored.Because of its unique two-dimensional structure,graphene has a high theoretical surface area and high carrier mobility.Due to the good structural properties of graphene,the efficient loading of nano-Ti O₂on its surface,the full absorption of photons in semiconductors and the effective separation of photogenerated carriers provide potential conditions.In this paper,reduced graphene oxide（r GO）and Ti O₂were used to modify the photoanode to explore the effect on the performance of QDSCs.The effect of rGO/TiO₂composite photoanodes with different mass-fraction ratios on the performance of quantum dot-sensitized solar cells was explored.Quantum dot-sensitized rGO/TiO₂photoanodes were prepared and assembled into QDSCs.Combined with the micromorphology characterization,UV-Vis absorption spectroscopy,electrochemical impedance（EIS）and current-voltage（J-V）curve test results,the structure and performance of the sample were systematically analyzed,and the results showed that the introduction of r GO could inhibit the recombination effect of photoelectrons in the structure of quantum dot-sensitized photoanode,thereby achieving effective charge transfer.And when the mass fraction ratio of rGO/TiO₂is 0.6%,the photoelectric conversion efficiency（PCE）of solar cells reaches the highest 2.55%,which is 93%higher than the 1.32%of a single Ti O₂photoanode.The influence of Ag₂S/Bi₂S₃quantum dots with different deposition layers on the performance of QDSCs was explored.The structure and morphology characterization and photoelectric properties of the prepared QDSCs were analyzed.The paper shows that the photoelectric conversion efficiency of the deposited two layers of Ag₂S/Bi₂S₃quantum dots is the highest,reaching 2.61%.更多还原