Graphite-like C₃N₄ in layered structure (graphitic C₃N_4, g-C₃N₄) was introduced into CdS quantum dots sensitized solar cells (QDSCs) to improve the photovoltaic performance. The g-C₃N₄ enlarges sunlight absorption due to good response to visible light and simultaneously appropriate content g-C₃N₄ suppresses TiO₂ nanoparticle aggregation in QDSC photoanode beneficial from its layered structure. Compared with the melamine prepared g-C₃N₄, the layer thickness of g-C₃N₄ prepared from urea is smaller and the specific surface area is larger. The g-C₃N₄/TiO₂ composite for photoanode is prepared through one-step calcining the mixture of urea and TiO₂ precursors and then, the prepared g-C₃N₄/TiO₂ photoanode was deposited with CdS QDs. The results showed that g-C₃N₄ improved not only sunlight absorption, but also the efficiency of electron injection into TiO₂ photoanode. The nonlinear synergistic effect existed when g-C₃N₄ and CdS QDs served as sunlight harvester at the same time, since g-C₃N₄ and CdS formed hetero-junction in QDSCs. The urea amount in the precursor is modified to optimize photovoltaic properties of QDSCs. The mechanism of g-C₃N₄ content effect on QDSC photovoltaic performance was investigated systematically through combining photoanodes micro-structural characterization with electrochemical impedance spectrum (EIS) and current density–voltage (J-V) curve measurement.

石墨如C ₃ ñ ₄中的层状结构（石墨ç ₃ Ñ _4， GC ₃ Ñ ₄）引入的CdS量子点敏化的太阳能电池（QDSCs）来提高光伏性能。由于对可见光的良好响应，gC ₃ N ₄扩大了阳光吸收，同时适当的含量 gC ₃ N ₄抑制了 QDSC 光阳极中的TiO ₂纳米颗粒聚集，这得益于其层状结构。与三聚氰胺相比制备GC ₃ Ñ ₄，GC的层厚₃ Ñ ₄尿素制得的体积更小，比表面积更大。通过对尿素和TiO ₂前驱体的混合物进行一步煅烧，然后在制备的gC ₃ N ₄ /TiO _{2 光}阳极上沉积CdS QD ，制备用于光阳极的gC ₃ N ₄ /TiO ₂复合材料。结果表明，gC ₃ N ₄不仅提高了太阳光吸收，而且提高了电子注入TiO _{2 光}阳极的效率。gC ₃ N ₄和CdS QDs同时作为阳光收集器时存在非线性协同效应，因为gC₃ N ₄和CdS在QDSCs中形成异质结。前体中的尿素量被修改以优化 QDSC 的光伏性能。通过将光阳极微观结构表征与电化学阻抗谱（EIS）和电流密度-电压（JV）曲线测量相结合，系统地研究了gC ₃ N ₄含量对QDSC光伏性能的影响机制。