Recently, various phases of Cu_xS (1≤ x ≤ 2) were extensively explored as superb counter electrode (CE) materials for quantum dot-sensitized solar cells (QDSSCs). Herein, hexagonal covellite CuS (HC-CuS) with hierarchical nanostructure was grown on porous Ti substrates by chemical bath deposition, and then heat treated in the temperature range of 150 to 450 °C under N₂ atmosphere. The reaction process and the evolution of morphology, composition and crystalline structure of Cu_xS with the variation of heat treatment temperature were studied by XRD, SEM, EDX, TEM and XPS. The photovoltaic properties of TiO₂/CdS/CdSe QDSSCs based on Cu_xS CEs showed an obvious dependence on the element stoichiometry and crystalline structure of the Cu_xS. With HC-Cu_1.28S heat-treated at 230 °C as CEs, QDSSCs achieved a power conversion efficiency of 3.88% under one sun illumination (100 mW cm^-2, AM 1.5 G), which was higher than the counterparts with other compositions. Electrochemical impedance spectroscopy, Tafel polarization and cyclic voltammetry measurement showed that the electrocatalytic activity of HC-Cu_1.28S CE was much higher than that of other Cu_xS CEs, which supported the results of the enhanced short-circuit current density, open circuit voltage and filling factor.

近年来，作为量子点敏化太阳能电池（QDSSCs）的极好对电极（CE）材料，人们广泛探索了Cu _x S（1≤x≤2）的各种相。在此，通过化学浴沉积在多孔Ti衬底上生长具有分级纳米结构的六方角铝CuS（HC-CuS），然后在N ₂气氛下在150至450℃的温度范围内进行热处理。通过XRD，SEM，EDX，TEM和XPS研究了Cu _x S的反应过程以及形貌，组成和晶体结构随热处理温度的变化。基于Cu _x的TiO ₂ / CdS / CdSe QDSSCs的光电性能S CEs对Cu _x S的元素化学计量和晶体结构有明显的依赖性。通过在230°C下热处理HC-Cu _1.28 S作为CEs，QDSSC在一个阳光照射下（100）的功率转换效率为3.88％。 mW cm ^-2，AM 1.5 G），高于其他成分。电化学阻抗谱，Tafel极化和循环伏安法测量表明，HC-Cu _1.28 S CE的电催化活性远高于其他Cu _x S CE，这证明了短路电流密度，开路电压提高的结果。和填充因子。