Abstract Water-soluble Cu2-xSe (x = 0.2) nanoparticles (NPs) were synthesized by an eco-friendly modified chemical co-precipitation method at 70 °C within a short reaction time of 15 min using ascorbic acid. Cu2-xSe NPs showed pseudo-spherical and hexagonal shapes with sizes in the range of 20–50 nm. XRD analysis showed cubic structure to Cu2-xSe NPs. Thin films of Cu2−xSe were deposited by drop-casting the synthesized Cu2-xSe NPs solution using polyvinylpyrrolidone binder and their physical properties were investigated. The annealed Cu2-xSe NPs thin film showed a direct optical band gap of 1.82 eV and an indirect band gap of 1.69 eV. Hall Effect measurements of the annealed films showed p-type conductivity with a carrier concentration of 3.18 × 1019cm−3, resistivity of 1.31 × 10−1 Ω-cm, and hole mobility of 1.5 cm2/V-s. In order to investigate the potential of Cu2-xSe NPs as an absorber, solar cells with a device configuration of soda-lime glass (SLG)/Mo/Cu2-xSe NPs/CdS/i-ZnO/Al:ZnO/Ni/Ag were fabricated and tested, which showed a power conversion efficiency (PCE) of 0.095%. Even though the Cu2-xSeNPs solar cell showed low PCE, the use of environmentally benign reducer like ascorbic acid offers the benefit of eco-friendliness and compatibility of water-soluble Cu2-xSe NPs synthesis, and its ultimate use in solar cell as well as other applications.

中文翻译：

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用于光伏应用的水溶性 Cu2-xSe 纳米粒子的简便环保合成

摘要 水溶性 Cu2-xSe (x = 0.2) 纳米粒子 (NPs) 通过环保的改良化学共沉淀法在 70 °C 和 15 分钟的短反应时间内使用抗坏血酸合成。Cu2-xSe NPs 呈伪球形和六边形，尺寸范围为 20-50 nm。XRD 分析表明 Cu2-xSe NPs 为立方结构。通过使用聚乙烯吡咯烷酮粘合剂滴注合成的 Cu2-xSe NPs 溶液来沉积 Cu2-xSe 薄膜，并研究了它们的物理性质。退火的 Cu2-xSe NPs 薄膜显示出 1.82 eV 的直接光学带隙和 1.69 eV 的间接带隙。退火薄膜的霍尔效应测量显示 p 型导电性，载流子浓度为 3.18 × 1019cm-3，电阻率为 1.31 × 10-1 Ω-cm，空穴迁移率为 1.5 cm2/Vs。为了研究 Cu2-xSe NPs 作为吸收体的潜力，具有钠钙玻璃 (SLG)/Mo/Cu2-xSe NPs/CdS/i-ZnO/Al:ZnO/Ni/Ag 器件配置的太阳能电池经过制造和测试，其功率转换效率 (PCE) 为 0.095%。尽管 Cu2-xSeNPs 太阳能电池的 PCE 较低，但使用抗坏血酸等环境友好的还原剂提供了生态友好性和水溶性 Cu2-xSe NPs 合成的兼容性，并最终用于太阳能电池以及其他应用。