Cu2ZnSnS4(CZTS)/单晶TiO2纳米线阵列复合薄膜的制备及其光电性能研究

鉴于单晶TiO2纳米线阵列在光电荷传输上的高效性和Cu2ZnSnS4(CZTS)作为太阳光吸收材料的低成本、无毒和高吸收性，本项目采用水热/溶剂热－两步法在钛箔表面制备CZTS/单晶TiO2纳米线阵列复合薄膜，并以此为基础组装CZTS敏化TiO2有序纳米阵列太阳能电池。通过对溶剂热反应过程、CZTS/TiO2异质结界面结构、异质结光电性能的研究，揭示溶剂热条件下纳米空隙内CZTS的原位生长行为，提出CZTS/TiO2异质结界面处的光电荷传输机制。本项研究开拓了CZTS新的应用领域，为提高无机物敏化TiO2太阳能电池光电转换效率提供了新的途径，为设计新型太阳能电池结构提供了理论基础和依据。

Based on high photoelectric charge transfer efficiency of single crystalline TiO2 nanowire arrays and low cost, non-toxic, high visible light absorption efficiency of Cu2ZnSnS4 (CZTS), CZTS sensitized TiO2 nano arrays solar cells are fabricated. Herein, CZTS/single crystalline TiO2 nanowire arrays are synthesized on the surface of the titanium foil by a two-step (hydrothermal/ solvothermal) method. Through the research on the process of solvothermal reaction, the heterojunction interface structure of CZTS/TiO2 and the photovoltaic properties of heterojunction, we reveal the in-situ growth behavior of CZTS in TiO2 nanowire arrays and present a photoelectric charge transfer mechanism of CZTS/TiO2 heterojunction. Otherwise, this study develops a new application field of CZTS, provides a new way to improve the photoelectric conversion efficiency of the inorganic materials sensitized solar cells, gives the theoretical basis and evidences for designing new solar cells' structures.