Na-Bi共掺对Cu2ZnSnS4薄膜性能的影响

Cu₂ZnSnS₄(CZTS)薄膜因其元素储量高、较佳的光学带隙、优异的电学性能等优势而得到广泛关注。以硝酸铋为铋源、乙酸钠为钠源,采用溶胶-凝胶法制备Na-Bi掺杂的CZTS薄膜。研究Na-Bi共掺对CZTS薄膜的物相结构、微观形貌、光学性能以及光电性能的影响。结果表明,制备的薄膜为锌黄锡矿结构。Na和Bi元素的掺入对薄膜的微观形貌影响较大。固定Na的原子数分数为1%,随着Bi元素原子数分数的增加,薄膜的晶粒尺寸先增大后减小,均匀性逐渐提高,光敏性先增大后减小,光学带隙逐渐增大。当Na和Bi原子数分数分别为1%和0.5%时,薄膜的光学带隙为1.42 eV,光敏性最佳为1.17。

Effect of Na-Bi Co-Doping on the Properties of Cu2ZnSnS4 Thin Films

The Cu₂ZnSnS₄(CZTS)thin film has attracted wide attention due to its advantages such as abundant elements,better optical band gap and excellent electrical performance.With bismuth nitrate as the bismuth source and sodium acetate as the sodium source,Na-Bi doped CZTS thin films were prepared by sol-gel method.The effects of Na-Bi co-doping on the phase structure,morphology,optical property and photoelectric performance of the CZTS thin films were studied.The results show that the as-prepared thin film has a kesterite structure.The addition of Na and Bi elements has an obvious effect on the morphology of the thin film.When the atomic number fraction of Na is 1%,with the increase of Bi atomic number fraction,the grain size of the thin film firstly increases and then decreases,the uniformity is gradually enhanced,the photosensitivity first increases and then decreases,and the optical band gap gradually increases.When the atomic number fractions of Na and Bi are 1%and 0.5%respectively,the optical band gap and best photosensitivity of the thin film are 1.42 eV and 1.17,respectively.