Investigation of Cu2ZnSnS4 thin films with controllable Cu composition and its influence on photovoltaic properties for solar cells
Investigation of Cu2ZnSnS4 thin films with controllable Cu composition and its influence on photovoltaic properties for solar cells
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DOI：
10.1016/j.jallcom.2016.10.024
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发表时间：
2017-02
影响因子：
6.2
通讯作者：
Xin-Ru Li;H. Cao;Yuchen Dong;F. Yue;Ye Chen;P. Xiang;Lin Sun;P. Yang;J. Chu
中科院分区：
文献类型：
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作者：
Xin-Ru Li;H. Cao;Yuchen Dong;F. Yue;Ye Chen;P. Xiang;Lin Sun;P. Yang;J. Chu
研究了Cu组分对射频磁控溅射法和后硫化法制备的Cu 2 ZnSnS 4（CZTS）薄膜的结构、形貌、光学性能以及CZTS太阳电池性能的影响。通过XRD、拉曼光谱和远红外光谱对CZTS薄膜的晶体结构进行了表征，结果表明，通过控制CZTS薄膜中Cu的含量，可以有效地抑制第二相（如SnS和Cu 2SnS 3）的生成。此外，形态学研究表明，CZTS薄膜与低Cu含量表现出双层结构，而与高Cu含量表现出整个吸收膜的晶粒生长与一些空隙在Mo/CZTS界面。最后，制备了铜含量为3.46%的贫铜CZTS太阳能电池。温度和激发功率相关的光致发光测量揭示了贫铜CZTS器件中导带尾电子与束缚在相邻受主能级上的空穴之间的辐射复合。提取了贫铜CZTS太阳电池的二极管参数，并讨论了限制效率的可能原因。
The effects of Cu composition on the structural, morphological, optical properties of Cu2ZnSnS4(CZTS) films prepared by RF magnetron sputtering and a post sulfurization, and CZTS solar cells performance have been investigated. The crystal structure characterized by XRD patterns, Raman and far-infrared spectra reveal that the secondary phases (e.g. SnS and Cu2SnS3) can be suppressed effectively by manipulating the Cu content in CZTS thin films. Furthermore, morphological studies indicate that the CZTS thin film with low Cu content shows a bilayer structure, while that with high Cu content exhibits the grain growth throughout the entire absorber film with some voids at the Mo/CZTS interface. Finally, a Cu-poor CZTS solar cell with 3.46% is fabricated. Temperature and excitation-power dependent Photoluminescence measurement reveals the radiative recombination between electrons in conduction band tails and holes bound to the neighboring acceptors levels in Cu-poor CZTS device. The diode parameters of Cu-poor CZTS solar cell are extracted and used to discuss the possible reason for limiting efficiency.