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首页> 外文期刊>RSC Advances >Electrospun Cu2ZnSnS4 microfibers with strong (112) preferred orientation: fabrication and characterization
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Electrospun Cu2ZnSnS4 microfibers with strong (112) preferred orientation: fabrication and characterization

机译：具有强（112）首选方向的电纺Cu2ZnSnS4超细纤维：制备和表征

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In this study, Cu2ZnSnS4 (CZTS) microfibers were fabricated using a non-vacuum method of electrospinning following vulcanization process. CZTS fibers were obtained via the vulcanization of the electrospun precursor fibers at 500 degrees C (CZTS-500), 550 degrees C (CZTS-550), and 600 degrees C (CZTS-600), in sulfur ambient conditions. Samples were characterized by scanning electron microscopy (SEM) equipped with energy-dispersive spectroscopy (EDS), X-ray diffraction (XRD), XRD mapping scan, Raman spectrum and UV-vis absorption. Polycrystalline CZTS fibers with kesterite crystallization were formed in CZTS-500, whereas higher temperature vulcanization in CZTS-550 led to a strong preferential crystallization along CZTS [112] crystal direction around fiber surface, which is definitely confirmed by XRD mapping scan. More interestingly, the band gap value (E-g), which was 1.48 eV for CZTS-500, reduced to 1.43 eV for CZTS-550. E-g reduction may be related to lattice distortion induced by stress or strain around fiber surface, and can be beneficial for broadening optical absorption range thus increasing the efficiency of CZTS-based solar cells.
机译：在这项研究中，Cu2ZnSnS4（CZTS）超细纤维是在硫化过程后使用电纺的非真空方法制造的。通过在硫环境条件下将电纺前体纤维在500摄氏度（CZTS-500），550摄氏度（CZTS-550）和600摄氏度（CZTS-600）的条件下硫化获得CZTS纤维。样品通过配备能谱仪（EDS）的扫描电子显微镜（SEM），X射线衍射（XRD），XRD图谱扫描，拉曼光谱和UV-vis吸收进行表征。在CZTS-500中形成了具有Kesterite结晶的多晶CZTS纤维，而CZTS-550中的较高温度硫化导致沿纤维表面周围的CZTS [112]晶体方向发生强烈的优先结晶，这可以通过XRD映射扫描得到证实。更有趣的是，CZTS-500的带隙值（E-g）为1.48 eV，CZTS-550的带隙值降至1.43 eV。 E-g的降低可能与纤维表面周围的应力或应变引起的晶格畸变有关，并且对于拓宽光吸收范围从而提高基于CZTS的太阳能电池的效率可能是有益的。

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