Abstract The present work demonstrates the structural and photophysical properties of mixed zinc tin oxide (Zn:SnO2) nanowires (NWs) synthesized via vapor transport technique with Zn content of 10, 25 and 50 wt%. The XRD spectra reveals the tetragonal phase of SnO2 for 10 wt% Zn content, whereas a combination of tetragonal SnO2 and hexagonal ZnO phases were observed for higher Zn ratios. The SEM images reveals the formation of smooth NWs for low Zn content, whereas a combination of NWs along with spherical nanoparticles have been observed for 50 wt% Zn:SnO2 sample. The optical band gap was decreased from 3.21 eV (10% Zn:SnO2) to 2.84 eV (50% Zn:SnO2), whereas the corresponding Urbach energy increased from 971 meV to 1132 meV. The refractive index values increased from 2.28 to 2.64 when Zn content increased from 10 to 50 wt%. The absorption spectra showed a red shift and the appearance of new band with increasing Zn wt.%, signaling the formation of new electronic states below the conduction band. The fabricated films displayed a broad steady state emission with peak around 462 nm, which intensity decreased with the increasing of Zn ratio. The effective life time of charge carrier was decreased from 198 ps for 10 wt% Zn:SnO2 to 172 ps for 50 wt% Zn:SnO2.

中文翻译：

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混合 Zn:SnO2 纳米线的合成、结构和光物理性能

摘要 本工作展示了通过气相传输技术合成的锌含量分别为 10、25 和 50 wt% 的混合氧化锌锡 (Zn:SnO2) 纳米线 (NWs) 的结构和光物理特性。XRD 谱揭示了 10 wt% Zn 含量时 SnO2 的四方相，而对于更高的 Zn 比率观察到四方 SnO2 和六方 ZnO 相的组合。SEM 图像揭示了低 Zn 含量下平滑 NW 的形成，而对于 50 wt% Zn:SnO2 样品，观察到 NW 与球形纳米粒子的组合。光学带隙从 3.21 eV（10% Zn:SnO2）降低到 2.84 eV（50% Zn:SnO2），而相应的 Urbach 能量从 971 meV 增加到 1132 meV。当Zn含量从10wt%增加到50wt%时，折射率值从2.28增加到2.64。吸收光谱随着 Zn 重量百分比的增加而出现红移和新带的出现，表明在导带下方形成了新的电子态。制备的薄膜显示出宽的稳态发射，峰值在 462 nm 附近，其强度随着 Zn 比的增加而降低。电荷载流子的有效寿命从 10 wt% Zn:SnO2 的 198 ps 降低到 50 wt% Zn:SnO2 的 172 ps。