Bi2Te3/Bi2Se3/Bi2S3 级联异质结构用于具有小偏置电压的快速响应和高光响应光电探测器和高效水分解,Advanced Science

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Bi2Te3/Bi2Se3/Bi2S3 级联异质结构用于具有小偏置电压的快速响应和高光响应光电探测器和高效水分解
Advanced Science ( IF 14.3 ) Pub Date : 2022-12-27 , DOI: 10.1002/advs.202205460
Chunhui Lu ₁ , Mingwei Luo ₁ , Wen Dong ₁ , Yanqing Ge ₁ , Taotao Han ₁ , Yuqi Liu ₁ , Xinyi Xue ₁ , Nan Ma ₁ , Yuanyuan Huang ₁ , Yixuan Zhou ₁ , Xinlong Xu ₁

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大规模多异质结构和最佳带对齐具有极大的挑战性，但对于光电化学 (PEC) 型光电探测器和水分解至关重要。在此，通过连续气相沉积法成功合成了厘米级的基于铋硫族化物的级联异质结构。_{对Bi 2} Te ₃ /Bi ₂ Se ₃ /Bi ₂ S ₃的多交错带排列进行了优化，并通过X射线光电子能谱进行了验证。基于这些级联异质结构的 PEC 光电探测器表现出最高的光响应性（103 mA W ^-1在 -0.1 V 和 3.5 mAW ^-1在 0 V 在 475 nm 光激发下）在以前基于二维材料和相关异质结构的报告中。^此外，该光电探测器在475 纳米。由于快速的电荷传输和高效的光吸收，Bi ₂ Te ₃ /Bi ₂ Se ₃ /Bi ₂ S ₃级联异质结构展示了高效的氢气生产率（≈0.416 mmol cm ^-2 h ^-1和≈14.320 µmol cm ⁻² 小时⁻¹分别有或没有牺牲剂），远优于纯铋硫族化物及其II型异质结构。大规模级联异质结构为未来提高光电器件的性能提供了一种创新方法。

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Bi2Te3/Bi2Se3/Bi2S3 Cascade Heterostructure for Fast-Response and High-Photoresponsivity Photodetector and High-Efficiency Water Splitting with a Small Bias Voltage

Large-scale multi-heterostructure and optimal band alignment are significantly challenging but vital for photoelectrochemical (PEC)-type photodetector and water splitting. Herein, the centimeter-scale bismuth chalcogenides-based cascade heterostructure is successfully synthesized by a sequential vapor phase deposition method. The multi-staggered band alignment of Bi₂Te₃/Bi₂Se₃/Bi₂S₃ is optimized and verified by X-ray photoelectron spectroscopy. The PEC photodetectors based on these cascade heterostructures demonstrate the highest photoresponsivity (103 mA W⁻¹ at −0.1 V and 3.5 mAW⁻¹ at 0 V under 475 nm light excitation) among the previous reports based on two-dimensional materials and related heterostructures. Furthermore, the photodetectors display a fast response (≈8 ms), a high detectivity (8.96 × 10⁹ Jones), a high external quantum efficiency (26.17%), and a high incident photon-to-current efficiency (27.04%) at 475 nm. Due to the rapid charge transport and efficient light absorption, the Bi₂Te₃/Bi₂Se₃/Bi₂S₃ cascade heterostructure demonstrates a highly efficient hydrogen production rate (≈0.416 mmol cm⁻² h⁻¹ and ≈14.320 µmol cm⁻² h⁻¹ with or without sacrificial agent, respectively), which is far superior to those of pure bismuth chalcogenides and its type-II heterostructures. The large-scale cascade heterostructure offers an innovative method to improve the performance of optoelectronic devices in the future.

更新日期：2022-12-27

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