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Quasi-Two-Dimensional CsPbBr3 Quantum Dot Superlattice/WS2 Hybrid Photodetector: Self-Assembly Fabrication and Performance Optimization
ACS Photonics ( IF 6.5 ) Pub Date : 2025-01-24 , DOI: 10.1021/acsphotonics.4c02218
Huanteng Luo, Yiming Zhao, Zhenjun Chen, Yao Zhou, Jiabin Li, Zheng Liu, Jie Zhao, Tao Zheng, Wei Gao, Xiao Liu
ACS Photonics ( IF 6.5 ) Pub Date : 2025-01-24 , DOI: 10.1021/acsphotonics.4c02218
Huanteng Luo, Yiming Zhao, Zhenjun Chen, Yao Zhou, Jiabin Li, Zheng Liu, Jie Zhao, Tao Zheng, Wei Gao, Xiao Liu
The field of optoelectronics has witnessed a surge of interest in hybrid structures that combine colloidal quantum dots (QDs) and two-dimensional (2D) materials. These structures are expected to offer a synergistic blend of high responsivity and rapid response times. However, the potential of QD-based photodetectors has been consistently undermined by the limited carrier mobility in QD films, which arises from the inherent disordered QD and ligand packing produced through conventional fabrication methods. It introduces a pioneering approach to address this limitation: the successful growth and lossless transfer of a micrometer-scale mesocrystalline, oriented packed CsPbBr3 QD superlattice (SL) onto 2D WS2. The effective coupling within these SLs endows them with quasi-2D material characteristics and, when integrated with the intrinsic 2D properties of WS2, results in a photodetector with exceptional performance. Under 405 nm illumination, it demonstrates a remarkable responsivity of 91.24 A/W, a specific detectivity of 1.15 × 1011 Jones, and swift response times of 160 μs/380 μs. These performance metrics exceed those of disordered CsPbBr3 QDs/WS2 photodetector prepared by spin-coating, underscoring the superior optoelectronic properties of the SL/WS2 hybrid structure. This breakthrough not only contributes to the design of high-performance photodetectors but also facilitates transformative progress in the field of optoelectronic technologies.
中文翻译:
准二维 CsPbBr3 量子点超晶格/WS2 杂化光电探测器:自组装制备与性能优化
光电子学领域见证了人们对结合胶体量子点 (QD) 和二维 (2D) 材料的混合结构的兴趣激增。这些结构有望提供高响应性和快速响应时间的协同组合。然而,基于 QD 的光电探测器的潜力一直受到 QD 薄膜中有限的载流子迁移率的破坏,这是由传统制造方法产生的固有无序 QD 和配体堆积引起的。它引入了一种解决这一限制的开创性方法:将微米级介晶、取向堆积的 CsPbBr3 QD 超晶 (SL) 成功生长和无损转移到 2D WS2 上。这些 SL 中的有效耦合赋予了它们准 2D 材料特性,当与 WS2 固有的 2D 特性集成时,可以产生具有卓越性能的光电探测器。在 405 nm 照明下,它表现出 91.24 A/W 的显著响应度、1.15 × 1011 Jones 的特异性检测率以及 160 μs/380 μs 的快速响应时间。这些性能指标超过了通过旋涂制备的无序 CsPbBr3 QDs/WS2 光电探测器的性能指标,强调了 SL/WS2 杂化结构的卓越光电特性。这一突破不仅有助于高性能光电探测器的设计,还促进了光电技术领域的变革性进步。
更新日期:2025-01-25
中文翻译:
准二维 CsPbBr3 量子点超晶格/WS2 杂化光电探测器:自组装制备与性能优化
光电子学领域见证了人们对结合胶体量子点 (QD) 和二维 (2D) 材料的混合结构的兴趣激增。这些结构有望提供高响应性和快速响应时间的协同组合。然而,基于 QD 的光电探测器的潜力一直受到 QD 薄膜中有限的载流子迁移率的破坏,这是由传统制造方法产生的固有无序 QD 和配体堆积引起的。它引入了一种解决这一限制的开创性方法:将微米级介晶、取向堆积的 CsPbBr3 QD 超晶 (SL) 成功生长和无损转移到 2D WS2 上。这些 SL 中的有效耦合赋予了它们准 2D 材料特性,当与 WS2 固有的 2D 特性集成时,可以产生具有卓越性能的光电探测器。在 405 nm 照明下,它表现出 91.24 A/W 的显著响应度、1.15 × 1011 Jones 的特异性检测率以及 160 μs/380 μs 的快速响应时间。这些性能指标超过了通过旋涂制备的无序 CsPbBr3 QDs/WS2 光电探测器的性能指标,强调了 SL/WS2 杂化结构的卓越光电特性。这一突破不仅有助于高性能光电探测器的设计,还促进了光电技术领域的变革性进步。