Yuwei Zhang

Van der Waals/MCT heterostructure enabled high-performance uncooled mid-infrared photodetectors via synergistic suppression of dark current and interfacial recombination

Xinlei Zhang, Tao Zhou, Yueying Cui, Ruizhi Li et autres

Abstract Mid-wavelength infrared (MWIR) photodetection is crucial for applications such as night vision, remote sensing, spectral imaging and optical communication, yet its room-temperature operation faces a fundamental challenge of excessive dark current. While high-operating-temperature (HOT) HgCdTe (MCT) devices mitigate this issue through …

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Precisely controlled type-II band alignment for efficient carrier transfer in Ruddlesden–Popper perovskite heterojunctions

Yong Zhang, Zhihao Qu, Yuwei Zhang, Qihua Liu et autres

The performance of two-dimensional Ruddlesden–Popper perovskites (RPPs) is often limited by disordered phase distributions in solution-processed films, which create unpredictable carrier transfer pathways and obscure structure–property relationships. While phase engineering can globally modulate film properties, the nanoscale carrier dynamics governing device performance …

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Dual-mode switchable and reconfigurable Van der Waals phototransistor for multi-state image encryption

Yuanfang Yu, Senyao Tang, Nanjie Jiang, Yuwei Zhang et autres

Abstract Switchable phototransistors equipped with high-sensitivity, dynamic encryption, low-power consumption, and CMOS processing compatibility are key components for optoelectronic encryption chips. Two-dimensional van der Waals (vdWs) heterostructures provide a solution toward this goal, despite continued efforts, excessive dependence on gate voltage modulation, …

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Origin of B‐Type Blinking at 2D/3D Heterojunction Interfaces

Tao Zhou, Dongyang Wan, Yuwei Zhang, Lei Gao et autres

Abstract Photoluminescence blinking is a common phenomenon that occurs across various low‐dimensional materials, like 0D quantum dots or 1D nanowires. Two blinking types in 0D and 1D systems have been observed and extensively studied, revealing the mechanisms of non‐equilibrium photocarrier kinetics, thereby …

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Near-100% spontaneous rolling up of polar van der Waals materials

Zhi Zhang, Yuwei Zhang, Kangjun Lu, Jun‐Jie Zhang et autres

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Van der Waals/MCT Heterostructure Enabled High-Performance Uncooled Mid-Infrared Photodetectors via Synergistic Suppression of Dark Current and Interfacial Recombination

Zhenhua Ni, Xinlei Zhang, Yueying Cui, Ruizhi Li et autres

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Carrier recombination dynamics in external-quantum-efficiency roll-off of perovskite light-emitting diodes studied by in situ ultrafast spectroscopy

Yong Zhang, Jiajun Qin, Lei Gao, Tao Zhou et autres

External-quantum-efficiency (EQE) roll-off is a key challenge for perovskite light-emitting diodes (PeLEDs), limiting their applications where high brightness is needed. Auger recombination and Joule heating are considered the main issues behind the EQE roll-off in PeLEDs. Despite intensive efforts to address these …

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Van der Waals integrated single-junction light-emitting diodes exceeding 10% quantum efficiency at room temperature

Zhenliang Hu, Qiang Fu, Junpeng Lü, Yong Zhang et autres

The construction of miniaturized light-emitting diodes (LEDs) with high external quantum efficiency (EQE) at room temperature remains a challenge for on-chip optoelectronics. Here, we demonstrate microsized LEDs fabricated by a dry-transfer van der Waals (vdW) integration method using typical layered Ruddlesden-Popper perovskites …

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Highly sensitive MoS2 photodetector on polarized thin-film lithium niobate with extremely low dark current

Haiwei Chen, Yuwei Zhang, Jun Zhou, Bei Zhao et autres

To obtain high performance optoelectronic devices, ferroelectric materials have received a lot of attention due to the various emerging effects on channel materials induced by the ferroelectric polarization. In this work, a special photodetector with the channel material of a triple-layer MoS2 …

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Interfacial Effect on the Transient Dielectric Function and Charge Transfer in a Monolayer WS 2 /Si Heterojunction

Yuwei Zhang, Tao Zhou, Fan Zhong, Guangsheng Jiang et autres

Monolayer tungsten disulfide (WS 2 ) is a highly promising material for silicon photonics. Thus, the WS 2 /Si interface plays a very important role due to the interfacial complex effects and abundant states. Among them, the effect of charge transfer on …

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Polymer Solar Cells with 90% External Quantum Efficiency Featuring an Ideal Light- and Charge-Manipulation Layer

Jingwen Chen, J. Zhu, R.-P. Xu, X. Zhan et autres

Rapid progress in the power conversion efficiency (PCE) of polymer solar cells (PSEs) is beneficial from the factors that match the irradiated solar spectrum, maximize incident light absorption, and reduce photogenerated charge recombination. To optimize the device efficiency, a nanopatterned ZnO:Al2O3 composite …

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