Guohui Li
Taiyuan University of Technology
54 Papers
34 Citations
Guohui Li is an academic researcher from Taiyuan University of Technology. The author has contributed to research in topics: Perovskite (structure) & Photodetector. The author has an hindex of 8, co-authored 34 publications.
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Papers
Stability of Perovskite Light Sources: Status and Challenges
Guohui Li,Keqiang Chen,Yanxia Cui,Yupeng Zhang,Yue Tian,Bining Tian,Yuying Hao,Yucheng Wu,Han Zhang +8 more
Abstract: Stable perovskites light sources with long‐term stability are of great significance for future commercial applications. In this review, recent advances of the degradation models for perovskites and strategies for enhancing the stability of the corresponding light sources are summarized. Improving the stability and quality of perovskite materials is a common way for developing stable perovskite light sources. For strengthening the stability of perovskite light‐emitting diodes, approaches such as surface and interface engineering and employing more stable hole injection layers are effective. To enhance the stability of perovskite amplified spontaneous emission and lasers, methods such as protecting perovskites by materials with high intrinsic thermal conductivity and high stability, better thermal managements, and reducing the threshold carrier densities are useful. This work will be helpful for further prompting the performances, especially the stability of perovskite light sources in this fantastic field.
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Research Progress in Organic Photomultiplication Photodetectors.
TL;DR: The research progress in each type of organic photomultiplication photodetectors based on the trap assisted carrier tunneling effect is reviewed in detail and the prospects of future research into these devices are discussed.
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Record-Low-Threshold Lasers Based on Atomically Smooth Triangular Nanoplatelet Perovskite
Abstract: Single‐crystalline perovskites are ideal candidates for lasing and other optoelectronic applications. Although significant efforts have been made to grow both bulk single‐crystalline perovskites in liquid solution, their dimensions are still too large to make nanoscale whispering‐gallery‐mode (WGM) resonator based lasers that possess high quality (Q) factor and small volume. Besides, most reported perovskite resonators do not possess atomically smooth surfaces and facets, which limits the Q and thereby increases the lasing threshold. Here, atomically smooth triangular PbI2 templates are fabricated on a mica substrate by the vapor phase deposition method and are converted to atomically smooth perovskites which have regular and unwrinkled facets with average surface roughness less than 2 nm. By using a CH3NH3PbI3 nanoplatelet with a side length of 27 µm and thickness of 80 nm, room temperature WGM lasing with a Q up to 2600 is demonstrated, the highest reported for hybrid organic–inorganic perovskite nanoplatelets. In addition, the volume of the WGM mode is reduced significantly in comparison with the prior reports. The realized high‐quality triangular CH3NH3PbI3 perovskite nanoplatelets with high Q factor and small volume are expected to perform as ideal cavities for long pulse durations lasers and would find potential applications in integrated optoelectronic devices.
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Recent advances in black phosphorus/carbon hybrid composites: from improved stability to applications
Yue Tian,Huide Wang,Haonan Li,Zhinan Guo,Bining Tian,Yanxia Cui,Zhanfeng Li,Guohui Li,Han Zhang,Yucheng Wu +9 more
TL;DR: In this paper, the enhanced stability of black phosphorus (BP)-based composites is presented based on the fundamental chemistry of BP degradation, which originates from the formation of P-C/P-O-C bonds or van der Waals interactions in BP/carbon hybrid composites.
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Single-crystalline lead halide perovskite wafers for high performance photodetectors
Gao Juan,Liang Qiangbing,Guohui Li,Ting Ji,Yucheng Liu,Ming-Ming Fan,Yuying Hao,Shengzhong Liu,Yucheng Wu,Yanxia Cui +9 more
TL;DR: In this paper, a large SC perovskite wafer with a light on/off current ratio of 4.3 × 103, a response time of 770 μs, and a linear dynamic range of 119 dB.
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