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Journal of Semiconductors 2023年第9期44卷 1-2页

作者： hoi-sing kwok Zhiyong Fan Department of Electronic and Computer Engineering The Hong Kong University of Science and TechnologyClear Water BayKowloonHong Kong SARChina State Key Laboratory of Advanced Displays and Optoelectronics Technologies HKUSTClear Water BayKowloonHong Kong SARChina

This year marks the tenth anniversary of the State Key Laboratory of Advanced Displays and Optoelectronics Technologies(SKLADOT)at the Hong Kong University of Science and Technology(HKUST).The predecessor of SKLADOT w... 详细信息

关键词： ADO Key UST

H-plasma-assisted aluminum induced crystallization of amorphous silicon

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Journal of Semiconductors 2012年第6期33卷 125-128页

作者：李娟刘宁罗翀孟志国熊绍珍 hoi sing kwok Institute of Photo-Electronics Nankai UniversityTianjin Key Laboratory for Photo-Electronic Thin Film Devices and Technology Department of Electronic and Computer Engineering The Hong Kong University of Science and Technology

A technique to improve and accelerate aluminum induced crystallization（AIC） by using hydrogen plasma is *** spectroscopy and secondary ion mass spectrometry of crystallized poly-Si thin films show that hydrogen plasma radicals reduce the crystallization time of *** technique shortens the annealing time from 10 to 4 h and increases the Hall mobility from 22.1 to 42.5 cm^2/（V·s）.The possible mechanism of AIC assisted by hydrogen radicals is also discussed.

关键词： poly-silicon H-plasma aluminum induced crystallization

Kerr effect and Kerr constant enhancement in vertically aligned deformed helix ferroelectric liquid crystals

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Chinese Physics B 2016年第9期25卷 9-12页

作者： Liangyu Shi Abhishek Kumar Srivastava Vladimir G Chigrinov hoi-sing kwok State Key Laboratory on Advanced Displays and Optoelectronics Technologies Hong Kong University of Science and Technology

In this article,we review recently achieved Kerr effect progress in novel liquid crystal（LC） material：vertically aligned deformed helix ferroelectric liquid crystal（VADHFLC）.With an increasing applied electric field,the induced inplane birefringence of LCs shows quadratic *** theoretical calculations and experimental details are *** an enhanced Kerr constant to 130 nm/V2,this VADHFLC cell can achieve a 2π modulation by a small efficient electric field with a fast response around 100 μs and thus can be employed in both display and photonics devices.

关键词： Kerr effect deformed helix ferroelectric liquid crystal phase modulation of light

Advances in mobility enhancement of ITZO thin-film transistors:a review

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Journal of Semiconductors 2023年第9期44卷 11-25页

作者： Feilian Chen Meng Zhang Yunhao Wan Xindi Xu Man Wong hoi-sing kwok College of Electronic and Information Engineering Shenzhen UniversityShenzhen 518060China Institute of Microscale Optoelectronics(IMO) Shenzhen UniversityShenzhen 518060China State Key Laboratory of Advanced Displays and Optoelectronics Technologies The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina

Indium-tin-zinc oxide(ITZO)thin-film transistor(TFT)technology holds promise for achieving high mobility and offers significant opportunities for *** paper provides a review of progress made in improving the mobility of ITZO *** paper begins by describing the development and current status of metal-oxide TFTs,and then goes on to explain the advantages of selecting ITZO as the TFT channel *** evaluation criteria for TFTs are subsequently introduced,and the reasons and significance of enhancing mobility are *** paper then explores the development of high-mobility ITZO TFTs from five perspectives:active layer optimization,gate dielectric optimization,electrode optimization,interface optimization,and device structure ***,a summary and outlook of the research field are presented.

关键词： thin-film transistor(TFT) indium-tin-zinc oxide(ITZO)TFT mobility active matrix(AM)displays

Crystallization of amorphous silicon beyond the crystallized polycrystalline silicon region induced by metal nickel

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Chinese Physics B 2017年第1期26卷 353-356页

作者： Dongli Zhang Mingxiang Wang Man Wong hoi-sing kwok Department of Microelectronics Soochow University Suzhou 215006 China Center for Display Research Department of Electronic and Computer Engineering the Hong Kong University of Science and Technology Kowloon Hong Kong China

Crystallization of amorphous silicon（a-Si） which starts from the middle of the a-Si region separating two adjacent metal-induced crystallization（MIC） polycrystalline silicon（poly-Si） regions is observed. The crystallization is found to be related to the distance between the neighboring nickel-introducing MIC windows. Trace nickel that diffuses from the MIC window into the a-Si matrix during the MIC heat-treatment is experimentally discovered, which is responsible for the crystallization of the a-Si beyond the MIC front. A minimum diffusion coefficient of 1.84×10^-9cm^2/s at 550℃ is estimated for the trace nickel diffusion in a-Si.

关键词： metal-induced crystallization poly-Si nickel diffusion coefficient

A fully self-powered, natural-light-enabled fiber-optic vibration sensing solution

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SusMat 2021年第4期1卷 593-602页

作者： Jiaqi Wang Ho-Yin Man Cuiling Meng Pengcheng Liu Shaoxin Li hoi-sing kwok Yunlong Zi School of Marine Sciences Sun Yat-Sen UniversityZhuhaiGuangdongP.R.China Department of Mechanical and Automation Engineering The Chinese University of Hong KongShatinN.T.Hong KongP.R.China State Key Laboratory on Advanced Displays and Optoelectronics Technologies The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongP.R.China Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijingP.R.China

Fiber-optic sensors have been developed to monitor the structural vibration with advantages of high sensitivity,immunity to electromagnetic interference(EMI),flexibility,and capability to achieve multiplexed or distributed ***,the current fiber-optic sensors require precisely polarized coherent lasers as the lighting sources,which are expensive in cost and suffer from the power supply issues while operating at outdoor *** work aims at solving these issues,through developing a fully self-powered,natural-light-enabled *** achieve that,a spring oscillator-based triboelectric nanogenerator(TENG),a polymer network liquid crystal(PNLC),and an optical fiber were *** external vibration drove the PNLC to switch its transparency,allowing the varia-tion of the incident natural light in the optical *** with the majority of conventional TENG-based active vibration sensors,the developed paradigm does not suffer from the EMI,without requirements of the signal preamplifica-tion which consumes additional *** vibration displacement monitoring was performed to validate the sensing effectiveness of the developed paradigm.

关键词： fiber-optics liquid crystal self-powered sensing triboelectric nanogenerators vibration sensing

Crystallization of μc-Si on plastic substrate by using a pulsed double-frequency YAG laser

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Optoelectronics Letters 2008年第3期4卷 213-216页

作者： LI Juan MENG Zhi-guo LI Yang WU Chun-ya hoi sing kwok Xiong Shao-Zhen Institute of Photoelectronics Nankai University Tianjin 300071 China The Tianjin Key Laboratory of Photoelectronic Thin Film Devices and Technology Nankai University Tianjin 300071China Ministry of Education Key Laboratory for Optoelectronic Information Science and Technology Nankai UniversityTianjin 300071 China Department of Electronic and Computer engineering The Hong Kong University of Science and Technology HongKong China

Thin film transistors （TFTs） of microcrystalline silicon （μc-Si） can provide higher mobility and stability than that of a-Si and better uniformity than that of poly-Si TFTs, and it would be more suitable to be applied to larger-area AMOLEDs. By using 2coYAG laser ann. ealing, crystalline μc-Si thin film on plastic substrate has been investigated and the proper laser energy needed for crystallization has been indicated. It has been found that the dehydrogenation process at 300-450℃ for a few of hours could be omitted by decreasing the H content in the crystallization precursor, which is suitable for laser crystallization on plastic substrates. The crystalline volume fraction （Xc） and the grain size of the resulted μc-Si could be adjusted by controlling the laser energy. By this method, the μc-Si on plastic substrate with Xc and grain size is respectively 85% （at the maximum） and 50 nm.

关键词：晶体塑料脉冲技术激光器

Ionic liquid multistate resistive switching characteristics in two terminal soft and flexible discrete channels for neuromorphic computing

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Microsystems & Nanoengineering 2022年第3期8卷 153-161页

作者： Muhammad Umair Khan Jungmin Kim Mahesh Y.Chougale Chaudhry Muhammad Furqan Qazi Muhammad Saqib Rayyan Ali Shaukat Nobuhiko P.Kobayashi Baker Mohammad Jinho Bae hoi-sing kwok Department of Ocean System Engineering Jeju National University102 JejudaehakroJeju 63243Republic of Korea Department of Electrical Engineering and Computer Science Khalifa UniversityAbu Dhabi 127788UAE System on Chip Center Khalifa UniversityAbu Dhabi 127788UAE Department of Electronics and Computer Engineering The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina State Key Laboratory on Advanced Displays and Optoelectronics Technologies The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina Baskin School of Engineering Univerity of California Santa Cruz1156 High StreetSanta CruzCA 95064USA

By exploiting ion transport phenomena in a soft and flexible discrete channel,liquid material conductance can be controlled by using an electrical input signal,which results in analog neuromorphic *** paper proposes an ionic liquid(IL)multistate resistive switching device capable of mimicking synapse analog behavior by using IL BMIM FeCL_(4) and H_(2)O into the two ends of a discrete polydimethylsiloxane(PDMs)*** spike rate-dependent plasticity(SRDP)and spike-timing-dependent plasticity(STDP)behavior are highly stable by modulating the input ***,the discrete channel device presents highly durable performance under mechanical bending and *** the obtained parameters from the proposed ionic liquid-based synaptic device,convolutional neural network simulation runs to an image recognition task,reaching an accuracy of 84%.The bending test of a device opens a new gateway for the future of soft and flexible brain-inspired neuromorphic computing systems for various shaped artificial intelligence applications.

关键词： computing gateway state

Blue fluorophores comprised of tetraphenylethene and imidazole： aggregation-induced emission and electroluminescence

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Frontiers of Optoelectronics 2015年第3期8卷 274-281页

作者： Jiayun XIANG Han NIE Yibin JIANG Jian ZHOU hoi sing kwok Zujin ZHAO Ben Zhong TANG College of Material Chemistry and Chemical Engineering Hangzhou Normal University Hangzhou 310036 China Guangdong Innovative Research Team State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou 510640 China Center for Display Research The Hong Kong University of Science & Technology Kowloon Hong Kong China Department of Chemistry Division of Biomedical Engineering Division of Life Science The Hong Kong University of Science & Technology Kowloon Hong Kong China

By melting tetraphenylethene （TPE） and 1,2,4,5-tetraphenyl-lH-imidazole （TPI） units together through different linking positions, three new fluorophores are synthesized, and their optical, electronic and electro- luminescence （EL） properties are fully studied. Owing to the presence of TPE unit（s）, these fluorophores are weak emitters in solutions, but are induced to emit strongly in the aggregated state, presenting typical aggregation-induced emission characteristics. The experimental and computational results reveal that different connection patterns between TPE and TPI could impact the molecular conjugation greatly, leading to varied emission wavelength, fluorescence quantum yield and EL performance in organic light emitting diodes （OLEDs）. The fluorophore built by attaching TPE unit to the 1-position of imidazole ring shows bluest fluorescence, and its EL device emits at deep blue region （445 nm; CIE= （0.16, 0.15））. And the device based on the fluorophore by linking TPE to the 2- position of imidazole ring shows EL at 467 nm （CIE= （0.17, 0.22）） with good efficiencies of 3.17 cd.A ^-1, and 1.77%.

关键词： aggregation-induced emission (AIE) tetraphenylethene (TPE) imidazole blue fluorescence organic light emitting diode (OLED)

Novel Transflective LCD Based on Patterned Polarizer Using Photoalignment Technique

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Novel Transflective LCD Based on Patterned Polarizer Using P...