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Effect on passivation mechanism and properties of HfO2/crystalline-Si interface under different annealing atmosphere

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Solar Energy Materials and Solar Cells 2023年第1期257卷

作者： Zhang, Xiao-Ying Han, Jing Wang, Yao-Tian Ruan, Yu-Jiao Wu, Wan-Yu Wuu, Dong-Sing Zuo, Juan Lai, Feng-Min Lien, Shui-Yang Zhu, Wen-Zhang Xiamen Key Laboratory of Development and Application for Advanced Semiconductor Coating Technology School of Opto-Electronic and Communication Engineering Xiamen University of Technology Xiamen361024 China National Measurement and Testing Center for Flat Panel Display Industry Xiamen Institute of Measurement and Testing Xiamen361024 China Department of Materials Science and Engineering National United University Miaoli36063 Taiwan Department of Applied Materials and Optoelectronic Engineering National Chi Nan University Nantou54561 Taiwan School of Materials Science and Engineering Xiamen University of Technology Xiamen361024 China Department of Biomedical Engineering Da-Yeh University Changhua51591 Taiwan

Hafnium oxide (HfO2) thin film has received tremendous research interests as a passivation layer of crystalline silicon (c-Si) due to its thermal stability and positive fixed charges. HfO2 films were prepared both on P-type and N-type polished c-Si via a remote plasma atomic layer deposition process. Post annealing was carried out in oxygen, atmosphere (Air) and nitrogen (N2) at temperature of 500 °C. Electrical characterization was done through a regular metal-insulator-semiconductor structure and capacitance-voltage measurements. The oxide fixed charge (Qf) and density of interface traps (Dit) between HfO2 and c-Si were extracted. Qf and Dit reveal the potential of HfO2 for field effect and chemical passivation, respectively. Effective lifetime measurements by microwave photoconductivity decay in Si wafers passivated with HfO2 were applied to characterize surface recombination velocity to directly evaluate the overall passivation quality. The impacts of post-annealing gas ambient on passivation qualities on Si by HfO2 thin films are systematically studied. The results show that N2-annealed sample possesses the highest Qf of 1.73 × 1012 cm−2 and therefore provides the best field effect passivation. Air-annealed sample has lowest Dit of 1.0 × 1012 eV−1cm−2 and therefore provides the best chemical passivation. Air-annealed sample possesses the highest effective lifetime of 290 μs at injection level of 1 × 1015 cm−3, which means that good passivation was obtained for N-type Si wafer passivated with HfO2 after annealing in Air. © 2023 Elsevier B.V.

关键词： Annealing

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Electro-optical performance of OLED with MEH-PPV fabricated by solution process 26

Electro-optical performance of OLED with MEH-PPV fabricated ...

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26th International display Workshops, IDW 2019

作者： Lee, Seok Je Yao, Fangnan Lee, Seung Il Jin, Cao Kim, Woo Young Moon, C.-B. Jhun, Chul Gyu Department of Electronic Display Engineering Hoseo University Asan31499 Korea Republic of Key Laboratory of Advanced Display and System Applications Shanghai University Ministry of Education Shanghai200072 China

ISBN: (纸本)9781713806301

We investigated the effects of solvents and concentration on the electro-optical performance of the organic light emitting diode (OLED) fabricated by the solution process. From the experimental results, we optimized the fabrication method of it and we figure out the underlying mechanism of carrier flow by the trap state. © 2019 ITE and SID.

关键词： Fabrication

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Non-doped blue and red phosphorescent OLEDs based on benzothiazole as bipolar host materials

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Dyes and Pigments 2025年 242卷

作者： Yongjie Hou Siying Ye Daqing Zhang Yi Xu Wei Shi Haitao Zhou Jinhai Huang Bin Wei Zhiyun Zhang Key Laboratory for Advanced Materials and Institute of Fine Chemicals East China University of Science & Technology 130 Meilong Road Shanghai 200237 China Jiaxing Institute of Verification and Testing 66 Zhujiagang Road Jiaxing Zhejiang 314001 China Shanghai Taoe Chemical Technology Co. Ltd Shanghai China Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University 149 Yanchang Road Shanghai 200072 China

In this work, two novel bipolar host materials consisting of electron-rich carbazole and triphenylamine units and electron-deficient benzothiazole units, namely 4-(7-(4-(benzo[d]thiazol-2-yl)phenyl)-9,9-dimethyl-9H-fluoren-2-yl)-N,N-diphenylaniline ( TPA-BTZ ) and 2-(4-(7-(4-(9H-carbazol-9-yl)phenyl)-9,9-dimethyl-9H-fluoren-2-yl)phenyl)benzo-[d]thiazole ( Cz-BTZ ), were first designed and synthesized. By incorporating 9,9-dimethylfluorene π-bridge to increase the molecular rigidity and improve the photo-thermal stability and photo-luminescent quantum yields, all the materials exhibited excellent thermal stability with thermal decomposition temperature (5 % weight-loss temperature) of exceeding 380 °C. Red phosphorescent organic light-emitting diodes (PhOLEDs) based on these two materials were fabricated, which showed excellent performance with a very low turn-on voltage of 2.6 V. Remarkably, the device hosted by Cz-BTZ exhibited a maximal external quantum efficiencies (EQE max ) of 27.82 % and a maximal power efficiency of 36.21 lm/W. The device hosted by TPA-BTZ exhibited an EQE max of 27.72 % and a maximum luminance of 21116 cd/m 2 . Moreover, the Cz-BTZ -based OLED had a minor efficiency roll-off with the EQE remaining at 26.76 % when the luminance reached 1000 cd/m 2 . In addition, the non-doped blue OLED based on Cz-BTZ achieved an EQE max of 4.85 %. Designing bipolar phosphorescent host materials based on benzothiazole is a feasible approach for achieving highly efficient and thermally stable PhOLEDs.

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Synthesis and properties of novel N,C,N terdentate skeleton based on 1,3-di(pyridin-2-yl)benzene moiety-new tricks for old dogs

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Chinese Chemical Letters 2019年第11期30卷 1951-1954页

作者： Shuai Tan Xiugang Wu Yanqiong Zheng Yafei Wang a Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and Applications Jiangsu Key Laboratory of Environmentally Friendly Polymeric MaterialsJiangsu Collaboration Innovation Center of Photovoltaic Science and EngineeringSchool of Materials Science&EngineeringChangzhou UniversityChangzhou 213164China b College of Chemistry Key Lab of Environment-Friendly Chemistry and Application of the Ministry of EducationXiangtan UniversityXiangtan 411105China c Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai UniversityShanghai 200072China

Utilization of intermolecular Friedel-Crafts and intramolecular condensation reaction,novel 1,3-di-(pyridine-2-yl)benzene(N,C,N terdentate)skeleton with electro-withdrawing group in 6'position of pyridyl and a cyclization between 6'position of pyridyl and 6 position of benzyl ring were firstly designed and *** structures of these novel N,C,N terdentate were confirmed by NMR,MS and X-ray single *** photophysical properties of these compounds were briefly explored.

关键词： 1,3-Di(pyridin-2-yl)benzene skeleton Platinum complex Synthesis Intramolecular cyclization

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A New Low-power Pixel Circuit for OLEDoS Microdisplay

A New Low-power Pixel Circuit for OLEDoS Microdisplay

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17th China International Forum on Solid State Lighting &2020 International Forum on Wide Bandgap Semiconductors (第十七届中国国际半导体照明论坛暨2020国际第三代半导体论坛)

作者： Deng Hao Guo Aiying Ran Feng Microelectronic Research & Development Center Shanghai UniversityShanghai200444China Key Laboratory of Advanced Display and System Applications Shanghai UniversityShanghai200072 China

ISBN: (数字)9780738111889

ISBN: (纸本)9781665419642

In order to solve the problem of high bandwidth data volume and low power consumption of OLEDoS microdisplay panels,this paper proposes a new type of digital low-power pixel *** driving circuit includes a plurality of pixel driving units,which can store multi-pixel bit information at one time,thereby reducing the amount of data read *** with the traditional digital pixel circuit,the proposed circuit can skip the grayscale data writing process when the picture is still or the rate of change is low,thus reducing the data flow and power consumption.

关键词： Microdisplays Organic light emitting diodes Writing MOSFET Brightness Power demand Integrated circuit modeling

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Influence of reaction parameters on the luminescence properties of monodisperse NaGd（1-x-y）（WO4）2:xEu3+,yTb3+ phosphor by molten salt synthesis

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Journal of Rare Earths 2018年第1期36卷 49-57页

作者： Weiqin Xiao Luqiao Yin Jipeng Zhou Fang Lei Ying Shi Jianjun Xie Lei Zhang School of Materials Science and Engineering Shanghai University Key Laboratory of Advanced Display and System Applications Ministry of Education (Shanghai University)

Eu3+activated and Eu3+, Tb3+co-activated monodisperse sodium double tungstates NaGd（WO4）2 phosphors were prepared by molten salt method at 750 ℃ for 10 h using NaCl as a flux. The crystal structure and morphology of the as-synthesized phosphors were measured by XRD and SEM, respectively. The photoluminescence properties were characterized by PL spectra, decay lifetime and CIE. The presence of NaCl plays an important role in the morphology and luminescence properties. In this work,NaCl and one of the raw material Na2CO3in a certain proportion will form a low eutectic salt to decrease the reaction temperature and benefit the formation of monodisperse NaGd（WO4）2crystals. The color of Eu3+and Tb3+co-doped NaGd（WO4）2phosphors can be tuned from creamy white to orange, red and green by adjusting the doping concentration of rare earth ions, since the emission contain the broad blue-green emission origin from NaGd（WO4）2host and characteristic red and green emission origin from Eu3+and Tb3+ions. The electroluminescent spectra and CIE measurement shows that the LED device with NaGd（1-x）（WO4）2:xEu3+（x = 0.24） phosphor can be excited by 365 nm and 380 nm LED chip, and their CIE coordinate is（x = 0.45, y = 0.45） and（x = 0.36, y = 0.37）, Ra is 80.3 and 86.3, Tcis 3196 and4556 K, respectively. As a single-component phosphor, NaGd（WO4）2:Eu3+,Tb3+have potential application in UV-pumped WLEDs.

关键词： NaGd（1-x-y）（WO4）2:xEu3+ yTb3+ Molten salt method Single component WLEDs White light

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P-13.3: Thermally Activated Delayed Fluorescent Host for Highly Efficient and Stable Deep-Red OLEDs

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SID Symposium Digest of Technical Papers 2022年第S1期53卷

作者： Ke Wang Rongrong Xia Jianfeng Guo Zhen Zhang Zixing Wang Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University 149 Yanchang Rd. Shanghai 200072 P. R. China

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Molecular tailoring towards two-dimensional organic crystals at the thickness limit

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Chinese Chemical Letters 2025年第9期36卷

作者： Zhilei Zhang Yanan Sun Xiaosong Shi Xiaozhe Yin Dawei Liu Erjing Wang Jie Liu Yuanyuan Hu Lang Jiang Beijing National Laboratory for Molecular Sciences Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China University of the Chinese Academy of Sciences Beijing 100049 China Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials Faculty of Materials Science and Engineering Hubei University Wuhan 430062 China Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education & International Science and Technology Innovation Cooperation Base for Advanced Display Technologies of Hunan Province School of Physics and Electronics Hunan University Changsha 410082 China

Advances in controllable growth of ultrathin two-dimensional molecular crystals (2DMCs) or even monolayer molecular crystals (MMCs) propelled their application in high-performance, high-sensitivity, low-contact-resistance optoelectronic devices. However, the rational molecular design strategies for materials prone to grow into ultrathin 2DMC or MMC have rarely been addressed. Here, systematically tailoring the π -conjugation and alkyl chain types of asymmetric anthracene derivatives, 2DMCs and even MMCs were obtained under the synergetic regulation of inter- and intralayer interactions. High-quality MMCs were obtained for SAP-C6 by traditional physical vapor transport technique (PVT), and corresponding organic field-effect transistors (OFETs) exhibited high mobility of 3.22 cm 2 V -1 s -1 . In addition, band-like charge transport with low activation energy was achieved by SAP-C6 MMC-OFETs. Furthermore, the SAP-C6 MMC-based device exhibits excellent thermal stability, retaining ∼70 % of its initial performance at 140 °C in air, which is the first report on the thermal stability of MMC devices. This research highlights the potential of alkyl-substituted asymmetric molecules as a design strategy to achieve ultrathin 2DMC or MMC growth, and improve the mobility and thermal stability in OFETs.

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Towards the integration of nanoemitters by direct laser writing on optical glass waveguides

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Photonics Research 2020年第9期8卷 1541-1550页

作者： XIAOLUN XU AURÉLIE BROUSSIER TIZIANA RITACCO MACKRINE NAHRA FABIEN GEOFFRAY ALI ISSA SAFI JRADI RENAUD BACHELOT CHRISTOPHE COUTEAU AND SYLVAIN BLAIZE Light nanomaterialsnanotechnologies(L2n)ERL 7004CNRS.University of Technology of Troyes12 rue Marie Curie10004 Troyes CedexFrance Teem Photonics 61 Chemin du Vieux Chêne38246 MeylanFrance Key Laboratory of Advanced Display and System Application Ministry of EducationSchool of Mechatronic Engineering and AutomationShanghai UniversityShanghai 200072China Sino-European School of Technology Shanghai UniversityShanghai 200044China

A major challenge towards nanophotonics is the integration of nanoemitters on optical *** the optical properties of nanoemitters with the benefits of integration and scalability of integrated optics is still a major issue to *** this work,we demonstrate the integration of nanoemitters positioned in a controlled manner onto a substrate and onto an optical ion-exchanged glass waveguide via direct laser writing based on twophoton *** nanoemitters are colloidal CdSe/ZnS quantum dots(QDs)embedded in polymeric *** varying the laser parameters during the patterning process,we make size-controlled QDpolymer nanostructures that were systematically characterized using optical and structural *** as small as 17 nm in height were *** well-controlled QD-polymer nanostructure systems were then successfully integrated onto a new photonic platform for nanophotonics made of an ion-exchanged *** show that our QDs maintain their light emitting quality after integration as verified by photoluminescence(PL)***,QD emission coupled to our waveguides is detected through a home-built fiber-edge coupling PL measurement *** results show the potential for future integration of nanoemitters onto complex photonic chips.

关键词： emitter optical waveguides

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AMOLED Encapsulation Technology and Prospect

AMOLED Encapsulation Technology and Prospect

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International Conference on display Technology, ICDT 2018

作者： Ao, Wei Li, Chunhong Wang, Yan Liu, Xiangchao Xin, Xiaogang Gao, Feng Peng, Chaochi Zhang, Jianhua Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai University Shanghai200072 China

ISBN: (纸本)9781510867659

The flexible organic light emitting diodes (OLEDs) has attracted a lot of attention because of its very wide and promising application prospect. The flexible encapsulation is a most problem for mass production of flexible OLEDs since their sensitivity to water and oxygen. Traditional flexible encapsulation using plasma enhanced chemical vapor deposition (PECVD) film as the inorganic layer. However owing to the complicated pattern of sub-layer and particles, the poor step coverage of PECVD film results in bad encapsulation properties. Therefore the plasma enhanced atomic layer deposition (PEALD) is studied on account of its better step coverage and lower growth temperature. Firstly, the PECVD SiNx process has been researched to achieve the low water vapor transmission rate (WVTR) (WVTR*10-4g m-2day-1) and low stress ( © 2018 SID.

关键词： Plasma enhanced chemical vapor deposition

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