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Investigation of post-thermal annealing-induced enhancement in photovoltaic performance for squaraine-based organic solar cells

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Frontiers of Materials Science 2020年第1期14卷 81-88页

作者： Rui Zhu Feiyang Liu Zixing Wang Bin Wei Guo Chen Key Laboratory of Advanced Display and System Applications(Ministry of Education) Shanghai UniversityYanchang Road 149Shanghai200072China School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang212003China

In this work,we have systematically investigated the post-thermal annealing-induced enhancement in photovoltaic performance of a 2,4-bis[4-(N,N-diisobutylamino)-2,6-dihydroxyphenyl]squaraine(DIBSQ)/C60 planar heterojunction(PHJ)organic solar cells(OSCs).An increased power conversion efficiency(PCE)of 3.28%has been realized from a DIBSQ/C60 device with thermal annealing at 100°C for 4 min,which is about 33%enhancement compared with that of the as-cast *** improvement of the device performance may be mainly ascribed to the crystallinity of the DIBSQ film with post-thermal annealing,which will change the DIBSQ donor and C60 acceptor interface from^PHJ to hybrid planar-mixed *** new donor-acceptor heterojunction structure will significantly improve the charge separation and charge collection efficiency,as well as the open circuit voltage(Voc)of the device,leading to an enhanced *** work provides an effective strategy to improve the photovoltaic performance of SQ-based OSCs.

关键词： organic solar cell squaraine dye post-thermal annealing donor/acceptor interface power conversion efficiency

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Research on panoramic illumination imaging system based on SURF algorithm 18

Research on panoramic illumination imaging system based on S...

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18th China International Forum on Solid State Lighting and 7th International Forum on Wide Bandgap Semiconductors, SSLChina: IFWS 2021

作者： Wang, Fei Ji, Xiaoxiao Yin, Luqiao Guo, Aiying Zhang, Jianhua Shanghai University School of Microelectronics Shanghai201800 China Shanghai University Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai200072 China School of Mechatronic Engineering and Automation Shanghai University Shanghai200072 China

ISBN: (纸本)9781665495462

Underwater lighting systems and imaging systems are mainly used in underwater pipeline internal inspection, underwater environment information collection, resource detection, etc. This article explores a panoramic lighting imaging system based on an underwater environment. Mainly from the intelligent lighting system, panoramic imaging system, and system integration optimization. The intelligent lighting system mainly explores a high-brightness intelligent lighting device with a high-brightness lighting system. The imaging system mainly works in conjunction with the lighting system. The imaging system mainly collects 250° panoramic picture information and 250° video information for scientific research and other tasks. Provide appropriate information and data. Finally, system integration optimization and joint work are carried out. © 2021 IEEE.

关键词： Imaging systems

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Simulation study on thermal mechanical properties of 4×4 Micro-LED array in flip-chip bonding process 18

Simulation study on thermal mechanical properties of 4×4 Mi...

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18th China International Forum on Solid State Lighting and 7th International Forum on Wide Bandgap Semiconductors, SSLChina: IFWS 2021

作者： Ji, Xiaoxiao Wang, Fei Yin, Luqiao Zhang, Jianhua Shanghai University Ministry of Education Key Laboratory of Advanced Display and System Applications Shanghai200072 China School of Mechatronic Engineering and Automation Shanghai University Shanghai200072 China School of Microelectronics Shanghai University Shanghai201800 China

ISBN: (纸本)9781665495462

With the advent of the Micro-light-emitting diodes, it has become the focus of display and visible light communication research. However, as the LED chip size shrinks, the difficulty of integration increase gradually. Nowadays, the integration of Micro- LEDs in display is still a challenge for commercialization. In this work, we conducted a comparative study by finite element method simulation to reveal the influencing factors of bonding yield. The results show that stress concentrates at the junction of the bumps and electrodes of Micro-LED chips, and the stress concentration at the corner of Micro-LED array is more seriously. By altering the parameters of bumps, such as shapes and materials to reduce the stress and stress concentration. Numerical simulate results provide theoretical basis for reducing stress and stress concentration and optimizing the bump shape. © 2021 IEEE.

关键词： Light emitting diodes

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Light-emitting field-effect transistors with EQE over 20%enabled by a dielectric-quantum dots-dielectric sandwich structure

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Science Bulletin 2022年第5期67卷 529-536,M0004页

作者： Lingmei Kong Jialong Wu Yunguo Li Fan Cao Feijiu Wang Qianqian Wu Piaoyang Shen Chengxi Zhang Yun Luo Lin Wang Lyudmila Turyanska Xingwei Ding Jianhua Zhang Yongbiao Zhao Xuyong Yang Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai UniversityShanghai 200072China CAS Key Laboratory of Crust-Mantle Materials and Environments School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China Henan Key Laboratory of Photovoltaic Materials Henan UniversityKaifeng 475004China Faculty of Engineering University of NottinghamNottingham NG72RDUK Center for Optoelectronic Engineering Research Department of PhysicsSchool of Physics and AstronomyYunnan UniversityKunming 650091China

Emerging quantum dots(QDs)based light-emitting field-effect transistors(QLEFETs)could generate light emission with high color purity and provide facile route to tune optoelectronic properties at a low fabrication *** efforts have been devoted to designing device structure and to understanding the underlying physics,yet the overall performance of QLEFETs remains low due to the charge/exciton loss at the interface and the large band offset of a QD layer with respect to the adjacent carrier transport ***,we report highly efficient QLEFETs with an external quantum efficiency(EQE)of over 20%by employing a dielectric-QDs-dielectric(DQD)sandwich *** DQD structure is used to control the carrier behavior by modulating energy band alignment,thus shifting the exciton recombination zone into the emissive ***,enhanced radiative recombination is achieved by preventing the exciton loss due to presence of surface traps and the luminescence quenching induced by interfacial charge *** DQD sandwiched design presents a new concept to improve the electroluminescence performance of QLEFETs,which can be transferred to other material systems and hence can facilitate exploitation of QDs in a new type of optoelectronic devices.

关键词： Light-emitting field-effect transistors Quantum dots Electroluminescence External quantum efficiency

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51-1:Invited Paper:Optimizing Photonic Annealing Technique for Full-Solution-Processed Oxide Thin Film Transistor

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SID Symposium Digest of Technical Papers 2024年第S1期55卷 450-450页

作者： Meng Xu Xifeng Li Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai University Shanghai China 200072

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Computational Analysis of Quantum Dots as Color Conversion Layer for Micro-LED applications 18

Computational Analysis of Quantum Dots as Color Conversion L...

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18th China International Forum on Solid State Lighting and 7th International Forum on Wide Bandgap Semiconductors, SSLChina: IFWS 2021

作者： Lin, Pengsen Ji, Xiaoxiao Yin, Luqiao Zhang, Jianhua Shanghai University School of Materials Science and Engineering Shanghai200072 China Shanghai University Ministry of Education Key Laboratory of Advanced Display and System Applications Shanghai200072 China School of Mechatronics and Automation Shanghai University Shanghai200072 China

ISBN: (纸本)9781665495462

We propose a simulation scheme for studying quantum dot (QD) light effects of full-color micro-light-emitting-diode (micro-LED) arrays. We have studied the influence of QD thickness and concentration on light efficiency. The results show that the QD concentration and thickness have an impact on the light efficiency. When the thickness of the QD is 5 μm, or the maximum light conversion efficiency can be obtained when the concentration is 0.1 mol/L. By analyzing the light field distribution of different QD thicknesses, the light crosstalk phenomenon is observed. This kind of crosstalk can cause blurry display images and should be avoided. © 2021 IEEE.

关键词： Crosstalk

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An Optical Tracking system with Defaced Marker Detection 4

An Optical Tracking System with Defaced Marker Detection

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4th International Conference on Sensors, Signal and Image Processing, SSIP 2021

作者： Qiu, Yu Zheng, Zhao Ou, Ruidi Hu, Xiaoming Fan, Jingfan Yang, Jian Beijing Engineering Research Center Of Mixed Reality And Advanced Display School Of Optics And Photonics Beijing Institute of Technology China Key Laboratory Of Convergence Medical Engineering System And Healthcare Technology School Of Life Science Beijing Institute of Technology China

ISBN: (纸本)9781450385725

Optical tracking systems (OTSs) have been widely used in clinical practice to fulfill the high precision needs of contemporary surgery. The markers that are defaced in the production or surgery reduce the accuracy and tracking range of OTS. This effect was not considered in current products from either industry or academia. In this paper, we propose an OTS which can detect the defaced markers automatically. A stereo camera module is set to track surgical instruments by locating the markers affixed to them. An adaptive threshold approach is suggested to locate the markers. The typical fiducial localization error of our OTS reaches 0.28 mm, which is totally comparable to commercial devices. A defaced marker detection method based on the luminous energy model of OTS is proposed and can be used to recognize the defaced markers regardless of their relative positions to the OTS. © 2021 ACM.

关键词： Stereo image processing

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Instability Mechanism of Phosphomolybdic Acid Solution and its Effect on Organic Solar Cells as a Hole-Transporting Layer

SSRN

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SSRN 2023年

作者： Chen, Guo Qu, Minghao Li, Yaozhao Li, Peng Yang, Xuyong Wei, Bin School of Materials Science and Engineering Shanghai University Shanghai200072 China School of Medicine Shanghai University Shanghai200444 China Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University Yanchang Road 149 Shanghai200072 China

Phosphomolybdic acid (H3PMo12O40, PMA) containing twelve MoO3 units exhibits an efficient hole-transporting property in organic electronics. Low-cost, easy synthesis and high thermal-stability PMA is promising solution-processed hole-transporting material for high efficiency organic solar cells (OSCs). We have studied the degradation mechanism of phosphomolybdic acid in methanol solution that was stored for days, and further investigated its effect on the performance of OSC devices. We found that PMA had been slowly reduced to phosphomolybdic heteropoly blue during the solution storage process. Besides the morphology of the PMA film, its energy level and molybdenum valence which changed with solution storage time were also investigated. The instability of PMA in methanol solution resulted in a significant negative effect on the device performance. Comparing to the PM6:Y6 device based on PMA from pristine solution, the power conversion efficiencies of OSCs with PMA hole transporting layer prepared from solution stored for 8 days and 16 days decreased from 14.69% to 3.01% and 0.58%, respectively. Fortunately, using other stable processing solvent systems instead of methanol for the fabrication of the PMA hole transporting layer has been found as an efficient method to avoid the degration of the device performance. © 2023, The Authors. All rights reserved.

关键词： Stability

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High Color Gamut Top-Emitting Organic Light-Emitting Diode Based on Metal/Transparent Conductive Oxide Composite Electrode

SSRN

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SSRN 2025年

作者： Lin, Yang Zhu, Yangyang Zhao, Ben Gu, Jialu Xu, Yachen Lan, Weixia Chen, Guo Shi, Wei Kido, Junji Wei, Bin Shanxi Datong University China School of Mechatronic Engineering and Automation Shanghai University Shanghai200072 China Shanghai Engineering Research Center for Integrated Circuits and Advanced Display Materials Shanghai University Shanghai200072 China Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University Shanghai200072 China Nanan Institute Shanghai University Nan'an Fujian Quanzhou362300 China Frontier Center for Organic Materials Yamagata University 4-3-16 Jonan Yonezawa992-8510 Japan

Top-emitting organic light-emitting diodes (TEOLEDs) based on metal/transparent conductive oxide composite anodes, which were Al/ITO and Ag/ITO, were studied. The microcavity effect was optimized by adjusting the microcavity thickness and microcavity order to achieve high color gamut RGB monochromatic light display. Through mathematical modeling and spectral simulation, TEOLEDs with different microcavity structures were designed. The results showed that the full width at half maximum and the color purity of the light of the TEOLED based on the second-order microcavity were significantly optimized compared to those of the TEOLED based on the first-order microcavity. Meanwhile, the TEOLEDs based on the Ag/ITO composite electrode exhibited better optoelectronic performance, with the significantly enhanced external quantum efficiency of up to 19.40%, narrower full width at half maximum of down to 20 nm, and improved color purity. The corresponding red, green, and blue TEOLEDs had achieved excellent color coordinates of (0.697, 0.301), (0.154, 0.769), and (0.139, 0.050), and the color gamut area of the device had reached 172.4% of the color gamut area of the bottom-emitting OLED, 125.6% of the National Television system Committee standard color gamut, and 93.8% of the ITU-R Recommendation BT.2020 standard color gamut. © 2025, The Authors. All rights reserved.

关键词： Organic light emitting diodes (OLED)

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Thermodynamic simulation of 6×6 Micro-LED array in flip-chip bonding

Thermodynamic simulation of 6×6 Micro-LED array in flip-chi...

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China International Forum o Solid State Lighting: International Forum on Wide Bandgap Semiconductors China (SSLChina: IFWS)

作者： Haojie Zhou Xiaoxiao Ji Luqiao Yin Jianhua Zhang School of Materials Science and Engineering Shanghai University Shanghai China Key Laboratory of Advanced Display and System Applications Shanghai University Ministry of Education Shanghai China School of Mechatronics and Automation Shanghai University Shanghai China School of Microelectronics Shanghai University Shanghai China

In this paper, we first simulated the influence of different diameters, heights and shapes on the In bumps by ANSYS simulation software. The results show that the changes of these conditions affect the deformation and stress of the In bumps to varying degrees. The height of the bumps has the least effect on the stress, while the diameter and shape of the bumps have a great effect on the deformation as well as stress. Finally, a sapphire based Mirco-LED array with a pixel pitch size of 7.5 μm was used to bond with silicon substrates with In bumps of different heights, and turn it on with electricity. We found that the In bumps height does affect the yield of Micro-LED, and the best yield in the experiment is > 90%. This study provides a theoretical basis for reducing the deformation and stress of In bumps during flip-chip bonding, and an experimental basis for improving bond yield and device performance.

关键词： Thermodynamics Deformation Shape Simulation Software Silicon Flip-chip devices

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