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materials and Processes for Nonvolatile Memories

作者： Ganguly, Udayan Lee, Chungho Kan, Edwin C. Department of Materials Science and Engineering Cornell University School of Electrical and Computer Engineering Cornell University

Molecular interface with CMOS is an area indispensable to the enhancement of our understanding of the nano-scale world. We report the integration of fullerenes in CMOS gate stack and demonstrate a functional molecular interface by effecting molecular redox operations through non-volatile charge injection in an EEPROM-type device. The gate stack of the MOS capacitor consists of a tunneling thermal oxide. A sub-monolayer of fullerenes is deposited. Then the control oxide is deposited and finally the gate metal is patterned. Charge injection occurs at a specific potential of the fullerene molecules with respect to the conduction band of Si at the Si/SiO2 interface, independent of the concentration of the fullerene sub-monolayer. This strongly indicates molecular redox in solid state that is electrostatically controllable. Such molecular interfaces can be used to enhance the spatial sensitivity of chemical sensors like the CvMOS to be able to interface with macromolecular systems. © 2005 materials Research Society.

关键词： Fullerenes

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Curvy surface conformal ultra-thin transfer printed Sioptoelectronic penetrating microprobe arrays

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npj Flexible Electronics 2018年第1期2卷 8-13页

作者： Kyoseung Sim Zhoulyu Rao Yanbin Li Dong Yang Cunjiang Yu Materials Science and Engineering Program University of HoustonHoustonTX 77204USA Department of Mechanical Engineering University of HoustonHoustonTX 77204USA Department of Electrical and Computer Engineering University of HoustonHoustonTX 77204USA Department of Biomedical Engineering University of HoustonHoustonTX 77204USA

Penetrating neural probe arrays are powerful bio-integrated devices for studying basic neuroscience and applied neurophysiology,underlying neurological disorders,and understanding and regulating animal and human *** paper presents a penetrating microprobe array constructed in thin and flexible fashion,which can be seamlessly integrated with the soft curvy *** function of the microprobes is enabled by transfer printed ultra-thin Si *** a proof-of-concept device,microprobe array with Si photodetector arrays are demonstrated and their capability of mapping the photo intensity in space are *** design strategies of utilizing thin polyimide based microprobes and supporting substrate,and employing the heterogeneously integrated thin optoelectronics are keys to accomplish such a *** experimental and theoretical investigations illustrate the materials,manufacturing,mechanical and optoelectronic aspects of the *** this paper primarily focuses on the device platform development,the associated materials,manufacturing technologies,and device design strategy are applicable to more complex and multi-functionalities in penetrating probe array-based neural interfaces and can also find potential utilities in a wide range of bio-integrated systems.

关键词： optoelectronic arrays transfer

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An Analysis of the Effects of Interface Recombination on the Transient Response of Double Heterojunction Devices

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IEEE Journal of Quantum Electronics 1977年第9期13卷 783-791页

作者： Armiento, Craig A. Fonstad, Clifton G. Department of Electrical Engineering and Computer Science Center for Materials Science and Engineering Massachusetts Institute of Technology Cambridge MA 02139 United States

An exact transient solution is presented for the spatial and temporal variation of the injected minority carrier distribution and for the total number of injected minority carriers in a double heterojunction device, e.g., a light-emitting diode (LED) or diode laser, in the presence of interface recombination centers at the heterojunction boundaries, with finite minority carrier lifetime in the center region, and for current pulse excitation. The solution for the model assumed is completely general and can be applied to any material or dimensional situation;for purposes of illustration, numerical results appropriate for typical III-V or Pb-salt heterostructures are presented. It is shown that for the total number of injected minority carriers, an effective minority carrier lifetime can, in certain cases, be defined which is a function of the interfacial recombination centers, the minority carrier lifetime, and the middle or “active” region width. The practical implications of this and other results for device performance and analysis are discussed. © 1977, IEEE. All rights reserved.

关键词： Transient response Heterojunctions Charge carrier lifetime Light emitting diodes III-V semiconductor materials Diode lasers Optical pulses Laser excitation Optical materials Performance analysis

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Highly efficient ternary organic solar cells with excellent open-circuit voltage and fill factor via precisely tuning molecular stacking and morphology

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science China Chemistry 2024年第3期67卷 963-972页

作者： Dinghong Sun Zhenyu Chen Jianfeng Zhang Wei Song Jingyu Shi Jintao Zhu Yuanyuan Meng Fei Jin Shuncheng Yang Ziyi Ge Faculty of Electrical Engineering and Computer Science Ningbo UniversityNingbo 315211China Faculty of Material Science and Chemical Engineering Ningbo UniversityNingbo 315211China Zhejiang Provincial Engineering Research Center of Energy Optoelectronic Materials and Devices Ningbo Institute of Materials Technology&EngineeringChinese Academy of SciencesNingbo 315201China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049China Department of Chemical and Environmental Engineering University of Nottingham NingboNingbo 315100China

The micro-morphology and molecular stacking play a key role in determining the charge transport process and nonradiative energy loss, thus impacting the performances of organic solar cells(OSCs). To address this issue, a non-fullerene acceptor PhC6-IC-F with alkylbenzene side-chain, possessing optimized molecular stacking, complementary absorption spectra and forming a cascade energy level alignment in the PM6:BTP-eC9 blend, is introduced as guest acceptor to improve efficiency of ternary OSCs. The bulky phenyl in the side-chain can regulate crystallinity and optimizing phase separation between receptors in ternary blend films, resulting in the optimal phase separations in the ternary films. As a result, high efficiencies of 18.33% as photovoltaic layer are obtained for PhC6-IC-F-based ternary devices with excellent fill factor(FF) of 78.92%. Impressively, the ternary system produces a significantly improved open circuit voltage(V_(oc)) of 0.857 V compared with the binary device,contributing to the reduced density of trap states and suppressed non-radiative recombination result in lower energy loss. This work demonstrates an effective approach for adjusting the aggregation, molecular packing and fine phase separation morphology to increase V_(oc) and FF, paving the way toward high-efficiency OSCs.

关键词： alkylbenzene side-chain morphology regulation ternary blends organic solar cells

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Development of carbon nanotubes vacuum field emission differential amplifier integrated circuit

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Journal of Vacuum science and Technology B: Microelectronics and Nanometer Structures 2007年第2期25卷 627-630页

作者： Wong, Y.M. Kang, W.P. Davidson, J.L. Kerns, D.V. Huang, J.H. Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN 37235 Olin College of Engineering Needham MA 02492 Department of Materials Science and Engineering National Tsing Hua University Hsinchu 300 Taiwan

The authors have recently presented a novel concept for the development of vacuum field emission (VFE) differential amplifier (diff-amp) based on a matched pair of carbon nanotube (CNT) triodes and reported the preliminary device characteristics. In this study, they report the development of a CNT VFE diff-amp using CNT emitter arrays with smaller gate aperture, obtaining better device performance after postsynthesis rapid thermal annealing treatment. A pair of well-matched 2 μm circular triode arrays showed a gate turn-on voltage of ∼40 V and displayed similar triode characteristics in the saturation region. Moreover, the proposed two-step analytical model shows that the common-mode rejection ratio (CMRR) in decibels has a linear relationship with the applied gate voltage for the improved dual-triode diff-amp. In addition, the diff-amp demonstrates high CMRR (34-58 dB) over a wide operating region. © 2007 American Vacuum Society.

关键词： Carbon nanotubes

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Bi_(2)O_(2)Se nanoplates for broadband photodetector and full-color imaging applications

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Nano Research 2023年第5期16卷 7638-7645页

作者： Han Wang Songqing Zhang Xingxuan Wu Huijia Luo Junliang Liu Zesheng Mu Ruirui Liu Guang Yuan Yujun Liang Jin Tan Yongling Ren Wen Lei Department of Electrical Electronic and Computer EngineeringThe University of Western AustraliaCrawley 6009Australia Department of Electronic Engineering School of IOT engineeringJiangnan UniversityWuxi 214122China College of Information Science and Engineering Ocean University of ChinaQingdao 266100China Faculty of Materials Science and Chemistry China University of GeosciencesWuhan 430074China

Broadband light detection and sensing are widely applied in modern *** a promising candidate for next-generation two-dimensional(2D)optoelectronic material,bismuth oxyselenide(Bi_(2)O_(2)Se)nanoplates exhibit many prospects in the application of visible light detection due to their peculiar *** this work,we report the photodetection performance of single-crystal 2D Bi_(2)O_(2)Se nanoplates grown on SiO_(2)based on a ternary-alloy growth model by utilizing chemical vapor deposition(CVD).The Bi_(2)O_(2)Se nanoplates were found to have an even and uniform square shape with side lengths up to 15μm and an approximate thickness of 15 nm.A visible-light photodetector was fabricated based on a CVD-grown Bi_(2)O_(2)Se nanoplate,and characterized by a set of illumination experiments using a 400 nm laser at temperatures ranging from 77 to 370 *** device exhibited superior performance at the temperature of 77 K,with a responsivity of 523 A/W,a specific detectivity of 1.37×10^(11)Jones,a response time of 0.2175 ms,an external quantum efficiency of 162,119.44%,resulting in high-quality and fullcolor imaging in the visible *** results indicate that the single-crystalline Bi_(2)O_(2)Se nanoplates have excellent potential in broadband photodetection and non-cryogenic imaging.

关键词： two-dimensional(2D)nanomaterial Bi_(2)O_(2)Se nanoplates chemical vapor deposition broadband light detection full-color imaging

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Energy Bands and Breakdown Characteristics in Al2O3/UWBG AlGaN Heterostructures

arXiv

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arXiv 2025年

作者： Shin, Seungheon Liddy, Kyle Zhu, Yinxuan Joishi, Chandan Klein, Brianna A. Armstrong, Andrew Allerman, Andrew A. Rajan, Siddharth Department of Electrical and Computer Engineering The Ohio State University ColumbusOH43210 United States Department of Materials Science and Engineering The Ohio State University ColumbusOH43210 United States Sandia National Laboratories AlbuquerqueNM87123 United States

We report on energy bands and breakdown characteristics of Al2O3 dielectrics on ultra-wide bandgap (UWBG) AlGaN heterostructures. Metal-dielectric-semiconductor structures are important to sustain high fields needed for future high-performance UWBG transistors. Using systematic experiments, we determined the fixed charge density (> 1013 cm-2) the dielectric/interface, and electric fields in the oxide of under flat-band conditions in the semiconductor. Low gate-to-drain leakage current of up to 5 × 10-7 A/cm2 were obtained in the metal-oxide-semiconductor structures. In lateral metal-semiconductor-insulator test structures, breakdown voltage exceeding 1 kV was obtained with a channel sheet charge density of 1.27 × 1013 cm-2. The effective peak electric field and average breakdown field were estimated to be > 4.27 MV/cm and 1.99 MV/cm, respectively. These findings demonstrate the potential of Al2O3 integration for enhancing the breakdown performance of UWBG AlGaN HEMTs. Copyright © 2025, The Authors. All rights reserved.

关键词： Aluminum oxide

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Improved Density in Aligned Arrays of Single-Walled Carbon Nanotubes by Sequential Chemical Vapor Deposition on Quartz (vol 22, pg 1826, 2010)

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ADVANCED materials 2010年第45期22卷 CP30-CP30页

作者： Hong, Suck Won Banks, Tony Rogers, John A. Department of Materials Science and Engineering Chemistry Mechanical Science and Engineering Electrical and Computer Engineering Beckman Institute for Advanced Science and Technology Frederick Seitz Materials Research Laboratory University of Illinois at Urbana-Champaign Urbana Illinois 61801 (USA) Department of Materials Science and Engineering Frederick Seitz Materials Research Laboratory University of Illinois at Urbana-Champaign Urbana Illinois 61801 (USA) Frederick Seitz Materials Research Laboratory University of Illinois at Urbana-Champaign Urbana Illinois 61801 (USA) Email: John A. Rogers (jrogers@uiuc.edu) *Correspondence: John A. Rogers Department of Materials Science and Engineering Chemistry Mechanical Science and Engineering Electrical and Computer Engineering Beckman Institute for Advanced Science and Technology Frederick Seitz Materials Research Laboratory University of Illinois at Urbana-Champaign Urbana Illinois 61801 (USA).

An approach to formation of high-density, horizontally aligned arrays of pristine, individual single-walled carbon nanotubes (see image) is presented. The method involves multiple cycles of chemical vapor deposition g... 详细信息

关键词： Aligned arrays Carbon nanotubes Chemical vapor deposition Surface growth Transistors

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An electrophosphorescent organic light emitting concentrator

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Light(science & Applications) 2014年第1期3卷 161-165页

作者： Jaesang Lee Michael Slootsky Kyusang Lee Yifan Zhang Stephen R Forrest Department of Electrical Engineering and Computer Science University of MichiganAnn ArborMIUSA Department of Physics University of MichiganAnn ArborMIUSA Department of Materials Science and Engineering University of MichiganAnn ArborMIUSA

We demonstrate threefold directional light concentration from an organic light-emitting diode luminaire for use in spot lighting and other applications where high intensity illumination is *** concentrating luminaire comprises four triangular,large-area green electrophosphorescent organic light emitting diodes(PHOLEDs)deposited on plastic substrates and assembled into a pyramidal structure with an open base that serves as the light exit *** PHOLED surfaces are highly reflective to direct the emission from the devices to the aperture independent of the original emission position within the *** far-field intensity profile of the concentrator has a‘batwing’distribution that meets the requirements for general lighting for uniform illumination of planar surfaces.

关键词： large-area PHOLED luminaire phosphorescence plastic substrates

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MicroChannel spatial light modulator as a storage medium

MicroChannel spatial light modulator as a storage medium

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Optical Information Storage 1979

作者： Warde, Cardinal Fisher, Arthur D. Department of Electrical Engineering and Computer Science Center for Materials Science and Engineering CambridgeMA02139 United States

The MicroChannel spatial light modulator is an optically-addressed spatial light modulator that is being developed for low-light-level, real-time, optical signal processing. In addition to its framed or continuous real-time mode of operation, it can also be used for short-time (hours), low resolution (less than 20 cycles/mm) optical information storage. In this Paper we describe the structure of the device, its principles of operation, some of its preliminary characteristics, and the first attempts at optical information storage. © 1979 SPIE. All rights reserved.

关键词： Microchannels

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