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Pulsed Laser Deposition Films Based on CdSe-Doped Zinc Aluminophosphate Glass
摘要： A composite material with applications in optoelectronics has been investigated. Pulsed laser deposition CdSe-doped glass film was prepared by the combinatorial deposition from two targets, namely pure CdSe and glass belonging to the 20Li2O-10Al2O3-7BaO-2La2O3-2ZnO-59P2O5 system. Exciton peaks in the Vis domain, related to electron–hole pairs transitions from the valence band to the conduction band, were revealed in the optical absorption spectra of the CdSe-doped film. CdSe quantum dots (QDs) band gap energy depends on the CdSe quantum confinement effect. CdSe-doped film photoluminescence exhibits peaks in the red domain assigned to CdSe transitions from the excited state to the ground state. The size of CdSe nanoclusters, determined from x-ray diffraction is correlated with scanning electron microscopy–energy dispersive x-ray spectroscopy and atomic force microscopy results. Vibration modes specific both to CdSe QDs and to the vitreous network have been evidenced by Fourier transform infrared and Raman spectroscopy.
关键词： quantum dots,optoelectronics,zinc aluminophosphate glass,pulsed laser deposition,CdSe
更新于2025-09-23 15:21:01
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Terahertz Optoelectronics in Graphene
摘要： Graphene has attracted considerable attention due to its extraordinary carrier transport, optoelectronic, and plasmonic properties originated from its gapless and linear energy spectra enabling various functionalities with extremely high quantum efficiencies that could never be obtained in any existing materials. This paper reviews recent advances in graphene optoelectronics particularly focused on the physics and device functionalities in the terahertz (THz) electromagnetic spectral range. Optical response of graphene is characterized by its optical conductivity and nonequilibrium carrier energy relaxation dynamics, enabling amplification of THz radiation when it is optically or electrically pumped. Current-injection THz lasing has been realized very recently. Graphene plasmon polaritons can greatly enhance the THz light and graphene matter interaction, enabling giant enhancement in detector responsivity as well as amplifier/laser gain. Graphene-based van der Waals heterostructures could give more interesting and energy-efficient functionalities.
关键词： graphene,plasmon,terahertz,laser,optoelectronics
更新于2025-09-23 15:21:01
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2D Crystals in Three Dimensions: Electronic Decoupling of Single-Layered Platelets in Colloidal Nanoparticles
摘要： 2D crystals, single sheets of layered materials, often show distinct properties desired for optoelectronic applications, such as larger and direct band gaps, valley- and spin-orbit effects. Being atomically thin, the low amount of material is a bottleneck in photophysical and photochemical applications. Here, the formation of stacks of 2D crystals intercalated with small surfactant molecules is proposed. It is shown, using first principles calculations, that the very short surfactant methyl amine electronically decouples the layers. The indirect–direct band gap transition characteristic for Group 6 transition metal dichalcogenides is demonstrated experimentally by observing the emergence of a strong photoluminescence signal for ethoxide-intercalated WSe2 and MoSe2 multilayered nanoparticles with lateral size of about 10 nm and beyond. The proposed hybrid materials offer the highest possible density of the 2D crystals with electronic properties typical of monolayers. Variation of the surfactant’s chemical potential allows fine-tuning of electronic properties and potentially elimination of trap states caused by defects.
关键词： intercalates,photoluminescence,optoelectronics,2D materials,heterostructures
更新于2025-09-23 15:21:01
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Enhanced Charge Transfer and Responsivity in Hybrid Quantum Dot/Graphene Photodetectors Using ZnO as Intermediate Electrona??Collecting Layer
摘要： Hybrid graphene (Gr)–quantum dot (QD) photodetectors have shown ultra-high photoresponsivity combining the strong light absorption of QDs with the high mobility of Gr. QDs absorb light and generate photocarriers that are efficiently transported by Gr. Typically, hybrid PbS–QD/graphene photodetectors operate by transferring photogenerated holes from the QDs to Gr while photoelectrons stay in the QDs inducing a photogating mechanism that achieves a responsivity of 6 × 107 A W?1. However, despite such high gain, these systems have poor charge collection with quantum efficiency below 25%. Herein, a ZnO intermediate layer (PbS-QD/ZnO/Gr) is introduced to improve charge collection by forming an effective p-n PbS-ZnO junction driving the electrons to the ZnO layer and then to Gr. This improves the photoresponsivity of the devices by nearly an order of magnitude with respect to devices without ZnO. Charge transfer to Gr is demonstrated by monitoring the change in Fermi level under illumination for conventional PbS-QD/Gr and for ZnO intermediate PbS-QD/ZnO/Gr devices. These results improve the capabilities of hybrid QD/Gr configurations for optoelectronic devices.
关键词： PbS quantum dots,graphene,optoelectronics,ZnO intermediate layers
更新于2025-09-23 15:21:01
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[IEEE 2018 19th International Conference on Electronic Packaging Technology (ICEPT) - Shanghai, China (2018.8.8-2018.8.11)] 2018 19th International Conference on Electronic Packaging Technology (ICEPT) - A stretchable translucent conductive film based on polymer microspheres lithography technology
摘要： Transparent and translucent conductor has played an important role in various of photoelectric device electrodes, including photovoltaics (PVs), light-emitting diodes (LEDs), liquid-crystal displays (LCDs), touch-screen panels (TSPs), and radiofrequency identification (RFID) and so on [1, 2]. Some conductive oxides are transparent but do not stretchable. We have confirmed a method based on polystyrene (PS) microspheres to obtain a stretchable transparent conductive film. The homogeneous mono-layer PS microstructure arrays were self-assembled on surface of modified polydimethylsiloxane (PDMS) film, and then the size and spacing distance of the microspheres were adjusted by plasma etching technology to obtain non-closed PS arrays, and the magnetron sputtering technology was used to deposit a layer of conductive metal on the etched microsphere arrays. The stretchable translucent conductive films show relatively high transmittance (53% at 550 nm), and good electrical stability under stretching conditions. They also posses better conformability and conformal on complex curve surfaces than conventional bendable transparent conductive films, and present excellent potential application in flexible electronic and biomedicine fields.
关键词： Stretchable,Polymer microsphere lithography,Self-assembly,Flexible optoelectronics,translucent conductors
更新于2025-09-23 15:21:01
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European Microscopy Congress 2016: Proceedings || New Opportunities in multi-frame STEM Spectroscopy & Fractional Beam-current EELS
摘要： The paper discusses the application of multi-frame super-resolution techniques in the field of optoelectronics, specifically focusing on the enhancement of image quality through the use of advanced algorithms and hardware. It explores the limitations and potential improvements in current methodologies, presenting a novel approach to image processing that leverages both software and hardware innovations.
关键词： hardware acceleration,super-resolution,image processing,multi-frame,optoelectronics
更新于2025-09-23 15:21:01
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Evidence of reversible oxidation at CuInSe <sub/>2</sub> grain boundaries
摘要： Silicon photonics leverages microelectronic fabrication facilities to achieve photonic circuits of unprecedented complexity and cost efficiency. This efficiency does not yet translate to optical packaging, however, which has not evolved substantially from legacy devices. To reach the potential of silicon photonics, we argue that disruptive advances in the packaging cost, scalability in the optical port count, and scalability in the manufacturing volume are required. To attain these, we establish a novel photonic packaging direction based on leveraging existing microelectronics packaging facilities. We demonstrate two approaches to fiber-to-chip interfacing and one to hybrid photonic integration involving direct flip-chip assembly of photonic dies. Self-alignment is used throughout to compensate for insufficient placement accuracy of high-throughput pick and place tools. We show a self-aligned peak transmission of –1.3 dB from standard cleaved fibers to chip and of –1.1 dB from chip to chip. The demonstrated approaches are meant to be universal by simultaneously allowing wide spectral bandwidth for coarse wavelength division multiplexing and large optical-port count.
关键词： flip-chip devices,optical fiber communication,Integrated optoelectronics,packaging,optical polymers
更新于2025-09-23 15:19:57
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IMPROVING THE QUALITY OF PHOTODETECTORS USING ISOTOPIC NANOENGINEERING METHODS
摘要： The study considers the possibility of changing the isotopic composition of a substance to improve the physical properties of the material and the optoelectronic characteristics of a photodetector as the most common device in optoelectronics. It is shown that the reduction of heavy isotopes in the semiconductor material of photodetectors increases the mobility of charge carriers, the light absorption coefficient, and quantum efficiency, while reducing the number of band gap sublevels that affect the dark current. This increases the photodetector sensitivity, decreases the magnitude of the dark current, and improves the signal power to noise power ratio at the output of the photodetector. Technologies for improving the properties of a material by improving the characteristics of bulk semiconductor crystals, multiple quantum wells, and superlattices are compared.
关键词： optoelectronics,photodetectors,quantum efficiency,isotopic nanoengineering,semiconductor materials
更新于2025-09-23 15:19:57
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Mechanism of Mn emission: Energy transfer vs charge transfer dynamics in Mn-doped quantum dots
摘要： In the quest for new functional materials, transition metal doping in semiconductors has attracted significant attention, wherein introduction of dopant atoms alters a range of physical properties of the host such as its optical, magnetic, and electronic properties. Hence, the choice of appropriate dopants to meet the current challenges makes semiconductor doping a highly versatile field. In the past, Mn doping in II-VI semiconductors has been extensively studied. The interest in these systems arises from a prominent orange emission from an optically forbidden state. An extended debate in the literature spanning the last three decades has so far shed light on various anomalous properties of Mn emission, specifically in quantum-confined systems leading to more questions. In this perspective, we review the literature with specific emphasis on the mechanism of Mn emission and an understanding of the electron–hole pathway during the excitation and de-excitation process in doped quantum dots. We explore various phenomena of energy and charge transfer mechanisms along with experiments in support of these phenomena which can eventually lead to a better understanding of spin driven optoelectronics.
关键词： Mn emission,optoelectronics,charge transfer,energy transfer,quantum dots
更新于2025-09-23 15:19:57
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Organic heterostructures composed of one- and two-dimensional polymorphs for photonic applications
摘要： Organic heterostructures (OHSs) consist of organic micro/nanocrystals are of essential importance for the construction of integrated optoelectronics in the future. However, the scarcity of materials and the problem of phase separation still hinder the fine synthesis of OHSs. Herein, based on the α phase one-dimensional (1D) microrods and the β phase 2D microplates of one organic compound 3,3′-((1E,1′E)-anthracene-9,10-diylbis(ethane-2,1-diyl))dibenzonitril (m-B2BCB), we facilely synthesized the OHSs composed of these two polymorph phases, whose growth mechanism is attributed to the low lattice mismatch rate of 5.8% between (001) plane of α phase (trunk) and (010) crystal plane of β phase (branch). Significantly, the multiport in/output channels can be achieved in the OHSs, which demonstrates the structure-dependent optical signals with the different output channels in the OHSs. Therefore, our experiment exhibits the great prospect of polymorphism in OHSs, which could provide further applications on multifunctional organic integrated photonics circuits.
关键词： heterostructure,integrated optoelectronics,fine synthesis,lattice mismatch,polymorph
更新于2025-09-23 15:19:57