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Silicon nanocrystal hybrid photovoltaic devices for indoor light energy harvesting
摘要： Silicon nanocrystals (SiNCs) featuring size-dependent novel optical and electrical properties have been widely employed for various functional devices. We have demonstrated SiNC-based hybrid photovoltaics (SiNC-HPVs) and proposed several approaches for performance promotion. Recently, owing to the superiorities such as low power operation, high portability, and designability, organic photovoltaics (OPVs) have been extensively studied for their potential indoor applications as power sources. SiNCs exhibit strong light absorption below 450 nm, which is capable of sufficient photocurrent generation under UV irradiation. Therefore, SiNC-HPVs are expected to be preferably used for energy harvesting systems in indoor applications because an indoor light source consists of a shorter wavelength component below 500 nm than solar light. We successfully demonstrated SiNC-HPVs with a PCE as high as 9.7%, corresponding to the output power density of 34.0 mW cm?2 under standard indoor light irradiation (1000 lx). In addition, we have found that SiNC defects working as electron traps influence the electrical properties of SiNCs substantially, a thermal annealing process was conducted towards the suppression of defects and the improvement of the SiNC-HPVs performance.
关键词： Silicon nanocrystals,Power conversion efficiency,Indoor light energy harvesting,Thermal annealing,Hybrid photovoltaics
更新于2025-09-23 15:21:01
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Coupling a silicon-on-insulator waveguide to a metala??dielectrica??metal plasmonic waveguide through a vertical and lateral taper-funnel structure
摘要： Designing efficient and compact couplers is crucial in hybrid integration of plasmonic components with conventional silicon-on-insulator components. Taper-funnel structures are conventionally used to couple light from a silicon strip waveguide to a metal–dielectric–metal plasmonic waveguide. In this paper, we investigate the effect of different parameters of the metallic funnel and the vertically and laterally tapered silicon waveguide on the performance of the designed coupler. Numerical simulations indicate that the tuned coupler has an average coupling efficiency of 87% in the C-band. The designed 1.18-μm-long coupler has a shorter length compared to the previous designs, while its theoretical coupling efficiency is higher than 85% in the entire O, E, S, C, L, and U bands of optical communication.
关键词： silicon-on-insulator,plasmonic waveguide,taper-funnel structure,coupling efficiency
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) - On the impact of the metal work function on the recombination in passivating contacts using quasi-steady-state photoluminescence
摘要： Understanding the impact of metal contacts on the recombination within a passivated silicon wafer is crucial for the optimization of various photovoltaic devices such as passivating-contact-based solar cells. To investigate the effect of the metal work function, a selection of metals is applied to aluminum-oxide-passivated n-type crystalline silicon wafers. The saturation current density of the metalized contact (J0m) is determined using the quasi-steady-state photoluminescence method and used as a figure of merit to quantify the effect. We find that J0m increases with the metal work function and that this effect is modulated with the passivation layer thickness. It is more pronounced for thinner passivation layers, which can be attributed to a significant change in the populations of electrons and holes near the silicon surface induced by the metal. Meanwhile thicker layers prevent the charge transfer between the silicon and metal more efficiently leading to insignificant changes in J0m. Based on these findings, we suggest a suitable metal work function range to optimize contact recombination in silicon-based solar cells.
关键词： passivating contacts,surface recombination,saturation current density,quasi-steady-state photoluminescence,work function,Effective lifetime,silicon solar cells
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) - Powerful topographic analyzing technique using Fast Fourier Transform for c-Si solar cells and emerging technologies
摘要： Light management of a solar cell can be enhanced by improving Jsc with proper texturing. Topographic images obtained by confocal laser microscopy or AFM are used to study the roughness of textured surfaces. Fast Fourier Transform is employed to separate and select spatial frequencies, which will be analyzed through MountainsMap?. Various kind of samples can be studied such as textured c-Si solar cells or even tandem devices made of perovskite grains evaporated on Si pyramids. The structural, morphological and geometrical results can be extracted in a fast, automatic and repeatable way with a good throughput to enable statistical analysis.
关键词： spatial frequencies,FFT,roughness,silicon
更新于2025-09-23 15:21:01
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Transparent Electrodes Consisting of a Surface-Treated Buffer Layer Based on Tungsten Oxide for Semitransparent Perovskite Solar Cells and Four-Terminal Tandem Applications
摘要： For semitransparent devices with n-i-p structures, a metal oxide buffer material is commonly used to protect the organic hole transporting layer from damage due to sputtering of the transparent conducting oxide. Here, a surface treatment approach is addressed for tungsten oxide-based transparent electrodes through slight modification of the tungsten oxide surface with niobium oxide. Incorporation of this transparent electrode technique to the protective buffer layer significantly recovers the fill factor from 70.4% to 80.3%, approaching fill factor values of conventional opaque devices, which results in power conversion efficiencies over 18% for the semitransparent perovskite solar cells. Application of this approach to a four-terminal tandem configuration with a silicon bottom cell is demonstrated.
关键词： semitransparent solar cells,perovskite-silicon tandem,niobium oxide,tungsten oxide,perovskite solar cells
更新于2025-09-23 15:21:01
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Colloidal Quantum-Dots/Graphene/Silicon Dual-Channel Detection of Visible Light and Short-Wave Infrared
摘要： Integration of infrared detectors with current silicon-based imagers would not only extend their spectral sensing range but also enables numerous applications including thermal imaging, machine vision, and spectrometers. Here, we report the development of a dual-channel photodetector by depositing a colloidal quantum dot (CQDs) infrared photodiode onto a graphene/p-Silicon Schottky diode to provide simultaneous visible and infrared photoresponse channels. The HgTe photodiode is patterned into a semitransparent mesh-structure so that the visible light reaches the Silicon substrate with varying fill factors. The graphene/silicon Schottky junction has a responsivity of ~0.9 A/W in the visible and the infrared CQDs photodiode has a detectivity of ~5×109 Jones at 2.4μm, for a filling factor of 0.1.
关键词： Photodetectors,Graphene/silicon Schottky junction,Visible/infrared,Colloidal quantum dots
更新于2025-09-23 15:21:01
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[IEEE 2019 14th International Conference on Computer Engineering and Systems (ICCES) - Cairo, Egypt (2019.12.17-2019.12.17)] 2019 14th International Conference on Computer Engineering and Systems (ICCES) - Silicon photonic coupled-ring resonator in nested configuration comprising different length scales
摘要： Silicon photonics is continuing to develop for an increasing number of applications including data centers, miniaturized sensors and atomic clocks. The development involved the creation of the technology platform, design of innovative devices and developing models and methods for fabrication tolerance assessment. In our work, we suggest a novel structure for silicon photonic coupled-ring-resonator with an order of scale difference in the rings’ lengths and sensitivity analysis for this structure. The design consists of a long racetrack resonator of length 472.6 μm (sub-millimeter scale) nested by ring resonator of radius 25 μm. This radius was chosen to minimize bending losses. The coupling ratio of the directional couplers is designed to be 97/3. The suggested structure is fabricated by the IMEC fabrication facility which is using DUV lithography and silicon etching ePIXfab. The analysis shows that this structure can achieve higher finesse than the typical values of the conventional structure, even with reasonable fabrication tolerance. Experimentally a finesse of about 25 and a quality factor of about 17,000 is achieved. The proposed structure can improve the performance of optical sensing and filtering.
关键词： integrated sensors,silicon photonics,fabrication tolerance,finesse enhancement,nested filters,ring resonator
更新于2025-09-23 15:21:01
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[IEEE 2019 24th Microoptics Conference (MOC) - Toyama, Japan (2019.11.17-2019.11.20)] 2019 24th Microoptics Conference (MOC) - Light-Induced Self-Written Optical Waveguide Fabrication by Near Infrared Continuous Wave Laser Light with Microwatt Power
摘要： We have successfully demonstrated light-induced self-written (LISW) waveguides at a wavelength of 1070 nm and 1310 nm, respectively. Microwatt level photopolymerization threshold value was obtained at both wavelengths. The results show a promising approach for optical interconnection in silicon photonics.
关键词： Photopolymerization,Continuous Wave (CW) laser,Silicon photonics,Near Infrared (NIR),Light-induced self-written (LISW) waveguides
更新于2025-09-23 15:21:01
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[IEEE 2020 IEEE 20th Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems (SiRF) - San Antonio, TX, USA (2020.1.26-2020.1.29)] 2020 IEEE 20th Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems (SiRF) - Progress Towards Fully On-Chip Frequency-Stabilization for Sub-Terahertz Sources
摘要： Resonators fabricated in heavily doped silicon have been noted to have a reduced frequency-temperature dependence compared with lightly doped silicon. The resonant frequency of silicon microelectromechanical systems (MEMS) resonators is largely governed by the material’s elastic properties, which are known to depend on doping. In this paper, a suite of different types and orientations of resonators were used to extract the ?rst- and second-order temperature dependences of the elastic constants of p-doped silicon up to 1.7e20 cm?3 and n-doped up to 6.6e19 cm?3. It is shown that these temperature-dependent elastic constants may be used in ?nite element analysis to predict the frequency-temperature dependence of similarly doped silicon resonators.
关键词： temperature dependence,Doping,resonators,silicon
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) - Simulation of Optical and Electrical Losses of PV Modules in Moderate and Desert Conditions
摘要： Measurements of the PV modules are based on standard test conditions. However, PV modules have significant difference in performance based on the locations, environmental conditions and mounting situation. One of the environmental factors which influence the performance of the PV module is the spectrum of incident light on the PV module. In this paper, we compare the optical reflection losses, thermal losses as well as electricity production of modules under moderate (AM1.5) and desert-like spectrums (AM1.0). The results show quantitatively that thermalization has the highest loss portion with an average of 29.5% of the total incoming power density for both spectrums. The highest relative change is for absorption of light in polymer encapsulant especially between 280-400 nm with 24.3% and total resistive losses (in cell and interconnection) with 21.3% extra losses from desert to moderate conditions. Finally, we show that similar modules in desert climate produce 5% extra power gain while it suffers from 7.2% extra heat and 5% extra reflections.
关键词： Photovoltaic cells,Si PV Modelling,Metrology and Characterization,PV,Crystalline Silicon PV
更新于2025-09-23 15:21:01