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Place cells are neurons in the hippocampus that are sensitive to location within an environment. Simulations of a large-scale, computational model of the rat dentate gyrus using grid cell input have been performed resulting in granule cells that express multiple place fields. The typical method of detecting place fields using a global threshold on this data is unreliable as the characteristics of...
We propose a new, optically coupled tandem architecture with a silicon “PVMirror” as the bottom cell. A silicon PVMirror is a curved silicon module with an integrated dichroic mirror that transmits near-infrared light to the silicon cells and reflects and focuses visible light onto a GaAs receiver. Simulating such a system with record GaAs and silicon cells and an ideal dichroic mirror shows the tandem...
Single-junction solar cells are approaching their theoretical efficiency limit, and tandem or multi-junction architectures provide a route for further increasing efficiency. However, due to high material cost, these technologies have traditionally been restricted to high concentrations with the penalty of the loss of diffuse light in outdoor applications. We propose a new tandem concept called a “PVMirror”...
In this paper, the reliable SiNx/AlGaN/GaN MISHEMTs on silicon substrate with improved trap-related characteristics have been well demonstrated. The devices with our proposed treatment method showed less deep-level traps and more Si surface donors at SiNx-AlGaN interface. The trap related device characteristics are also improved by using our optimized treatment method. The devices with proposed treatment...
In this work, we investigate the static and dynamic gas response of Schottky diode based hydrogen sensor employing a Pt/WO3/n-type Si configuration. The role and importance of tungsten trioxide as an insulating layer within the device is discussed with respect to the measured electronic properties. The WO3 thin films were deposited using RF reactive magnetron sputtering. The surface morphology was...
We demonstrate that vertical silicon nanowires function as photodetectors whose spectral sensitivities are controlled by choice of nanowire radius. The measured external quantum efficiencies of fabricated devices are compared to electromagnetic simulations.
We report on n-channel tunneling field-effect transistors (TFET) with a tensile strained Si channel and a compressively strained Si0.5Ge0.5 source. The device shows good performance with an average subthreshold swing S of 80mV/dec over a drain current range of more than 3 orders of magnitude. We observed that an applied back-gate bias increases the on-current by a factor of 1.6, and improves the off-current...
A new MIS Schottky-diode hydrogen sensor with La2O3 as gate insulator was fabricated. Its hydrogen-sensing properties were studied from room temperature (RT) to 300°C. Results showed that the device had excellent hydrogen-sensing performance below about 250°C.
Solar cells consisting of extremely uniform and ordered large-area arrays of silicon micropillars are fabricated using metal-assisted chemical etching. Micropillar diameter, pitch, height, and core-shell doping profiles are optimized for light trapping and carrier collection.
In this paper, we present gas sensing properties of Pt/graphene-like nano-sheets towards hydrogen gas. The graphene-like nano-sheets were produced via the reduction of spray-coated graphite oxide deposited on SiC substrates by hydrazine vapor. Structural and morphological characterizations of the graphene sheets were analyzed by scanning electron and atomic force microscopy. Current-voltage and dynamic...
Thin film edge emitting lasers with top/bottom stripes are broad area metal/metal bonded to a Si substrate. The bonding and top/bottom stripes are steps forward toward better heat dissipation, current confinement, and mechanical bonding strength.
The nonlinear refractive index of Silicon nanocrystals was measured by the z-scan technique. The results were used to estimate the magnitude of the self-phase modulation (SPM) effect in slot waveguide structures filled by Silicon nanocrystals.
Integration of photonic active and passive components - and ultimately, full systems - directly onto Si and Si CMOS are a critical step toward chip scale photonic system integration. Thin film compound semiconductor lasers heterogeneously integrated onto silicon open up a wide range of applications, including portable sensing systems, optical interconnects, and chip scale ultrafast optical signal...
A systematic study of silicon nanocrystals (Si-ncs) nonlinearities at 1550 nm was carried out in view of the realization of an all optical Mach-Zehender interferometer (MZI).
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