Abstract:
Deformable optoelectronic devices are provided, including photodetectors, photodiodes, and photovoltaic cells. The devices can be made on a variety of paper substrates, and can include a plurality of fold segments in the paper substrate creating a deformable pattern. Thin electrode layers and semiconductor nanowire layers can be attached to the substrate, creating the optoelectronic device. The devices can be highly deformable, e.g. capable of undergoing strains of 500% or more, bending angles of 25° or more, and/or twist angles of 270° or more. Methods of making the deformable optoelectronic devices and methods of using, e.g. as a photodetector, are also provided.
Abstract:
The generation of photocurrent in an ideal two-dimensional Dirac spectrum is symmetry forbidden. In sharp contrast, a three-dimensional Weyl semimetal can generically support significant photocurrent due to the combination of inversion symmetry breaking and finite tilts of the Weyl spectrum. To realize this photocurrent, a noncentrosymmetric Weyl semimetal is coupled to a pair of electrodes and illuminated with circularly polarized light without any voltage applied to the Weyl semimetal. The wavelength of the incident light can range over tens of microns and can be adjusted by doping the Weyl semimetal to change its chemical potential.
Abstract:
A detector for detecting single photons of infrared radiation. A waveguide configured to transmit infrared radiation is arranged to be adjacent a graphene sheet and configured so that evanescent waves from the waveguide overlap the graphene sheet. An infrared photon absorbed by the graphene sheet from the evanescent waves heats the graphene sheet. The graphene sheet is coupled to the weak link of a Josephson junction, and a constant bias current is driven through the Josephson junction, so that an increase in the temperature of the graphene sheet results in a decrease in the critical current of the Josephson junction and a voltage pulse in the voltage across the Josephson junction. The voltage pulse is detected by the pulse detector.
Abstract:
An integrated, superconducting imaging sensor may be formed from a single, meandering nanowire. The sensor is capable of single-photon (or single-event) detection and imaging with -10 micron spatial resolution and sub-lOO-picosecond temporal resolution. The sensor may be readily scaled to large areas.
Abstract:
A semiconductor device includes a silicon substrate and a detection element and p-type and n-type MOS transistors, which are arranged on the silicon substrate, wherein the detection element includes a semiconductor layer, electrodes, and a Schottkey barrier disposed therebetween, the semiconductor layer is arranged just above a layer having the same composition and height as those of an impurity diffusion layer in the source or drain of the p-type or n-type MOS transistor, a region, in the silicon substrate, having the same composition and height as those of a channel region, in the silicon substrate, just below a gate oxide film of the p-type MOS transistor or the n-type MOS transistor, or a region, in the silicon substrate, having the same composition and height as those of a region just below a field oxide film disposed between the p-type and the n-type MOS transistor.
Abstract:
Es wird eine Schaltungsanordnung zum Einstellen eines Ausgangspotentials am HF-Ausgang eines pin-Photoempfängers, der sich in Gleichspannungskopplung mit einem nachfolgenden Elektronikschaltkreis befindet, auf ein bestimmtes Potential vorgeschlagen. Dabei ist an den pin- Photoempfänger eine über einen ohmschen Abschlusswiderstand das Ausgangspotential beeinflussende Versorgungs Spannung anlegbar. Die Schaltungsanordnung umfasst eine Regelschleife zum Erzeugen und Regeln der Spannung der Spannungsversorgung, die einen Ausgangsanschluss aufweist, wobei die Regel -schleife einen ohmschen Nachbildungswiderstand, der an den ohmschen Abschlusswiderstand angeglichen ist, und Mittel zur Messung einer Spannungsdifferenz über den Nachbildungswiders tand und zum Reproduzieren der Spannungsdifferenz als Spannungspotential an den Ausgangsanschluss der Regelschleife aufweist. Weiterhin betrifft die Erfindung eine Photoempfängeranordnung mit einem pin-Photoempfänger mit mindestens einer Photodiode und der erfindungsgemäßen Schaltungsanordnung zum Einstellen des Ausgangspotentials am HF-Ausgang des Photoempfängers.
Abstract:
자외선 센서는 압전 물질; 압전 물질 상에 배치되고 자외선을 감지하는 감지막; 압전 물질 상에서 감지막의 일단에 배치되고 전기적 신호를 기초로 생성된 탄성파를 감지막에 제공하는 탄성파 입력부; 및 압전 물질 상에서 감지막의 다른 일단에 배치되고 제공된 탄성파를 기초로 생성된 전기적 신호의 주파수의 변화를 감지하는 탄성파 출력부를 포함한다. 따라서, 자외선 센서는 파티클 자체의 특성상 표면적이 넓어 더 많은 자외선에 반응할 수 있으므로 센서의 감도를 향상시킬 수 있고, 산화아연(ZnO) 나노파티클을 사용하여 탄성파의 주파수 변화를 측정하기 때문에 가격 경쟁력을 확보할 수 있다.
Abstract:
Utilizing a quench time to deionize an ultraviolet (UV) sensor tube are described herein. One method includes monitoring firing events within a UV sensor tube, where a particular firing event initiates arming the UV sensor tube, initiating a quench time to deionize the UV sensor tube, where the quench time includes, disarming the UV sensor tube to prevent a firing event.
Abstract:
The invention relates to radiation detection with a directly converting semiconductor layer for converting an incident radiation into electrical signals. Sub-band infra-red (IR) irradiation considerably reduces polarization in the directly converting semiconductor material when irradiated, so that counting is possible at higher tube currents without any baseline shift. An IR irradiation device is integrated into the readout circuit to which the crystal is flip-chip bonded in order to enable 4-side-buttable crystals.