单片集成MSM／HEMT长波长光接收机

本文介绍了利用ＩｎＧａＡｓ金属－半导体－金属（ＭＳＭ）长波长光探测器与ＩｎＡ１Ａｓ高电子迁移率晶体管（ＨＥＭＴ）单片集成来实现长波长光接收机的材料和电路设计、工艺途径等研究工作,基本解决了两种器件集成的工艺兼容性的问题,实现了１．３Ｇｂ／ｓ传输速率的单片集成长波长光接收机样品。     

Electrical characteristics and optoelectronic properties of metal--semiconductor--metal structure with zinc oxide nanowires across Au electrodes

This paper reports on a method of assembling semiconducting ZnO nanowires onto a pair of Au electrodes to construct a metal--semiconductor metal （MSM） structure by dieleetrophoresis and studying on its electrical characteristics by using current-voltage （Ⅰ - Ⅴ） measurements. An electronic model with two back to back Sehottky diodes in series with a semiconductor of nanowires was established to study the electrical transport of the MSM structures. By fitting the measured Ⅰ - Ⅴ characteristics using the proposed model, the parameters of the Schottky contacts and the resistance of nanowires could be acquired. The photoelectric properties of the MSM structures were also investigated by analysing the measurements of the electrical transports under various light intensities. The deduced results demonstrate that ZnO nanowires and their Schottky contacts with Au electrodes both contribute to photosensitivity and the MSM structures with ZnO nanowires are potentially applicable for photonic devices.     

Two-dimensional numerical computation of the structure-dependent spectral response in a 4H-SiC metal-semiconductor-metal ultraviolet photodetector with consideration of reflection and absorption on contact electrodes

A two-dimensional model of a 4H-SiC metal-semiconductor-metal(MSM) ultraviolet photodetector has been established using a self-consistent numerical calculation method.The structure-dependent spectral response of a 4H-SiC MSM detector is calculated by solving Poisson’s equation,the current continuity equation and the current density equation.The calculated results are verified with experimental data.With consideration of the reflection and absorption on the metal contacts,a detailed study involving various electrode heights(H),spacings (S) and widths(W) reveals conclusive results in device design.The mechanisms responsible for variations of responsivity with those parameters are analyzed.The findings show that responsivity is inversely proportional to electrode height and is enhanced with an increase of electrode spacing and width.In addition,the ultraviolet (UV)-to-visible rejection ratio is > 103.By optimizing the device structure at 10 V bias,a responsivity as high as 180.056 mA/W,a comparable quantum efficiency of 77.93%and a maximum UV-to-visible rejection ratio of 1875 are achieved with a detector size of H = 50 nm,S =9μm and W = 3μm.     

MSM结构平面及掩埋叉指电极间电场的分布特性

提出了一种新型具有掩埋电极的金属-半导体-金属(MSM)探测器原型器件结构,并用数值计算的方法研究了其激活层内电场的分布特性,讨论了掩埋电极深度对电场分布的影响,并与传统平面叉指电极结构进行比较,得出该结构对器件性能改善具有重要的作用.     

MSM结构ZnO/Cu薄膜的接触特性

利用脉冲激光沉积(PLD)法在Si(111)衬底上分别生长了ZnO薄膜和Cu薄膜, 用Cu薄膜作电极,研究了ZnO薄膜与Cu薄膜的接触特性。分别用X射线衍射仪、扫描电子显微镜和I-V测试的方法对样品的晶体质量、结构和电学性质进行了测试。结果表明:样品中ZnO薄膜和Cu薄膜均具有高度的择优取向;当Cu和 ZnO直接接触时,样品的I-V特性是非线性的;当Cu和 ZnO之间通过ZnO:Cu层间接接触时形成良好的欧姆接触,而且退火后欧姆接触性能明显提高,电阻率降低约2/3。本研究为价格低廉的Cu电极成为ZnO基器件的欧姆电极提供了一定的依据。     

SiO2纳米颗粒对a-AlGaN金属-半导体-金属结构紫外探测器的影响

采用对a-AlGaN表面沉积SiO₂纳米颗粒制备工艺得到了金属-半导体-金属(MSM)结构的a-AlGaN紫外探测器。与没有沉积SiO₂纳米颗粒的探测器件相比,沉积SiO₂纳米颗粒使器件的暗电流下降了一个数量级,峰值光谱响应度提高了近3个数量级,紫外/可见抑制比大于10³。     

A study of ultrasonic spray pyrolysis deposited rutile-TiO2-based metal-semiconductor-metal ultraviolet photodetector

This work uses ultrasonic spray pyrolysis deposition to grow the TiO₂ film on a Si substrate. The TiO₂ film was annealed at 800 °C for 2 h to form rutile phase. X-ray diffraction, Raman spectrum, X-ray photoelectron spectroscopy were used to characterized rutile phase TiO₂. The optical characteristics like refractive index, extinction coefficient and absorption coefficient were measured. The rutile TiO₂-based metal-semiconductor-metal ultraviolet photodetector was fabricated and investigated, including current-voltage characteristic, photoresponsivity, external quantum efficiency, response time, noise equivalent power, and detectivity.     

毕达哥拉斯群决策方法及其在绿色供应商选取中的应用

针对专家权重未知且属性值为毕达哥拉斯模糊数的多属性群决策问题,基于证据理论和混合加权毕达哥拉斯MSM算子,提出了一种群决策方法。 首先,由决策信息矩阵获取专家的模糊测度,并赋予其相应的权重;其次,基于新构造的混合加权毕达哥拉斯MSM算子对专家所提供的属性信息分别进行集结,得到各个专家的综合评价信息;再次,利用证据合成方法,对专家综合评价信息进行融合,获得候选方案的综合证据信息,进而可知备选方案的信任区间,并据此对候选方案进行优选决策;最后,绿色供应商选取案例的分析与对比验证了方法的可行性与合理性。     

调制解调器MSM6882及其在无线数据通信中的应用

MSM6882是日本OKI公司生产的、采用最小频移键控方法的数据调制解调器。该器件内含接收、发送和时钟产生电路，且数据传输波特率可在1200bps和2400bps中选择。文中介绍了MSM6882的主要性能和工作原理，给出了MSM6882在无线通信中的应用电路设计。     

光纤通信技术讲座--(七):光探测和光接收机

介绍光探测器基本原理、器件和数字光接收机构成、信噪比和性能.