Micro-four-point probe Hall effect measurement method

طراحی و ساخت دستگاه four-point probe station

یکی از ویژگی های اساسی مواد هادی مقاومت الکتریکی آن هاست که با داشتن تعداد الکترونهای آزاد لایه ظرفیت می توان مقاومت الکتریکی آن ماده را پیدا نمود. با اندازه گیری مقاومت الکتریکی مواد می توان ویژگیها و مشخصات ماده را تعیین نمود. در این پایان نامه بنا داریم به اندازه گیری مقاومت الکتریکی با استفاده چهار پراب همراستا با فاصله ثابت از هم که در تماس با سطح یک ویفر سیلیکونی هستند اقدام کنیم. در عم...

Direct measurement of surface-state conductance by microscopic four-point probe method

For in situ measurements of local electrical conductivity of well defined crystal surfaces in ultrahigh vacuum, we have developed microscopic four-point probes with a probe spacing of several micrometres, installed in a scanningelectron-microscope/electron-diffraction chamber. The probe is precisely positioned on targeted areas of the sample surface by using piezoactuators. This apparatus enabl...

Mesoscopic current transport in two-dimensional materials with grain boundaries: Four-point probe resistance and Hall effect

Anisotropy in conductance of a quasi-one-dimensional metallic surface state measured by a square micro-four-point probe method.

We have devised a "square micro-four-point probe method" using an independently driven ultrahigh-vacuum four-tip scanning tunneling microscope, and succeeded for the first time to directly measure anisotropic electrical conductance of a single-atomic layer on a solid surface. A quasi-one-dimensional metal of a single-domain Si(111)4 x 1-In had a surface-state conductance along the metallic atom...

Open-Source Automated Mapping Four-Point Probe

Scientists have begun using self-replicating rapid prototyper (RepRap) 3-D printers to manufacture open source digital designs of scientific equipment. This approach is refined here to develop a novel instrument capable of performing automated large-area four-point probe measurements. The designs for conversion of a RepRap 3-D printer to a 2-D open source four-point probe (OS4PP) measurement de...