The Van Der Pauw Method of Measuring Hall Effect to Determine Mobility, Carrier Type & Concentration

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Күн бұрын

In this Lake Shore Academy: "How Does it Work?" video, we discuss the Hall effect and explore the procedure of conducting Van der Pauw method Hall effect measurements on a semiconductor material.
With an accurate measurement of the material resistivity and Hall effect, we are then able to calculate derived parameters such as carrier type (p-type or n-type), carrier concentration or carrier density, and mobility. These are the characteristics of most interest to the researcher trying to determine a material's suitability as a semiconductor.
As a compliment to this video, Lake Shore has developed the Hall Effect Measurement Handbook. This guide, written by Lake Shore Senior Scientist Dr. Jeffrey Lindemuth, reviews methods to measure the resistivity of materials, then discusses the theory of Hall measurements in addition to Hall bar sample geometry, Van der Pauw method and 4 point probes.
Resources:
► Hall Effect Measurement Handbook: hubs.li/Q02GRsbw0
#HallEffect
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Lake Shore Cryotronics website: www.lakeshore.com/
Lake Shore Cryotronics on LinkedIn: / mycompany

Пікірлер: 34

@yryu2 4 жыл бұрын

Thank you for your video, it was very helpful. Can you give me recommended science articles and/ or books that you have read to make this youtube video, please. It is for my own private research.

@LakeshoreCryo 4 жыл бұрын

I'm very glad it was helpful for you! Lake Shore's marketing department worked with the application scientist Jeff Lindemuth to create this video. As a compliment to this video we have developed the Hall Effect Measurement Handbook which really digs deep into measuring the Hall effect. If you found this video to be interesting and helpful, you definitely should download our Hall Effect Measurement Handbook! tinyurl.com/y87gzys2

@yryu2 4 жыл бұрын

@@LakeshoreCryo I have downloaded it now. Thank you very much.

@AtlanticSailorLP 3 жыл бұрын

In the equation for Hall Coefficient you need the thickness of the sample as well.

@ibtissammohlane7878 3 жыл бұрын

thank you for this video the animation helps a lot to understand this complicated method of vander paw. make more video....

@Fisherdec 4 ай бұрын

incredible video. Just dont forget to multiply by thickness for hall coefficient

@salilakumarsethy6254 3 жыл бұрын

Thank you sir, For very much informative video

@methaniwissem9035 3 жыл бұрын

Very informative video, I also downloaded the book and I'm using it as a guide for my experiments!

@LakeshoreCryo 3 жыл бұрын

That's excellent! Very happy to hear the documents we've created are being used in the field.

@arthiitb Жыл бұрын

Thanks a lot for making this video. ❤️✌️

@shepherdlavellen3301 4 жыл бұрын

can't imagine such a helpful video received so few views

@LakeshoreCryo 4 жыл бұрын

Thank you Sheperd! It's slowly receiving more views every day. For only being live less than a year, it's being viewed quite often. The good news is the information will always be helpful and the video will always be here for those that need to refer to it!

@yashpandey8021 4 жыл бұрын

Thank you so much sir. I really appreciate your work.

@LakeshoreCryo 4 жыл бұрын

Thanks Yash! Glad you're enjoying the video.

@varunsharma-zr1ws 2 жыл бұрын

Vary clear and concise ....thanks....

@soup6941 3 жыл бұрын

good video to learn

@anyfincanhappen 3 жыл бұрын

Thank you for your video. Can I ask a question about calculate mobility and current density ? I measure hall effect about (Rxx or Rxy) - B curve . Someone will use the slope to calculate them . But ,I don't know how to prove the formula.

@magalhaes753951 3 жыл бұрын

You use the absolute values of current and voltage, or do you need to pay attention to the signal of both measures?

@10_jillrsaliya10 3 жыл бұрын

thnx for this video u explained this topic within 10min And our professor cant do same in 2hr lecture

@LakeshoreCryo 3 жыл бұрын

Haha....great comment! Our goal is to make the complicated more easily understood. We're glad the video was helpful!

@lishint8017 3 жыл бұрын

Thank u sir

@MinhTruong1093 4 жыл бұрын

Thank you very much for the video. What does "f" in Van Der Pauw's Equation for Resistivity refer to?

@LakeshoreCryo 4 жыл бұрын

Good question Minh, and this information may need added to the video for further clarity. "f" refers to the symmetry of the sample. After speaking with our Hall expert, his explanation is as follows: "f" is determined by using Van der Pauw's equation for calculating "f". If f=1 the sample is symmetric; values less than 1 mean the sample is less symmetric. Please see the linked image: imgur.com/bGdF8Ik Hopefully that helps. If not, let us know and we'll provide further detail.

@MinhTruong1093 4 жыл бұрын

@@LakeshoreCryo Thank you very much for your answer. So does that mean f = 1 for Van Der Pauw’s geometric configuration (square) ?

@LakeshoreCryo 4 жыл бұрын

@@MinhTruong1093 Yes for a perfect square with contacts all the same size, shape and placement, f would = 1.

@MinhTruong1093 4 жыл бұрын

Thank you very much for your answer!

@flixerstudios1862 2 жыл бұрын

Why are differences in these measurements taken into the resistance calculation? When I do this I get totally different answers compared by plugging in voltages/currents one by one and then averaging.

@ozgurcan4929 3 жыл бұрын

What must be the polarity for the voltmeter?

@LakeshoreCryo Жыл бұрын

If the polarity of the voltmeter is backwards, then a positive current will make a negative voltage, and the resistance will be negative. The polarity of the voltmeter should always be set correctly so that resistance are calculated as positive.