How to know a material has either direct or indirect bandgap energy

How to know a material has either direct or indirect bandgap energy - 18

Рет қаралды 56,283

4 жыл бұрын

You must watch these 2 videos before watching this video.
1. How to calculate bandgap energy from absorption data using the Tauc plot method
• Band gap energy from a...
2. Tauc Plot? 2.303 constant? 1240 constant?
• Band gap energy (Tauc ...
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Understanding the bandgap structure and correct nature of the electronic transition between the valence band and the conduction is very important for those scientists and researchers who are working on optoelectronics devices. In this video, I have shown a simple approach to properly understand the bandgap nature of any material using the Tauc plot method through OriginLab software. After watching this video, you will be able to determine the material has direct or indirect bandgap energy.
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Пікірлер: 66

@najeebullahkust2708 3 жыл бұрын

well done bro u have solved my big problem. Really nice explain.

@notconfirm4492 3 жыл бұрын

Amazing sir learn lots of thing from this video. Even now i dont need to discuss with this thing with ny supervisor. Great job highly appreciated

@nanoworld6122 3 жыл бұрын

Glad it was helpful!

@dr.govardhanababubodedla1208 3 жыл бұрын

Very informative video and nice BGM. Keep it up and make more videos.

@lincolnfsouza 4 жыл бұрын

Thanks for all help. i really appreciate your videos. There is a way to obtain data on the chemical states of the elements in a semiconductor or a nanoparticulate composite by origin?

@user-jj4ms4uz1k 3 жыл бұрын

If I want get absorbance as a function of wavelength. For preparing the samples, what is the suitable thickness of Tio2, MnO2, SiN or a-Si ... they should be thicker than a certain amount?

@banda9518 3 жыл бұрын

Thankyou so much for the video!! fastastic. is there other methods to confirm about the band gap of the compound? if so please highlight. thankyou in advance

@abdullahikilacousman1749 4 жыл бұрын

Thanks for sharing, how can i get the UV Absorbance/Wavelength data of TiO2 or TiO2/ZnO hybrid nanoparticle, can i just dissolve/disperse it in water and scan using the UV or i have to make a Solid Sample, Thank you

@user-rc1ft1oj6h 3 жыл бұрын

Thanks for wonderful explanation Please how I calculate absorbance coefficient if I used solution samples to testing UV-visible absorbance?????

@aiminabila6406 Жыл бұрын

hello. for the indirect part, the starting point of y axis is not equals to 0. but for the direct part, you mentioned in the video we need to always keep the starting point of y axis zero. so is the starting point 0 matter for the indirect part?

@fizikchy 10 ай бұрын

Good job. But Origin already has a great built-in fitting tool. Yes, it does not give x-intercept directly. But for this purpose one can create his/her own linear fit function by adding x-intercept as DERIVED PARAMETER. In linear fitting, the curve is y=ax+b, then associated bandgap is x-intercept: E_g=-b/a.

@zahidurrahaman428 4 жыл бұрын

Very helpful. Thank you. Keep up the good work.

@nanoworld6122 4 жыл бұрын

Glad it was helpful!

@dr.abdelmounaimchetoui 10 ай бұрын

Thank you for the effort but i 'd like to draw your attention to the fact that the Taux plot of certain materials could present the linear part and the y-axis strats from "0" for both direct and indirect transitions. What would you pick in this situation ?!

@achmadnasyori8667 3 жыл бұрын

Hay sir, many thanks for your video. My sample is liquid, do yo know how to get the thickness ?

@nabihahkasim2097 3 жыл бұрын

Hi. I have a question. Can a material have both direct and indirect bandgap? Is it possible let's say the nature of the material is direct but the indirect comes from defects? TIA!

@callbikram 2 жыл бұрын

Very nicely done

@aunimardhiah4767 2 жыл бұрын

in which calculation should i put my smoke thickness?

@prasannahemz 4 жыл бұрын

Consice and clear explanation sir, thanks for the video

@nanoworld6122 4 жыл бұрын

Glad you liked it

@SujoyShivde 2 жыл бұрын

Nice and helpful.

@prasannadevic4376 2 жыл бұрын

Sir put up the video Vickers microhardness testing.how I calculated work hardening coefficient or Meyer index value

@kavitayadav8351 3 жыл бұрын

How to draw tauc plote for thin film

@thaislima6895 Жыл бұрын

excellent video

@dauz889 5 ай бұрын

The energy gap of 3.2 eV for TiO2 suggests the presence of Anatase wich has indirect band gap while Rutile with Eg=3.0 eV can have direct band gap alignment. I expect some dopants can modify the band alignment of Anatase otherwise i don't understand the results. Any help on clarifying this issue?

@mark69064 2 жыл бұрын

I wonder why it can identify the direct or indirect bandgap just from the n value, what's the theory behind it? and sometimes, I can see straight line part both from n=2 and 1/2, confuse me:D

@mmbytes1911 Жыл бұрын

how to calculate the absorption coefficient(m^-1) and refractive index spectrum from the absorbance (au) spectrum.

@majidraza346 Ай бұрын

Thanks a lot sir

@duhasaadi350 2 жыл бұрын

many thanks

@calypso4124 Жыл бұрын

THANK YOU VERY WELL

@charmipatel1381 5 ай бұрын

I wanted to aske that first we need to put both value in tauc"s formula and then find out from nature of graph that our material has either direct or indirect BAND GAP? BTW your tutorial are useful for my research work. Thank you

@saraj1159 3 жыл бұрын

hi, thanks so much for the videos, does the concentration effect on the calculation and the bandgap values? Mnay thanks

@nanoworld6122 3 жыл бұрын

Yes they do, only If the concentration is too low or too high. In these causes, the material will not obey the Beer lambert's law and as a result will give you wrong value of the bandgap energy.

@snehareddy4826 2 жыл бұрын

Hello, thanks for an informative video. Can you also explain how can we measure the energy band gap from the specular reflectance data collected from UV-VIS? I have a formula alpha = (1-R)^2/(2R). Using the reflectance data, we can calculate alpha without the need of thickness and plot (alpha h v)^2 vs (hv). This is basically for the diffuse reflectance data but I am not sure if it is applicable for specular reflectance. Also, From the tauc plot (alpha h v)2 vs (hv), how can we measure the energy band gap if we have multiple peaks? I mean it’s difficult to choose a point to extrapolate if we have multiple peaks. So, how can we decide?

@snehareddy4826 2 жыл бұрын

Please respond

@velkrishnaveni2379 3 жыл бұрын

How can we find out the nature of metal ion, the oxidation state of the metal ion, and its coordination? Please help me to know that

@aliciatripp8020 3 жыл бұрын

X-ray absorption near-edge structure (XANES) from an X-ray absorption spectrum can tell you this by looking at the pre-edge peak position and intensity. X-ray photoelectron spectroscopy (XPS) can also tell you oxidation state of all elements present on the surface of your material.

@zainabzareen2056 3 жыл бұрын

Very nice video

@nanoworld6122 3 жыл бұрын

Thanks

@attaralaaeddine6532 3 жыл бұрын

thank you bro

@nanoworld6122 3 жыл бұрын

Welcome

@fatimaejazbajwa2942 Жыл бұрын

Sir I have a question, for thin films solar cells is increasing badgap good or decreasing?

@saifullahaslam9314 11 ай бұрын

it is good for solar cells having increased band gap because it allows more absorption of charges while in batteries low band gap materials are preferable

@varunkumarsinghal5642 3 жыл бұрын

Good Informative video...this is really helpful for me. can you tell me how you add the "F(x)=" in you origin?

@nanoworld6122 3 жыл бұрын

This option is visible in all the latest versions of OriginLab including 9.0 and above. However, in versions below 9.0, you can access this option by clicking on any column and then goes to Input column values option

@varunkumarsinghal5642 3 жыл бұрын

@@nanoworld6122 I am doing exactly what you said bt. i want it to be visible in front also. I am using OriginPro 9.0.0 SR2

@nanoworld6122 3 жыл бұрын

sorry, I don't know about SR2 version.

@gulzarlone93 3 жыл бұрын

THNKU SIR

@nanoworld6122 3 жыл бұрын

You are welcome

@user-xn7nt2li9n 4 жыл бұрын

tthank you

@nanoworld6122 4 жыл бұрын

You're welcome

@xrdcemnat4744 2 жыл бұрын

Hi! You did a mistake in the lecture. n = 1/2 for direct allowed transitions and n = 2 for indirect allowed transitions. In the video, you wrote it vice versa.

@xrdcemnat4744 2 жыл бұрын

Sorry. it is my mistake). You wrote n, not 1/n)