What is difference among direct allowed, direct forbidden, indirect allowed and indirect forbidden gap in semiconductors?

More Dr.Abhay Dasadia's questions See All

How to confirm cation and anion in crystal structure using the data of CIF file?

I would like to learn the technique to index cations and anions of inorganic compounds from the CIF file obtained from single XRD characterization. Kindly suggest the method for this. Thank you...

09 October 2018 5,311 1 View

YBaCuO superconductor sample requirement in INDIA?

Kindly provide the contact who is synthesizing YBaCuO superconductor in bulk form....

02 March 2018 9,504 2 View

Band gap tuning?

What is actual meaning of band gap tuning in semiconductors? How is it possible using impurity?

11 December 2016 3,373 0 View

How to doped Chromium in ZnSe? If we want to grow Cr:ZnSe bulk crystal by vapor transport method then should we use Chromium powder or CrSe powder?

Its not clear about this question that how we can doped Cr in ZnSe by means of Chromium powder or CrSe powder. I want to grow Cr:ZnSe with various proportion of Cr in ZnSe to study the effect of...

03 April 2016 3,896 1 View

How to write proposal for post doc study?

I need the basic information to prepare proposal of post doc or research assistant...Which point should be incorporate in the proposal. Motivation letter are always the basic need of any position...

07 August 2015 7,366 1 View

Band structure determination is possible from CIF file?

Is it possible to calculate the band structure from data of single crystal XRD? Data is in the form of CIF file.

06 July 2014 9,271 5 View

Which journal is best for research pertaining to a new semiconducting materials in the form of single crystalline form?

.Nobody has reported this material yet. Kindly suggest options.

31 December 2013 8,143 4 View

How do I confirm cation and anion in the structure of crystals?

I want to know how to confirm the cation and anion of any crystalline material from CIF file? What is the key idea behind this analysis.

11 December 2013 1,554 5 View

Anisotropic behavior?

Generally it is said that crystalline materials are anisotropic but in crystalline materials, atomic arrangements are periodic in all three directions. So how can it behave anisotropic? If...

03 April 2013 5,539 6 View

Geotechnical Engineering (Proceedings of the ICE) time review?

Hello everyone, I recently submitted an article to Geotechnical Engineering (Proceedings of the ICE), and the current status has been listed as "EiC Pre-assessment: Ready" for the past 20 days. I...

10 August 2024 6,493 1 View

Are air moisture harvesting technologies effective in combating desertification?

Air moisture harvesting Air water collection devices

06 August 2024 5,473 2 View

Best mask design for metal deposition aiming build a Perovskite solar cell device?

What types of mask designs for metal deposition, to be used in a PVD system, are best suited for perovskite-based solar cells?

31 July 2024 4,835 3 View

¿Are oxygen vacancies in semiconductors capable to change the band gap?

Dear all! Oxygen vacancies do raise negatively the Fermi level by increasing the negative charge in the semiconductor crystal structure. In the case of n-type semiconductors, I wonder if this...

30 July 2024 8,339 2 View

How to build my own lab made four point probe set up?

Hello, I'm trying to measure the conductivity of semiconductor films but since I don't have a commercial four point probe set up I would like to build one on my own in my lab. I have generators,...

30 July 2024 906 2 View

What should a Mechanical Engineering PhD scholar focus on during their PhD to enhance their chances of securing a postdoctoral position?

29 July 2024 7,714 4 View

May I know the exact Quartile of the journal- Advanced Engineering Materials (Wiley) for material science category?

In some data sources it has been grouped in Q1 and some shows it is Q2.

29 July 2024 4,227 2 View

Ternary in Electrical Engineering?

Dear Research Community I would like to invite Elctrical Engineering specialists to solve problems related to Ternary Algebra or tripple sets I have an algorithm that places in relation three...

28 July 2024 5,771 2 View

What topic or subject does Production Engineering need to address more?

Contemporary scores or innovations in scientific approaches. Hybrid methodologies, emerging themes and cross-cutting issues?

27 July 2024 648 3 View

Reason for discontinuities in my Band structure?

Hey All! I am wondering what might be wrong with my band structure. I did the calculations using VASP and plotted the results using Origin. Although I have tried changing various input...

25 July 2024 2,920 11 View

Soong Leong Sim

but i dont understand how this is related to the Tauc's plot.

Mohammed RASHEED

By using Tauc relation, and for a thin film like ZnO, if we can find the four types of optical transitions for example allowed and forbidden direct and indirect where m=0.5, 3/2, 2 and 3 respectively; how can one recognize and prove which one of them is better with our thin film?