Bibek S Dhami

12 Questions 15 Answers 0 Followers

Questions related from Bibek S Dhami

Why the exciton binding energy in methyl ammonium lead bromide perovskite is more compared to iodide perovskite?

The exciton binding energy in methyl ammonium lead bromide is reported to be around 40 meV but for iodide, it is even less than room temperature energy. As a result of this, the charge carriers...

08 August 2022 938 1 View

How to measure the relative quenching efficiency in steady state surface quenching technique for the determination of exciton diffusion length?

I was looking for the techniques to measure exciton diffusion length. Several techniques are reported. In the steady-state and time-resolved surface quenching techniques, people use a simple...

28 January 2022 2,490 0 View

What is the active layer in LED?

In the structure of light-emitting diode construction, people talk about the active region in between p and n-type semiconductors. Why do we require that active region? Is that active region just...

25 May 2021 3,740 4 View

What are E1^2g and A1g Raman modes in MoS2?

Can someone please help me in understanding the Raman modes in MoS2 in simpler manner? I am going through earlier work on Raman spectroscopy of MoS2, everywhere they mention the two modes E1^2g...

21 March 2021 6,254 5 View

Can a semi-conductor material have different absorption coefficient?

Does the absorption coefficient of the semiconductor changes with the change in the structure of the semiconductor? If you have a thin film and nanowire of the same semiconductor, will the...

24 February 2021 9,994 4 View

What is the mechanism behind the formation of thinfilm from spin coating technique?

Can someone help me in understanding the mechanism behind the thin film growth during solution-processed techniques like a spin coating? I want to know the details about mechanism like...

06 December 2020 5,924 6 View

Are solar cells operated under any kind of bias or not?

I am trying to understand the physics behind solar cells. As far as I know, they work simply on the principle of pn junction diode. The optically generated charge carried are transported to the...

17 November 2020 356 7 View

What does the trap state lifetime refer in the recombination process?

In the charge carrier recombination mechanism, trap assisted recombination occurs which is non-radiative in nature. The lifetime is often interpreted as a trap state. Is this the lifetime where...

04 October 2020 5,009 1 View

Why is the PL from the Perovskite grain interior more than that at the Grain boundary?

I am trying to understand the effect of the grain boundaries on the emission and absorption profile of perovskite grain. I found few papers mentioning the PL will be more from grain interiors than...

15 September 2020 9,222 1 View

Can anyone please help me in extracting the spectra from the image obtained from the CCD?

I obtained the image from CCD using the LabVIEW program. Now I need to get the spectral feature from this image. I have the calibrated wavelength for this as well. I will be glad if anyone...

16 July 2020 425 1 View

I am new to ultrafast spectroscopy. Can anyone explain mean what chirp correction meant and is there any way of doing it ?

I am doing transient absorption measurement from femtosecond laser.

01 May 2019 8,256 2 View

I am trying to pattern nanoparticles over the glass substrate by using dip pen nanolithography (DPN). Can anyone suggest me the procedure for it?

I am using DPN 5000 series for this. When I am calibrating the ink, I folowed all the steps on the manual but I couldn't get any test patterns on the substrate. Then I tried to draw the pattern on...

11 September 2018 9,014 1 View