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Questions related from Bibek S Dhami
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 951 1 View
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 2,503 0 View
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 3,754 4 View
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 6,268 5 View
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 10,039 4 View
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 5,995 6 View
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 387 7 View
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 5,020 1 View
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 9,238 1 View
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 461 1 View
As far as I understand both of these techniques are based upon exciting the samples and collecting the emission spectra. In Pl measurement, a sample is photoexcited and if the energy is above the...
26 May 2020 8,504 2 View
I am reading papers relating to the lasing. Almost all of them talk about the laser pump fluence and they discuss the photoexcited charge carrier densities. Can anyone guide me on how to...
20 April 2020 166 0 View
I have the experimental data from the ultrafast spectroscopy but the data contains a lot of noise. I want to filter the noise from data using Fourier filtering. Can anyone guide me on this way of...
03 April 2020 3,904 0 View
I am trying to get grains of perovskite for which I am using hot casting method. I made solution of methyl ammonium iodide and lead iodide in DMF. I am sometime getting wires like structure and...
21 June 2019 4,921 6 View
I am doing transient absorption measurement from femtosecond laser.
01 May 2019 8,267 2 View
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 9,023 1 View
