Ankit Goyal

10 Questions 23 Answers 0 Followers

Questions related from Ankit Goyal

How to be sure that acoustic vibrations are not contributing as optical phonons in nanoparticles casuing pseudo-direct bandgap behaviour?

I have seen a red shift with decreasing size of Si nanoparticles in Raman spectra. For bulk, I am having peak at 520 cm-1 and for 40 nm particle, the peak is shifted to 510 cm-1 and become...

20 September 2019 1,810 4 View

How to measure I/V on a polymer thin film solar cell?

I have prepared polymer solar cell on a ITO coated glass with the area of around 1 inch2. I am using four probe set up with sun simulator. The problem is when I am applying probes to the top...

28 November 2017 9,486 3 View

What could be the possible reasons responsible for poor fill factor in Si thin film solar cells?

I am working on Si thin film solar cells. I got voc of near 500 mV and Isc of about 25 mA/cm2 but with the fill factor of about 19 % only. Aluminum was base electrode and TCO was the front...

20 November 2017 6,660 12 View

I want to do dopant mapping in Si using Fano*Gauss function. Can anybody help me to write the function for it?

Raman spectroscopy is a now used by a few scientists to do dapant mapping in doped Silicon through some fit parameters and fitting.

09 November 2017 8,509 4 View

If we have a p-i-n structured silicon solar cell with the thickness of about 40 micron, then can we call it thin film or bulk?

The thickness of the intrinsic layer is about 25 micron. I would also want to know that how should I decide thickness and choice of electrode material for the aforesaid cell.

06 September 2017 4,484 7 View

Can anyone tell me how to analyze kikuchi lines obtained from TEM of thin film samples

I did TEM of thin film of Si on a glass substrate. The SAED pattern of the same has kikuchi lines. The study was done in simple diffraction mode without tilting sample. Please help me study...

16 August 2017 9,138 3 View

Is annealing necessary in case of silicon thin film solar cells before I/V characteriation?

I have sprayed silicon solar cells (p-i-n) on a glass substrate. The sprayed films are not stable and can be removed easily by touching it. I think I need to go for annealing of the films but I...

25 May 2016 694 7 View

How do I calculate crystallite size of irregular shaped silicon powder samples?

I am working on Silicon powders. I have added XRD results too in the attached file. Thanks and regards Ankit

30 December 2015 3,605 8 View

I noted reduction in grain size of Silicon thin film after sintering at 700 C compared to un-sintered Silicon powder. How is it possible? reference?

Grain size is calculated using deby-scherrer formula.

27 October 2015 9,835 5 View

How can I get proper dispersed Silicon powder in solution to obtain good UV-Vis-IR absorption spectra?

I have silicon nanopowders and want to calculate bandgap of it but getting wrong results and no absorption even in crystalline silicon powder. I tried DI and some organic solvents but it didn't...

13 July 2015 6,795 3 View