Vivek Beladiya

8 Questions 16 Answers 0 Followers

Questions related from Vivek Beladiya

How to avoid pin holes in molybdenum thin films?

I am depositing molybdenum on soda lime glass to be used as back contact for solar cell(CZTS) application using sputtering (magnetron). I have deposited ~500nm film at various temperatures and...

09 September 2014 1,271 12 View

How does excitation wavelength of laser effect Photoluminescence of any material or semiconductor material in PL Spectroscopy?

How do we choose excitation wavelength of Laser for PL measurement? On what do its selection depend on? I am trying to understand the basic concept for the PL spectroscopy, hence any fundamental...

09 September 2014 7,239 11 View

Which is the best method or technique to determine bandgap of material?

I am developing CZTS(Cu2ZnSnS4) (kesterite)(for solar cell application) thin films by sputtering. I wanted to know the most convenient and reliable method to determine bandgap of the...

08 August 2014 5,221 29 View

4probe measurement: I-V value increases till certain value then on further rotating current knob, v and I both decrease? What might be the reason?

I am depositing Al:ZnO on soda lime glass by sputtering. On four probe resistivity measurement I found on increasing current, voltage increases till some maximum value and after that further...

03 March 2014 7,384 6 View

What is the most reliable method for determining composition in thin films?

I am investigating Cu2ZnSnS4 material for solar cell application. I have co-sputtered Cu, Zn and Sn. By going through literature survey people have used several techniques like EDAX, XPS some also...

01 January 2014 3,422 4 View

What value of peak shift (+ or -) is acceptable in XRD data of thin film deposited sample in reference to ICDD data ?

I have deposited Cu2ZnSnS4 (CZTS or kesterite) films on Mo coated Soda Lime Glass. We have XRD data with some peaks shifted with 0.05 to 1 degree (+/-). What might be the possible cause of this...

10 October 2013 4,029 10 View

How is CZTS or CIGS a p-type (or n type) semiconductor?

In silicon we use to dope pentavalent or trivalent impurities to make n type or p type semiconductor respectively. In case of CIGS and CZTS its structure itself makes it P type or N type. I think...

07 July 2013 5,140 2 View

How can you know the material is of direct band gap or indirect bandgap?

Is there any characterization technique or any tool(method) available?

06 June 2013 4,713 16 View