17 Questions 32 Answers 0 Followers
Questions related from Albert Juma
Most publications I have come across on metal chalcogenides deposited by CBD have shown thin films of thickness in the order of tens up to hundreds of nm. I would like to deposit CuSbS2 and CuSnS2...
09 September 2017 6,563 2 View
I have several nanopowder samples synthesized in our lab and I would like to compare their absorbances as a function of the various treatments. We have a uv-vis spectrophotometer, so please advise...
08 August 2015 2,486 5 View
To perform electrical measurements on thin film devices, we always need ohmic metallic contact electrodes. The most commonly used metals are Au and Al. I would like to use carbon paste but I have...
11 November 2014 1,228 2 View
I want to deposit zirconium oxide by spray pyrolysis. I am not a chemist and I need the advice of chemists out there. Is zirconium acetylacetonate soluble in ethanol? I found that it is soluble...
10 October 2014 7,270 5 View
I have done impedance measurements of a metal-oxide-semiconductor structure as a function of the bias voltage. The radius of the impedance arc in the Nyquist plot decreases with and increase in...
10 October 2014 7,944 3 View
For thicker homogeneous films, the optical reflectance and transmittance spectra show several interference patterns which can be used to obtain optical constant using Swanepoel and other related...
10 October 2014 5,795 10 View
I am preparing to start working on thin film transistor (TFT) devices from metal oxides. In literature I have seen most people use semiconductor parameter analyzers for measuring drain current as...
09 September 2014 7,190 5 View
I want to fabricate thin film transistors as part of my new research work. I would like to know how I can make good masks that I need to use during deposition of the different layers....
05 May 2014 3,459 2 View
The difference in the deposition rates in sprayed thin films between different precursors in highly dependent on their decomposition temperatures, and residence time on the substrate. How do I get...
02 February 2014 6,601 2 View
I sprayed my samples by nebulizing/atomizing a precursor solution of InCl3 salt dissolved in ethanol solvent. I would like to know the size of the aerosol droplet. Is there a way of calculating...
01 January 2014 6,888 6 View
How does the nature of the band gap (direct or indirect) affect the efficiency of a solar? Recombination processes must be different for solar cells made from these solar cells, how does this...
11 November 2013 265 7 View
Some processes like diffusion or conductivity can be phonon assisted. Discussing this in the light of the Meyer-Neldel (compensation) rule, which is due to multi-phonon processes according to the...
11 November 2013 4,165 4 View
I know about abrupt and graded heterojunctions and have read about metallurgical junctions but I have not seen a good example of a metallurgical heterojunction. For example, how can one explain a...
08 August 2013 9,432 4 View
After calculating absorption coefficient from measured transmission and reflection data, we usually present it on photon energy scale. Most people use a factor of 1240 to convert the scale from...
07 July 2013 6,769 21 View
I know ionization potential can be obtained by adding the work function to the valence band maximum, which can be both determined directly from a UPS/XPS spectra. I was wondering if this is...
04 April 2013 1,399 5 View
I am investigating diffusion of Cu in In2S3 layers with and without chlorine and the activation energies and pre-exponential factor D0 are different for the two sets of layers. Structural...
04 April 2013 9,053 9 View
In2S3 is deposited to penetrate nanoporous TiO2 pores. I would like to investigate and describe the quality penetration of In2S3 and how much and how deep it penetrates.
02 February 2013 9,705 1 View
