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Questions related from Albert Juma
Bode plots show the magnitude of the impedance and phase as a function of the frequency. If the slope of the Bode magnitude graph is -1, either in mid or high frequency range, what information...
22 September 2015 7,069 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...
10 November 2014 1,855 4 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...
31 October 2014 9,279 4 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...
11 October 2014 3,578 2 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...
09 October 2014 6,519 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...
19 September 2014 490 4 View
I have a set of impedance spectroscopy data that I am analyzing. I see the phase angle - among other parameters changing systematically with annealing temperature and bias voltage. Example: the...
04 August 2014 9,361 3 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....
14 May 2014 8,215 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...
22 January 2014 1,019 5 View
In determining the optical band gap from absorption coefficient spectra, one can determine whether the band gap is direct or indirect. Depending on the exponent used, it can be allowed or...
28 November 2013 3,269 7 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...
26 November 2013 6,181 6 View
We would like to find a suitable solvent for lead iodide (PbI2) that can be nebulized easily for deposition by spray pyrolysis. PbI2 is soluble in DMF(N,N-dimethylformamide) but this is not good...
14 October 2013 6,499 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...
25 August 2013 3,334 3 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...
22 April 2013 6,570 8 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...
12 April 2013 1,183 5 View
