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Questions related from Christoph Wolf
Dear all! I am trying to buy a set of reference light-sources (ideally Ga-In-N based MWQ) with known emitter material and known structure. Since both are more or less IP of the companies most...
02 November 2016 4,005 1 View
Dear all! In DFT supercells are used to study surfaces by introducing artificial vacuum. But some publications use supercells even though they study (infinite periodic) bulk band-structures. Is...
05 July 2016 3,492 5 View
Dear colleagues! I have a question regarding the connection between absorption and emission of light in a poly-crystalline (solution processed inorganic) semiconductor. from absorption data I...
22 March 2016 6,321 3 View
Dear Colleagues! I am currently measuring the absorption of "absorbing thin films on non-absorbing substrate" type samples. The semiconductor material has a gap in the visible region and I am...
04 March 2016 3,022 6 View
Dear colleagues! In direct band-gap materials with increasing temperature the increasing probability of exciton dissociation decreases the PL intensity. In indirect band-gaps the increase in...
14 October 2015 6,942 2 View
Dear colleagues! I am wondering if there is any method to properly treat the transition from absorption by gap states (Urbach tail) to excitonic or band-to-band. When modelling all contributions...
30 September 2015 2,780 0 View
Dear Colleagues, I am currently trying to validate some CV data. Therefore I would like to model the CV characteristics (capacitance at different bias levels) I am new to COMSOL but it is the only...
26 May 2015 7,434 2 View
Dear Colleagues, I am trying to readout (current or capacitance) of a 16x16 sensor prototype. I am wondering what is the easiest way of reading the matrix (I am using a parameter analyzer)? Does a...
15 March 2015 1,247 1 View
