Christoph Wolf

6 Questions 9 Answers 0 Followers

Questions related from Christoph Wolf

Does anyone know a source for LEDs with known emitter material and emission zone structure?

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 4,001 1 View

Large Huang-Rhys parameters from temperature dependent absorption but very narrow PL emission - implications?

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 6,316 3 View

What is the best instrumentation choice for measuring absorption of rough thin film samples?

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 3,015 6 View

What is the temperature dependence of the PL intensity in an indirect band-gap material?

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 6,936 2 View

How do I treat the transition between excitonic absorption and the Urbach tail?

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 2,772 0 View

How do I simulate Capacitance-Voltage (CV) characteristics of a Schottky contact using COMSOL?

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 7,428 2 View