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Questions related from Zhanhao Hu
We are using Shimadzu SPM-9700HT AFM in the lab. It uses a 650nm laser for cantilever detection. I want to replace the laser to a longer wavelength to avoid excitation of fluorescent samples. If...
03 August 2023 9,832 2 View
Metal-halide perovskites are known to degrade under UV illumination at wavelengths seen in solar radiation. At far higher energy irradiation as that used in Ultraviolet photoemission spectroscopy...
13 April 2023 8,935 1 View
There are all types of plausible point defects in metal-halide perovskite crystals. Some are more prevalent than others due to a lower formation energy. Types of defects and their formation energy...
04 April 2023 1,869 2 View
Ultraviolet photoelectron spectroscopy (UPS) and Kelvin probe both yield the surface work-function of a sample. Suppose the following conditions: The Kelvin probe and UPS are in the same...
26 November 2019 6,664 4 View
I want to calibrate the work-function of our Kelvin probe using HOPG as a reference sample. For the commonly used SPI HOPG, there are three grades, SPI-1, SPI-2 and SPI-3. Is there any difference...
28 April 2019 6,270 10 View
Usually HOPG is used for calibrating Kelvin probe tip work-function. However I found if operated in the air, HOPG surface will quickly adsorb air species and the measured contact potential drifts...
09 April 2019 6,057 3 View
For example, I have obtain height and potential images on the sample from KPFM. Now I want to draw a line in the image, and compare the height profile and potential profile on exactly this...
15 February 2019 1,032 4 View
I am trying to set up a photoluminescent quantum efficiency measurement system using an integrating system. The commonly used Xe light source typically needs a prolonged time for warming up and...
13 December 2016 6,870 6 View
I have been using the ultraviolet photoemission spectroscopy (UPS) to look at the energy levels of quantum dots. My quantum dot has a core/shell structure, where the shell is supposed to have a...
06 October 2016 4,908 4 View
The growth mode of thin films is supposed to vary according to the interaction of the studied materials. For aluminum specifically, though, does it grow in an island mode or layer-by-layer mode on...
07 April 2016 3,648 0 View
The best dielectric material for PCBM field effect transistors seems to be BCB, or divinyltetramethyldisiloxane bis(benzocyclobutene). But curiously, I can't find any material company that sells...
21 December 2015 4,711 6 View
I am doing the research about printing OLED. The substrate is pixel-structured where polyimide is etched out to defined the RGB printing areas. Polyimide is not hydrophobic/oleophobic enough, and...
11 July 2015 5,467 2 View
