Zhanhao Hu

10 Questions 15 Answers 0 Followers

Questions related from Zhanhao Hu

How to change the laser unit of the AFM instrument?

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 9,785 2 View

Are metal-halide perovskites stable under UV irradiation in Ultraviolet photoemission spectroscopy measurement?

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 8,905 1 View

Is there any database on defect states of the metal-halide perovskite?

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 1,838 2 View

Difference of the work-function value obtained from UPS and Kelvin probe measurement?

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 6,636 4 View

Which grade of HOPG should I use for work-function calibration?

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 6,225 10 View

How to calibrate the Kelvin probe operated in air to determine work-function value?

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 6,019 3 View

In Gwyddion, how to extract the profiles in two channels at exactly the same region?

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 994 4 View

How to interpret the UPS spectrum of quantum dots?

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 4,874 4 View

Where can I buy BCB, the dielectric material for n-type organic field effect transistors?

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 4,670 6 View

How can I make the polyimide banks more hydrophobic/oleophobic on the pixel substrate?

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 5,431 2 View