The beamline is UE-52 PGM, which serves two end-stations, CoESCA station and Nano Cluster Trap station. It’s a soft X-ray undulator beamline with photon energies up to 1600 eV. Read More →
The beamline is called PM4. As a dipole beamline, it provides a moderate photon flux over a wide range of photon energies, in our case in the vacuum ultraviolet/soft X-ray regime. It serves the fixed end-station called LowDosePES. As the name suggests, its specialty is photoemission spectroscopy (PES) at low X-ray dose. Read More →
Actually, I had a funny-bad experience in my first week living in Berlin. On that day, I just wanted to survey “how to reach HZB from apartment”. I was accompanied by my mom and dad. We bought single trip ABC ticket from Jungfernheide (near Charlottenburg) station since we hadn’t known yet about the zone. The outbound journey was fine, we took S41 then S7 to Wannsee and 318 bus. There was also a ticket checker but we passed it. When we did the return journey, we got some problems. At first, the ticket machine couldn’t be changed into English version. Our phone were alsoRead More →
Ingredients: kesterite bulks, carbon boats, liquid nitrogen, quartz ampoule Hi everybody today we are going to prepare one of my favorite “dishes”- Homogeneous kesterite. But first of all, put on gloves and lab coats to protect yourself from accidents. Preparation can be divided in the following steps: 1.Grinding Put kesterite bulks in an agate mortar and grind them using a pestle until you obtain a homogenous mass (powder). Imagine that you are making mashed potatoes. 2.Pressing pellets Use a hydraulic press to turn your powders into cylindrical pellets. To do this, fill the pressing tool with the powder and press it for 5 minutes. WhenRead More →
In order to make use of the current produced in a solar cell, one needs electrodes and cables to transport the produced charge carriers to the consumer – but how do the charge carriers reach the electrodes? In many solar cell types, a conductive material is necessary. As the sunlight still needs to reach the absorber layer (where the energy-transfer from photons to electrons and thus the generation of the charge carriers happens), this material not just needs to be conductive but also transparent in a wide wavelength range. This difficult task is taken over by Transparent Conductive Oxides (TCOs). Metal oxides have shown toRead More →
Behind The Camera Berlin!!! I haven’t ever thought of coming to Berlin. It is actually like a dream for every people in our country. I live in a country named Bangladesh where people struggle every day to meet their fundamental rights such as food, education, health, etc. Our country has a lot of people compare to the area of her. So it is natural that she doesn’t have that much quality educational institution for pursuing higher education. Every year a lot of people compete to get into the public university but only a few can make it. Considering all these struggles and scenarios, it isRead More →
OK, here we are. My name is Vlad. I’m a summer student from Moscow and the author of this note concurrently. If you are reading this post, I bet 90% you was interested in the title. But I suggest to talk about it a bit later. Just for the beginning , everything you need to know about solar cells is that they consist of silicon. The second point is that the first one was a lie. In fact, not only silicon is used in solar cells. Since the moment people decided to use solar cells as a real source of energy, scientists have been workingRead More →
I want you to imagine the sun with wrong rays that cause a lot of problems. We cannot enjoy the sunshine. We want to do something to replace the wrong rays with the right ones. In my scientific project, the sun is germanium (Ge) nanoparticles, and the rays are a ligand. The wrong ligand is oleylamine. Oleylamine is an organic molecule containing an amino group and a long hydrocarbon chain. It would be perfect to remove oleylamine from the particles and attach another molecule. Speaking in scientific language, I am trying to do ligand exchange on germanium nanoparticles surface. Why germanium? Firstly, Ge is anRead More →
If you imagine an atom being of the size of a cherry then a quantum dot (QD) is a watermelon. Although it is much bigger than an atom, a QD is still a small object, nanometers long, and it preserves atomic features. One of them is a discrete energy spectrum. For this reason, many people address QDs as „artificial atoms“.
The great thing about QDs is that …Read More →
“If, in some cataclysm, all of scientific knowledge were to be destroyed, and only one sentence passed on to the next generations of creatures, what statement would contain the most information in the fewest words? I believe it is the atomic hypothesis (or the atomic fact, or whatever you wish to call it) that all things are made of atoms—little particles that move around in perpetual motion, attracting each other when they are a little distance apart, but repelling upon being squeezed into one another. In that one sentence, you will see, there is an enormous amount of information about the world, if just aRead More →