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In: Careers, International, Students

Dear all, October is officially a mental health awareness month. In order to raise awareness among the doctoral researchers, Helmholtz Juniors have prepared a series of informative letters to be sent out each Thursday in the course of October. However, since we – the team of representatives of the doctoral researchers at HZB – believe that this is a topic concerning everyone, we have decided to share some of this information with the whole HZB community. Take a moment, sit back, breathe and relax. We all know that doing a PhD can be really challenging, not only scientifically but also on the personal side. ThereRead More →

Picture: a sample of characterization done by Daniel with lots of patience.

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In: Corona, International, Summerstudents

During my studentship there is one thing I have discovered above all: patience. Patience is the mother of science, as the saying goes. And I have learned it the hard way. My project is a complex one; like most science projects. I’m trying to synthesize and characterize a new material to act as an absorber of light in solar cells. It is called: copper-barium diselenide. More specifically I want this material to be a top-cell absorber in tandem cells. In fact, this synthesis is not easy: little is known about the compound, and barium is very reactive with oxygen, so one must be very carefulRead More →

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In: International, Lightsources

A photostory at the end of this text reports about a special workshop at BESSY II. It was mid of november, in the night from sunday to monday, when a couple of accelerator scientists from MAX IV, BESSY II, CERN, KARA at KIT and DELTA from TU Dortmund gathered in the control room of BESSY II. They wanted to explore the so called two orbit or TRIBS modus in which one synchrotron could deliver two different sorts of light pulses. But let’s start with a short introduction: A Synchrotron Lightsource is a wonderful toolbox for doing research: it produces brilliant light pulses mostly in theRead More →

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In: International, Students, Summerstudents

“Be a diamond. Flourish under pressure” – Maureen Joyce Connolly To most people diamonds are well-known as the marvelous gemstones which used in a piece of jewelry. However, they are not only “a girl’s best friends”. Due to their remarkable physical and optical properties diamonds can be used by scientists and engineers as well! With this blogpost I’ll guide you through my research here at HZB and, hopefully, will share the delight and enjoyment of working with diamonds. Why diamonds? To have a better understanding of diamond it is useful to have a look at its crystalline structure. The strong sp3 covalent bonds between carbonRead More →

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In: Energymaterials, International, Summerstudents

Let’s spray and create samples ! In the institute of Solar Fuel, the main research is to produce hydrogen from sunlight and water. Hydrogen can be used to easily store energy and also directly for transportation. But how can we produce it? Only from the sunlight, a metal oxide semiconductor and water. Photons from sunlight will be absorbed by the metal oxide, and this will generate electrons and holes which oxidize or reduce water. The reaction between the electron and hole and the electrolyte allows to separate water in oxygen and hydrogen. Let’s see how we make this metal Oxide! SPRAY PYROLYSIS: The chemical methodRead More →

Jian Ren and Prof. Brian Paul Schmidt in #LINO19

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In: Conference, Energymaterials, International, Students

Science Without Borders: Impressions from the 69th Lindau Nobel Laureate Meeting (2019) Guestpost by Jian Ren As a doctoral researcher in Helmholtz-Zentrum Berlin, I have been offered many opportunities to expand my horizons by working in an optimal international research environment and by participating in international conferences. Recently, I received another gift from HZB – I was nominated and financially supported by HZB to take part in the Lindau Nobel Laureate Meetings. 580 young scientists meet Nobel Laureates The Lindau Nobel Laureate Meetings have become an event of great importance for the exchange between generations of scientists each summer since 1951. In this year, theRead More →

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In: Careers, Energymaterials

Adopting the reader’s perspective might help to set your proposal into a broader context and suggest relevant potential impact Some weeks ago, EU expert Seán McCarthy gave a workshop at HZB entitled “How to Write a Competitive Proposal for Horizon 2020”. The lecture hall was packed with scientists waiting for instructions and McCarthy delivered plenty. “The secret is understanding the evaluation process”, McCarthy pointed out. In other words: Put yourself into the shoes of the evaluators who will read your proposal and make the decisions. Peer reviewers want facts at a glance, details by further reading Scientific experts who may not be native English speakersRead More →

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In: Energymaterials, Summerstudents

Far-sighted hydrogen economy During one of the winter nights, while talking in the interior of Granite House, “well lighted with candles, well warmed with coal, after a good dinner”, the settlers of Jules Verne’s Mysterious Island were discussing about the fact that the coal will be entirely consumed. After a roughly estimation, Cyrus Harding, an engineer of great capabilities, concluded that it would happen “for at least two hundred and fifty or three hundred years.” To everyone’s surprise, when he was asked what they will burn instead of coal, he said: “Water”. “Water” cried Pencroft, “water as a fuel for steamers and engines! water toRead More →

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In: Energymaterials, Summerstudents

Have you ever been sitting in company, discussing ridiculous stories about your scars and injuries? Probably, yes. Once, I spent a whole evening talking about these funny cases with my friends. However, the story of the scar I got because of a hot radiator, was outshined by a guy who has gotten a serious burn while he was sleeping with a laptop on his knees. That day I didn’t believe his story, but later I noticed that occasionally my electronic devices heated up incredibly. “Nothing is perfect”, I thought and forgot about this episode for a while. A couple years later, I arrived in aRead More →

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In: International, Students, Summerstudents

If you try to search for “PSO” abbreviation in wiki you may find Pacific Symphony Orchestra or Phase-shift oscillator. However, my project at HZB is about neither music nor electricity, but mathematics. For almost a month here I have been working on an algorithm called Particle Swarm Optimization method and I would like you to have some impression of it.  Optimization Actually, the definition of optimization problem is quite simple. One has a function of n-variables f(x1, …, xn) and seeks to find such values of variables that give minimum to the function. However, the solution is not that simple, because in general you cannotRead More →