Sebastian FiechterHelmholtz-Zentrum Berlin | HZB · Scientific Administration
Sebastian Fiechter
Prof. Dr. rer. nat.
About
322
Publications
35,452
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
11,245
Citations
Introduction
Summarizing reseach in the field of photoelectrochemistry and electrocatalysis for water splitting.
Publications
Publications (322)
Polycrystalline layers of As-doped pyrite (FeS2) have been produced in bromine atmosphere with the aim of developingthis sulfide material for solar energy applications. Its photoelectrochemical behavior in contact with an aqueousI3–/I2 electrolyte was investigated. It operated as a photoelectrochemical solar cell and showed reasonably stable behavi...
The molar heat capacities of five argyrodite compounds have been measured in the temperature range, 2–500 K by adiabatic and differential scanning calorimetry. The heat capacity of two other chalcogenides, Cu3PS4 and Ag3PS4, has been determined between 100 and 500 K. The Cu6PS5HAL (HAL = Cl, Br, I) compounds show structural phase transitions at 241...
The molar heat capacities of Cu6PS5Hal (Hal = Cl, Br, I) have been measured in the temperature range 2 to 500 K. From these data the thermodynamic standard values of entropy, enthalpy and Gibbs free energy were calculated, the heats of formation were computed from the results of vapour pressure measurements and specific heat data. The structural ph...
Durch chemischen Dampftransport in Gegenwart von geschmolzenem Cul erhaltene rote, transparente (′ubPSgl-Kristalle (kubische Hochtemp-Struktur, F43m, Z=4, "ArgyodiP-Typ, mit fehlgeordnetem Cu-Kationen-Subgitter, Cu l -leitend) wurden mit konz. HNO; bei 50°C (20 min) behandelt.
The agyrodite Cu//6// minus //xPS//5I is simultaneously a copper ion conductor and a p-type electronic semiconductor. With an energy gap of DELTA E//G equals 2. 05 ev, the compound intercalates copper upon illumination as demonstrated in photoelectrochemical experiments. The intercalation of copper is accompanied by a color change which is believed...
Photoactive pyrite layers, whose preparation and use represent a commercially highly interesting alternative to materials hitherto in common use. The semiconductor material chiefly used until now, e.g. for solar cells, is silicon. However, its costs of manufacture are too high to allow solar cells to be made at favorable cost. The significance of t...
Cu6PS5Hal compounds (with Hal = Cl, Br or I) have been crystallized around 950 K by CVT with P, S and Hal (and combinations thereof). Chemical insight into the transport processes was gained from dissociation pressure measurements and spectroscopic vapour analysis. Lacking thermochemical data of the compounds were obtained from Cp measurements. Mod...
Single crystals of Cu6PS5Hal (Hal = Cl, Br, I) have been grown by dissociative sublimation and by chemical vapour transport with P, S, Hal, CuHal and combinations thereof as transporting agents in the temperature range 800 to 1000 K. Microscopic observation of the tetrahedral faces revealed several growth features. Macrosteps, closed loop steps and...
Freiburg (Breisgau), Univ., Diss., 1982.
The growth of single crystalline argyrodites of type Cu8 xGeX6 xYx X S, Se; Y I is reported. These materials undergo solid solid phase transitions at temperatures ranging from 30 C to 90 C. In the high temperature phase, Cu8GeS6 crystallizes in the cubic space group . In the low temperature phase, the compound is present in the orthorhombic space g...
Internal report | Preprint Temporary entry
