A5058794065- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Semiconductor materials and interfaces
- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Copper-based nanomaterials and applications
- Phase-change materials and chalcogenides
- Astro and Planetary Science
- Perovskite Materials and Applications
- Thin-Film Transistor Technologies
- ZnO doping and properties
- Planetary Science and Exploration
- Spacecraft Design and Technology
- Advanced Semiconductor Detectors and Materials
- Nanowire Synthesis and Applications
- Gas Sensing Nanomaterials and Sensors
- Advanced Electron Microscopy Techniques and Applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Force Microscopy Techniques and Applications
- Integrated Circuits and Semiconductor Failure Analysis
- Molecular Junctions and Nanostructures
- Isotope Analysis in Ecology
- Organic Light-Emitting Diodes Research
- Ga2O3 and related materials
Friedrich-Alexander-Universität Erlangen-Nürnberg
2022
Carl von Ossietzky Universität Oldenburg
2013-2017
University of Würzburg
2008-2010
Lead–Tin perovskite solar cells (Pb/Sn PSCs) are limited by the intrinsic instability of Sn(II), which tends to oxidize forming Sn vacancies in films. Herein, a Lewis base β-guanidinopropionic acid (GUA) and hydrazinium iodide (HAI) introduced effectively passivate bulk surface, respectively. The synergistic approach leads Pb/Sn PSCs with promising power conversion efficiency 20.5% owing significantly reduced nonradiative recombination voltage losses. As result, VOC × FF product is improved,...
In order to improve the performance of chalcopyrite Cu(In1 − x,Gax)(Se1 ySy)2 solar cells, implementation a bandgap widening at absorber/buffer interface via an increase [S]/[S + Se] ratio is investigated. this work we examine industrially processed samples, which were fabricated deposition-reaction process with varied H2S pressure during rapid thermal processing (RTP). Precursors exposed crucial amount sulfur RTP step resulted in samples significantly improved device performance. The open...
A polyradical consisting of alternating triarylamine and perchlorotriphenylmethyl radical moieties was synthesized by Horner−Emmons reaction. This compound is the first polymeric neutral mixed-valence that shows an intervalence charge transfer (IV-CT) band in NIR. Comparison absorption spectra polymer with those a reference monomer IV-CT transition confined to one repeating unit. HOMO LUMO levels are at −5.5 −4.5 eV vs vacuum, respectively, as estimated cyclic voltammetry. very low exciton...
Aliovalent-doped metal oxide nanocrystals exhibiting localized surface plasmons (LSPRs) are applied in systems that require reflection/scattering/absorption infrared and optical transparency visible. Indium tin (ITO) is currently leading the field, but indium resources known to be very restricted. Antimony-doped (ATO) a cheap candidate substitute ITO, it exhibits less advantageous electronic properties limited control of LSPRs. To date, LSPR tuning ATO NCs has been achieved electrochemically...
The charge transport properties of thin films sol-gel processed undoped and Al-doped zinc oxide nanoparticles with variable doping level between 0.8 10 at.% were investigated. x-ray diffraction studies revealed a decrease the average crystallite sizes in highly doped samples. We provide estimates conductivity resulting carrier densities respect to level. increase density due extrinsic was compared accumulation carriers field effect transistor structures. This allowed us assess scattering...
We demonstrate an approach to improve poly-3-hexylthiophene field effect transistors by modifying the gold contacts with monolayer thick pentacenequinone (PQ) or naphthalene (NL). The effective contact resistance is reduced a factor of two and sixteen for interlayers PQ NL, respectively. observation attributed different injection barriers at metal-organic interface caused functionalization additional tunneling barrier enhancing on/off ratios. This yields activation energies 37 meV (NL) 104...
A novel method is presented, combining site-specific TEM sample preparation and in-situ STEM analysis in a dual-beam microscope (FIB/SEM) fitted with chamber mounted nano-manipulator. samples are prepared using modified in-situ, lift-out method, whereby the thinned oriented for immediate tilt, translation, rotation capabilities of FIB/SEM stage, nano-manipulator, cassette. This cassette can provide second tilt axis, orthogonal to stage so that image contrast be optimized reveal structural...
We present a study on the temperature and film depth dependent phase formation in Cu-Zn-Sn-Se thin films. Zn/Sn/Cu precursors were selenized at different temperatures, followed by depth-resolved Raman profiling. A high resolution for analysis was achieved special sample preparation step using focused ion beam to prepare shallow angle cross sections (SACS) of absorber. Multi-phase structures observed low selenization temperatures with first quaternary Cu <sub...