Gain photodetectors offer large photoresponse towards small optical signals. Despite having achieved high external quantum efficiency (EQE), current gain organic photodetectors (OPDs) generally suffer from narrow spectral sensitivity, slow response time and/or large operating voltage for achieving a favorable gain. So far, strategies tackling one o...
Infrared photodetectors are sought for diverse applications and their performance relies on photoactive materials and photocurrent generation mechanisms. Her; we fabricate IR photodetectors with heavily hydrogen-doped VO2(i.e., HVO2) single-crystalline nanoparticles which show two orders greater resistivities than pure VO2. The I-V plots obtained u...
Face à l’émergence de l’imagerie multi et hyperspectrale, il existe une demande croissante de connaissance fine de la réponse spectrale des détecteurs infrarouge. Dans ce travail de thèse, nous proposons une démarche de modélisation optique des réponses spectrales des plans focaux infrarouge HgCdTe. L’objectif est de mieux maîtriser les origines ph...
We report inelastic neutron scattering experiments on a single crystal of the intermediate valence compound CePd3. At 300 K the magnetic scattering is quasielastic, with half-width G = 23 meV, and is independent of momentum transfer Q. At low temperature, the Q-averaged magnetic spectrum is inelastic, exhibiting a broad peak centered near E-max = 5...
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Two anthracene-based star-shaped conjugated small molecules, 5,5-(9,10-bis((4-hexylphenyl)ethynyl)anthracene-2,6-diyl)bis(5-hexyl-2,2-bithiophene), HBantHBT, and 5,5-(9,10-bis(phenylethynyl)anthracene-2,6-diyl)bis(5-hexyl-2,2-bithiophene), BantHBT, are used as electron-cascade donor materials by incorporating them into organic photovoltaic cells pr...
Germany
In the thesis presented here, calorimetric low temperature detectors were for the first time applied in accelerator mass spectrometry (AMS) to determine the isotope ratio of "2"3"6U to "2"3"8U in several samples of natural uranium. The detectors consist of a superconducting aluminium film deposited onto a sapphire absorber which is used as thermist...
Energy dispersive Silicon Drift Detectors (SDDs) show a superior performance compared with other semiconductor detectors, but low energy X-rays generates an undesirable high background due to incomplete charge collection (ICC) in the entrance window. To investigate the reasons for charge losses, a discrete analytic calculation is performed. All los...
We report upon the design, construction and operation of a prototype for a high-granularity tile hadronic calorimeter for a future international linear collider(ILC) detector. Scintillating tiles are read out via wavelength-shifting fibers which guides the scintillation light to a novel photodetector, the Silicon Photomultiplier. The prototype has ...
