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000912414 0247_ $$2doi$$a10.1016/j.flatc.2022.100447
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000912414 1001_ $$0P:(DE-Juel1)128613$$aMikulics, Martin$$b0$$eCorresponding author$$ufzj
000912414 245__ $$aNano-LED driven phase change evolution of layered chalcogenides for Raman spectroscopy investigations
000912414 260__ $$aAmsterdam$$bElsevier$$c2022
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000912414 520__ $$aWe present a device driving testing platform based on vertically integrated nano light emitting diodes (nano- LEDs). The nano-LEDs with a peak wavelength emission centered at ~ 445 nm were arranged in arrays and conditioned using a laser-micro-annealing process to individually tune their intensity. They were coupled with freestanding monocrystalline Ge1Sb2Te4 nano-membranes with three different thicknesses (~40, ~ 60 and ~ 90 nm) with the aim of initializing ultrafast switching processes and of observing phase changed states simulta- neously by Raman spectroscopy. Raman spectroscopy studies reveal that the optical pulses emitted from the nano-LEDs induce substantial, local changes in the nano-membranes’ states of the Ge1Sb2Te4 layered material. Beside the crystalline state in non-exposed areas (as-grown material), amorphous and different intermediate states were identified in exposed areas as island-like structures with diameters ranging from ~ 300 nm up to ~ 1.5 µm. The latter confirms the nano-LEDs’ emission role in both near- and far-field regimes, depending on the distance between nano-LED and nano-membrane, for driving i.e. inducing the phase change process. The results presented demonstrate the suitability and potential of the vertically integrated nano-LEDs as the key components for a testing platform/for electro-optical convertors driving phase change processes in optically active media. They could also play an important role in the development of future, e.g., non-volatile data storage as well as in optical and neuromorphic computing architectures based on transmistor devices.
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000912414 7001_ $$0P:(DE-Juel1)130495$$aAdam, Roman$$b1$$ufzj
000912414 7001_ $$0P:(DE-HGF)0$$aRoman Sobolewski$$b2
000912414 7001_ $$0P:(DE-Juel1)173665$$aHeidtfeld, Sarah$$b3$$ufzj
000912414 7001_ $$0P:(DE-Juel1)177876$$aCao, Derang$$b4
000912414 7001_ $$0P:(DE-Juel1)130582$$aBürgler, Daniel E.$$b5$$ufzj
000912414 7001_ $$0P:(DE-Juel1)130948$$aSchneider, Claus M.$$b6$$ufzj
000912414 7001_ $$0P:(DE-Juel1)130824$$aMayer, Joachim$$b7$$ufzj
000912414 7001_ $$0P:(DE-Juel1)125593$$aHardtdegen, Hilde Helen$$b8$$eCorresponding author$$ufzj
000912414 773__ $$0PERI:(DE-600)2873498-1$$a10.1016/j.flatc.2022.100447$$gVol. 36, p. 100447 -$$p100447 -$$tFlatChem$$v36$$x2452-2627$$y2022
000912414 8564_ $$uhttps://juser.fz-juelich.de/record/912414/files/1-s2.0-S2452262722001143-main.pdf$$yOpenAccess
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