Post-graduate theses
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Identifier |
000458418 |
Title |
Synthesis and characterization of 2D layered halide perovskite quantum wells |
Alternative Title |
Σύνθεση και χαρακτηρισμός 2Δ στρωματικών αλογονούχων περοβσκιτών ως κβαντικά πηγάδια |
Author
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Παντούσας, Απόστολος
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Thesis advisor
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Στούμπος, Κωνσταντίνος
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Reviewer
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Αρματάς, Γεράσιμος
Πελεκάνος, Νικόλαος
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Abstract |
Perovskites are a class of semiconducting materials with great interest in optoelectronic applications due to their high efficiency, high absorption coefficients and low cost. Two-dimensional (2D) perovskite structures provide the ability to further tune these properties and manufacture high-performance devices. In this work, we focus on the synthesis and characterization of a new homologous series of 2D layered lead halide perovskites based on the CH3NH3PbBr3 bulk perovskite. The homologous series, with general formula (CH3(CH2)5NH3)2(CH3NH3)n-1PbnBr3n+1, where n corresponds to the number of layers of the perovskite, produces a fertile ground for the study of quantum wells, since the alternating organic and inorganic layers generate a natural, periodic quantum well structure . By tuning the thickness, we control the degree of dielectric and quantum confinement of the photogenerated carriers inside the inorganic layers, thus creating a series of compounds with tunable optical properties in the visible spectrum range. The compounds were synthesized in pure form and their crystal structure was determined via single-crystal X-ray diffraction. The structural phase transitions were monitored via Differential Scanning Calorimetry (DSC) in the -80 – 120 oC temperature range while the optical properties were studied via steady-state and time-resolved photoluminescence (PL) spectroscopy in the -195- 25oC temperature range. The results suggest that the new compounds are excellent excitonic model systems and can be employed in specific applications like LEDs and lasers.
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Language |
English |
Subject |
Περοβσκίτες |
Issue date |
2023-07-19 |
Collection
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School/Department--School of Sciences and Engineering--Department of Materials Science and Technology--Post-graduate theses
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Type of Work--Post-graduate theses
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Permanent Link |
https://elocus.lib.uoc.gr//dlib/c/2/3/metadata-dlib-1694154728-144900-23337.tkl
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Views |
618 |