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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

Παντούσας, Απόστολος

Thesis advisor

Στούμπος, Κωνσταντίνος

Reviewer

Αρματάς, Γεράσιμος
Πελεκάνος, Νικόλαος

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.

Language

English

Subject

Περοβσκίτες

Issue date

2023-07-19

Collection

School/Department--School of Sciences and Engineering--Department of Materials Science and Technology--Post-graduate theses

Type of Work--Post-graduate theses

Permanent Link

https://elocus.lib.uoc.gr//dlib/c/2/3/metadata-dlib-1694154728-144900-23337.tkl