Univerzita Pardubice Fakulta chemicko- technologická

Univerzita Pardubice

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Publikace detail

Transport properties deviation of polycrystalline Bi2O2Se: Causes and solution

Autoři: Zich Jan | Sojka Antonín | Navrátil Jiří | Drašar Čestmír

Rok: 2024

Druh publikace: ostatní - přednáška nebo poster

Strana od-do: nestránkováno

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
eng	Transport properties deviation of polycrystalline Bi2O2Se: Causes and solution	Bismuth oxyselenide (Bi2O2Se) is a promising thermoelectric (TE) material known for its high carrier mobility, nontoxic composition, and costeffectiveness. However, its low intrinsic electrical conductivity necessitates doping to enhance performance. A major challenge is the significant variation in transport properties of bulk polycrystalline samples, even when synthesized using similar methods. This study examines the causes of these deviations and suggests solutions. Through analysis of literature and synthesis of samples using different compounds and methods, we identified that impurities and foreign phases significantly impact the transport properties of undoped Bi2O2Se. Techniques such as powder Xray diffraction (PXRD), scanning electron microscopy/energy dispersive Xray spectroscopy (SEM/EDS), Raman spectroscopy, and ATR IR spectroscopy were used to detect these impurities. To combat this issues, we propose a reproducible lowtemperature solidstate synthesis process to produce highpurity Bi2O2Se. This method minimizes presence of high temperature associated secondary phases and ensures a consistent crystal structure, leading to improved and reliable transport properties. By refining synthesis techniques and controlling impurity levels, we aim to establish a standard for achieving consistent performance in Bi2O2Se