Anomalous electrical conductivity change in MoS2 during the transition from the amorphous to crystalline phase

Kód výsledku v IS VaVaI

RIV/00216275:25310/23:39920416 - isvavai.cz

Výsledek na webu

https://www.sciencedirect.com/science/article/pii/S0272884222034241?via%3Dihub

DOI - Digital Object Identifier

10.1016/j.ceramint.2022.09.242

Jazyk výsledku

angličtina

Název v původním jazyce

Anomalous electrical conductivity change in MoS2 during the transition from the amorphous to crystalline phase

Popis výsledku v původním jazyce

Transition metal dichalcogenides exhibit unique properties, which make them interesting for fundamental studies and for applications in many devices. Here, we report on the anomalous electrical behavior during the amorphous-to-crystal phase transition of MoS2. While crystallization typically results in an increase in conductivity, the situation in MoS2 is opposite. Amorphous MoS2 shows a sheet resistance of 3.2 x 103 omega with the value remaining nearly constant until 200 degrees C, MoS2 samples annealed above 200 degrees C exhibit an unexpected two-step increase in sheet resistance. The first abrupt increase takes place after annealing at temperatures between 300 and 400 degrees C while the second increase occurs after heating to 700 degrees C with typical sheet resistance values of 1.2 x 105 and 8 x 106 omega after heating to 500 degrees C and 900 degrees C, respectively. Using a combination of X-ray photoelectron spectroscopy and X-ray diffraction studies and ab-initio modeling, we argue that the large electrical conductivity observed in amorphous MoS2 is associated with the existence of a large quantity of Mo-Mo homopolar bonds that exceed the percolation threshold. The dramatic increase in the sheet resistivity in the first step is accompanied by the formation of the Mo-S bonds upon the disassociation of homopolar Mo-Mo bonds for a further increase in the sheet resistance upon annealing temperatures of 700 degrees C that can be attributed to the grain boundary formation during crystallization of MoS2 into the 2H layered structure.

Název v anglickém jazyce

Anomalous electrical conductivity change in MoS2 during the transition from the amorphous to crystalline phase

Popis výsledku anglicky

Transition metal dichalcogenides exhibit unique properties, which make them interesting for fundamental studies and for applications in many devices. Here, we report on the anomalous electrical behavior during the amorphous-to-crystal phase transition of MoS2. While crystallization typically results in an increase in conductivity, the situation in MoS2 is opposite. Amorphous MoS2 shows a sheet resistance of 3.2 x 103 omega with the value remaining nearly constant until 200 degrees C, MoS2 samples annealed above 200 degrees C exhibit an unexpected two-step increase in sheet resistance. The first abrupt increase takes place after annealing at temperatures between 300 and 400 degrees C while the second increase occurs after heating to 700 degrees C with typical sheet resistance values of 1.2 x 105 and 8 x 106 omega after heating to 500 degrees C and 900 degrees C, respectively. Using a combination of X-ray photoelectron spectroscopy and X-ray diffraction studies and ab-initio modeling, we argue that the large electrical conductivity observed in amorphous MoS2 is associated with the existence of a large quantity of Mo-Mo homopolar bonds that exceed the percolation threshold. The dramatic increase in the sheet resistivity in the first step is accompanied by the formation of the Mo-S bonds upon the disassociation of homopolar Mo-Mo bonds for a further increase in the sheet resistance upon annealing temperatures of 700 degrees C that can be attributed to the grain boundary formation during crystallization of MoS2 into the 2H layered structure.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20504 - Ceramics

Projekt

GA19-17997S: Přechod mezi amorfním a krystalickým stavem (3D2D) u chalkogenidových materiálů vázaných van der Waalsovou vazbou

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Ceramics International

ISSN

0272-8842

e-ISSN

1873-3956

Svazek periodika

49

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

7

Strana od-do

2619-2625

Kód UT WoS článku

000905085600001

EID výsledku v databázi Scopus

2-s2.0-85139711760