Open AccessStacking Polymorphism in PtSe 2 Drastically Affects Its Electromechanical Properties
Author(s) -
Kempt Roman,
Lukas Sebastian,
Hartwig Oliver,
Prechtl Maximilian,
Kuc Agnieszka,
Brumme Thomas,
Li Sha,
Neumaier Daniel,
Lemme Max C.,
Duesberg Georg S.,
Heine Thomas
Publication year - 2022
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.202201272
Subject(s) - stacking , polymorphism (computer science) , materials science , nanotechnology , crystallography , genetics , chemistry , physics , allele , biology , nuclear magnetic resonance , gene
PtSe 2 is one of the most promising materials for the next generation of piezoresistive sensors. However, the large‐scale synthesis of homogeneous thin films with reproducible electromechanical properties is challenging due to polycrystallinity. It is shown that stacking phases other than the 1T phase become thermodynamically available at elevated temperatures that are common during synthesis. It is shown that these phases can make up a significant fraction in a polycrystalline thin film and discuss methods to characterize them, including their Seebeck coefficients. Lastly, their gauge factors, which vary strongly and heavily impact the performance of a nanoelectromechanical device are estimated.