Premium
Density functional theory insight into metal ions and vacancies for improved performance in storage devices
Author(s) -
Resheed Umbreen,
Alsuwian Turki,
Imran Muhammad,
Algadi Hassan,
Khera Ejaz Ahmad,
Khalil R. M. Arif,
Mahata Chandreswar,
Hussain Fayyaz
Publication year - 2021
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.6572
Subject(s) - dopant , density functional theory , materials science , doping , band gap , vacancy defect , chemical physics , ion , atom (system on chip) , resistive random access memory , conductivity , fermi level , condensed matter physics , nanotechnology , optoelectronics , computational chemistry , chemistry , electrode , electron , physics , organic chemistry , computer science , embedded system , quantum mechanics
Summary Metal ions and oxygen vacancies (V o ) in resistive switching (RS) material play a crucial role in nonvolatile low power consuming memory devices. Performed first principle calculations investigate the impact of Cu dopant as well as collective effect of Cu + V o on cubic ATiO 3 (A = Ba, Be and Mg). Utilization of GGA + U for including coulombic effect with nonlocal exchange and exchange correlation functional has made the results more accurate. Structural properties, defect states formation in the bandgap region, and formation energy have been studied. Orbital contributions of each atom in valance band and conduction band region have been determined to explore the influence of Cu doping and Cu + V o on electronic properties of optimized ATiO 3 . Among the studied materials, BeTiCuO 3 + V o is found to have least oxygen vacancy formation energy (E OVFE ) and highest conductivity. The clustering of V o around the dopant is noted, which leads to the formation of conducting filaments (CFs). These CFs play pivotal role in switching mechanism for low potential RRAM and allied devices.