Computational exploration and screening of novel Janus MA2Z4 (M = Sc–Zn, Y–Ag, Hf–Au;A=Si, Ge;Z=N, P) monolayers and potential application as a photocatalyst  

作　　者：Weibin Zhang Woochul Yang Yingkai Liu Zhiyong Liu Fuchun Zhang 

机构地区：[1]College of Physics and Electronics Information,Yunnan Key Laboratory of Opto-Electronic Information Technology,Key Laboratory of Advanced Technique&Preparation for Renewable Energy Materials-Ministry of Education,Yunnan Normal University,Kunming 650500,China [2]College of Physics and Electronic Information,Yan’an University,Yan’an 716000,China [3]Department of Physics,Dongguk University,Seoul 04620,Republic of Korea

出　　处：《Frontiers of physics》2022年第6期51-61,共11页物理学前沿（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.52262042);the Starting Funds for High-level Talents from Yunnan Normal University.

摘　　要：By high-throughput calculations,13 thermally and environmentally stable Janus MA_(2)Z_(4) monolayers were screened from 104 types of candidates.The 13 stable monolayers have very high charge carrier concentrations(×10^(15) cm^(–2)),which are better than those of the well-known graphene and TaS_(2).Because of their excellent conductivity,the 6 monolayers with band gaps less than 0.5 eV are identified as potential electrode materials for hydrogen evolution reaction applications.For potential applications as photoelectric or photocatalytic materials,bandgaps(Eg-HSE)higher than 0.5 eV remained,which resulted in 7 potential candidates.Based on optical absorption analysis in the visible-light range,H-HfSiGeP_(4) and HMoSiGeP_(4) have higher absorption ability and optical conductivity,which is quite impressive for optoelectronic,solar cell device,and photocatalysis applications.Additionally,the transmittance coefficient of Janus MA_(2)Z_(4) monolayers is approximately 70%–80%in the visible-light range,which implies that these monolayers show good light transmittance.For potential applications as photocatalysts,the redox potential and charge effective mass analysis indicate that H-HfSiGeP_(4),HMoSiGeP_(4),T-ScSiGeN_(4),and T-ZrSiGeN_(4) are suitable photocatalysts for CO_(2) reduction reactions.Using high-throughput identification,13 types of new and stable Janus MA2Z4 monolayers were explored,and the basic properties and potential applications were investigated,which can reduce the time for experiments and provide basic data for the material genome initiative.

关 键 词：Janus MA2Z4 high-throughput identification charge carrier concentration electronic structure optical properties 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学]