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Homojunction of Oxygen and Titanium Vacancies and its Interfacial n–p Effect
Author(s) -
Wu SiMing,
Liu XiaoLong,
Lian XiLiang,
Tian Ge,
Janiak Christoph,
Zhang YueXing,
Lu Yi,
Yu HaoZheng,
Hu Jie,
Wei Hao,
Zhao Heng,
Chang GangGang,
Tendeloo Gustaaf,
Wang LiYing,
Yang XiaoYu,
Su BaoLian
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201802173
Subject(s) - homojunction , materials science , titanium , amorphous solid , anatase , oxygen , crystallite , heterojunction , electron paramagnetic resonance , chemical engineering , nanotechnology , photocatalysis , chemical physics , crystallography , optoelectronics , catalysis , nuclear magnetic resonance , metallurgy , biochemistry , chemistry , physics , organic chemistry , engineering
The homojunction of oxygen/metal vacancies and its interfacial n–p effect on the physiochemical properties are rarely reported. Interfacial n–p homojunctions of TiO 2 are fabricated by directly decorating interfacial p‐type titanium‐defected TiO 2 around n‐type oxygen‐defected TiO 2 nanocrystals in amorphous–anatase homogeneous nanostructures. Experimental measurements and theoretical calculations on the cell lattice parameters show that the homojunction of oxygen and titanium vacancies changes the charge density of TiO 2 ; a strong EPR signal caused by oxygen vacancies and an unreported strong titanium vacancies signal of 2D 1 H TQ‐SQ MAS NMR are present. Amorphous–anatase TiO 2 shows significant performance regarding the photogeneration current, photocatalysis, and energy storage, owing to interfacial n‐type to p‐type conductivity with high charge mobility and less structural confinement of amorphous clusters. A new “homojunction of oxygen and titanium vacancies” concept, characteristics, and mechanism are proposed at an atomic‐/nanoscale to clarify the generation of oxygen vacancies and titanium vacancies as well as the interface electron transfer.