Open AccessThe effects of substrate temperature and oxygen pressure on the crystal strcture and transport properties of Bi2Sr2Co2Oy thermoelectric films deposited by pulsed laser deposition
Author(s) -
Shufang Wang,
Shanshan Chen,
Jing-Chun Chen,
Yan Guo-Ying,
Qiao Xiao-Qi,
Fuqiang Liu,
Jianglong Wang,
Ding Xue-Cheng,
Guangsheng Fu
Publication year - 2012
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.61.066804
Subject(s) - materials science , seebeck coefficient , pulsed laser deposition , thermoelectric effect , substrate (aquarium) , electrical resistivity and conductivity , crystal (programming language) , single crystal , deposition (geology) , analytical chemistry (journal) , oxygen , optoelectronics , laser , partial pressure , thin film , nanotechnology , optics , composite material , thermal conductivity , crystallography , chemistry , thermodynamics , electrical engineering , oceanography , computer science , chromatography , programming language , physics , geology , engineering , biology , paleontology , organic chemistry , sediment
We fabricate Bi2Sr2Co2Oy films on c-Al2O3 by pulsed laser deposition and investigate the effects of substrate temperature and oxygen pressure on the crystal stucture and the transport properties of the films. The resulting single phase c-axis Bi2Sr2Co2Oy films obtained under the optimal condition have a room temperature resistivity of about 2.9 m/cm and a seebeck coefficient of 110 V/K, leading to a larger power factor than that of the single crystal. In addition, a negative magnetroresistance of 40% at 2K and 9T is observed in the films.