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Large‐Scale Production of Bismuth Chalcogenide and Graphene Heterostructure and Its Application for Flexible Broadband Photodetector
Author(s) -
Song Jingchao,
Yuan Jian,
Xia Fang,
Liu Jingying,
Zhang Yupeng,
Zhong Yu Lin,
Zheng Jialu,
Liu Yan,
Li Shaojuan,
Zhao Meng,
Tian Zhiming,
Caruso Rachel A.,
Loh Kian Ping,
Bao Qiaoliang
Publication year - 2016
Publication title -
advanced electronic materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.25
H-Index - 56
ISSN - 2199-160X
DOI - 10.1002/aelm.201600077
Subject(s) - materials science , heterojunction , graphene , chalcogenide , photodetector , optoelectronics , van der waals force , x ray photoelectron spectroscopy , nanotechnology , bismuth , chemical engineering , chemistry , organic chemistry , molecule , engineering , metallurgy
Large‐scale production of 2D van der Waals heterostructures with precisely controlled chemical composition is the major challenge hindering their practical electric and optoelectronic applications. In this work, a solvothermal method is demonstrated to produce van der Waals heterostructures consisting of metal chalcogenides and graphene in a large scale. In situ powder X‐ray diffraction reveals that graphene plays an important role as atomic template to grow bismuth chalcogenide nanoplatelets with preferential stoichiometry of Bi 2 Se 1.5 Te 1.5 , which is naturally unstable. It is found that Bi 2 Se 1.5 Te 1.5 has the minimum lattice mismatch with graphene (<0.1%). The release of lattice mismatch strain between Bi 2 Se 1.5 Te 1.5 and graphene sheet is evidenced by a new peak in the ultraviolet photoelectron spectroscopy. A macroscale free‐standing heterostructured thin film with excellent mechanical flexibility is fabricated by simply filtering the large‐scale solution processed heterostructure. The heterostructure film is used to fabricate a flexible photodetector, which shows a broadband photo response and excellent durability in a bending test. The heterostructure material and device demonstrated in this work may shed light to flexible optoelectronic devices and applications.