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Orientation Engineering in Low‐Dimensional Crystal‐Structural Materials via Seed Screening
Author(s) -
Li Kanghua,
Chen Chao,
Lu Shuaicheng,
Wang Chong,
Wang Siyu,
Lu Yue,
Tang Jiang
Publication year - 2019
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.201903914
Subject(s) - materials science , substrate (aquarium) , perpendicular , orientation (vector space) , van der waals force , inert , optoelectronics , crystal (programming language) , diode , nanotechnology , crystallography , composite material , geometry , molecule , chemistry , organic chemistry , oceanography , mathematics , computer science , programming language , geology
The orientation of low‐dimensional crystal‐structural (LDCS) films significantly affects the performance of photoelectric devices, particularly in vertical conducting devices such as solar cells and light‐emitting diodes. According to film growth theory, the initial seeds determine the final orientation of the film. Ruled by the minimum energy principle, lying (chains or layers parallel to the substrate) seeds bonding with the substrate through van der Waals forces are easier to form than standing (chains or layers perpendicular to the substrate) seeds bonding with the substrate by a covalent bond. Utilizing high substrate temperature to re‐evaporate the lying seeds and preserve the standing seeds, the orientation of 1D crystal‐structural Sb 2 Se 3 is successfully controlled. Guided by this seed screening model, highly [211]‐ and [221]‐oriented Sb 2 Se 3 films on an inert TiO 2 substrate are obtained; consequently, a record efficiency of 7.62% in TiO 2 /Sb 2 Se 3 solar cells is achieved. This universal model of seed screening provides an effective method for orientation control of other LDCS films.