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Ultrathin CsPbX 3 Nanowire Arrays with Strong Emission Anisotropy
Author(s) -
Gao Yan,
Zhao Liyun,
Shang Qiuyu,
Zhong Yangguang,
Liu Zhen,
Chen Jie,
Zhang Zhepeng,
Shi Jia,
Du Wenna,
Zhang Yanfeng,
Chen Shulin,
Gao Peng,
Liu Xinfeng,
Wang Xina,
Zhang Qing
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.201801805
Subject(s) - materials science , nanowire , anisotropy , nanotechnology , optics , physics
1D nanowires of all‐inorganic lead halide perovskites represent a good architecture for the development of polarization‐sensitive optoelectronic devices due to their high absorption efficient, emission yield, and dielectric constants. However, among as‐fabricated perovskite nanowires with the lateral dimensions of hundreds nanometers so far, the optical anisotropy is hindered and rarely explored owing to the invalidating of electrostatic dielectric mismatch in the physical dimensions. Here, well‐aligned CsPbBr 3 and CsPbCl 3 nanowires with thickness T down to 15 and 7 nm, respectively, are synthesized using a vapor phase van der Waals epitaxial method. Strong emission anisotropy with polarization ratio up to ≈0.78 is demonstrated in the nanowires with T < 40 nm due to the electrostatic dielectric confinement. With the increasing of thickness, the polarization ratio remarkably reduces monotonously to ≈0.17 until T ≈140 nm; and further oscillates in a small amplitude owing to the wave characteristic of light. These findings not only represent a demonstration of perovskite‐based polarization‐sensitive light sources, but also advance fundamental understanding of their polarization properties of perovskite nanowires.