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Flexible Linearly Polarized Photodetectors Based on All‐Inorganic Perovskite CsPbI 3 Nanowires
Author(s) -
Zhou Ying,
Luo Jiajun,
Zhao Yang,
Ge Cong,
Wang Chong,
Gao Liang,
Zhang Cheng,
Hu Manchen,
Niu Guangda,
Tang Jiang
Publication year - 2018
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201800679
Subject(s) - photodetection , photodetector , materials science , photocurrent , anisotropy , nanowire , optoelectronics , polarization (electrochemistry) , optics , physics , chemistry
Polarization‐sensitive photodetection has drawn a great deal of research interests, which takes advantage of anisotropy from the lattice structure or the morphology of active material. However, no photodetectors combined these two kinds of anisotropy together for linearly polarized photodetection. Here, a photodetector based on cesium lead iodide (β‐CsPbI 3 ) nanowire array with anisotropic crystal structure is demonstrated. Owing to the crystal structure and morphology anisotropy of the β‐CsPbI 3 nanowires, the device exhibited high sensitivity to linearly polarized light with a photocurrent anisotropy ratio of 2.68 and 2.17 on rigid and flexible substrates, respectively, which was much higher than existing linearly polarized photodetectors. In addition, the photocurrent anisotropy ratio of the device on flexible substrate only dropped by 5% after 500 bending cycles, indicating excellent flexibility and folding endurance of flexible CsPbI 3 device. The application of anisotropic CsPbI 3 nanowires in polarization‐sensitive photodetection might provide new functionalities in novel optoelectronic applications.