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Growth of Ultraflat PbI 2 Nanoflakes by Solvent Evaporation Suppression for High‐Performance UV Photodetectors
Author(s) -
Xiao Han,
Liang Tao,
Xu Mingsheng
Publication year - 2019
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201901767
Subject(s) - photodetector , photodetection , materials science , quantum efficiency , optoelectronics , evaporation , physics , thermodynamics
2D lead iodide (PbI 2 ) is attracting great interest due to its great potential in the application of UV photodetectors. In this work, a facile solution‐based method is developed to synthesize ultraflat PbI 2 nanoflakes for high‐performance UV photodetectors. By maintaining at proximate room temperature and adding an evaporation suppression solvent for slow‐rate crystal growth, high‐quality PbI 2 nanoflakes with an ultraflat surface are obtained. The UV photodetectors based on 2D PbI 2 nanoflakes exhibit a high photoresponsivity of 0.51 A W −1 , a high detectivity of 4.0 × 10 10 Jones, a high external quantum efficiency (EQE) of 168.9%, and a rapid response speed including a rise time of 14.1 ms and a decay time of 31.0 ms. The balanced and excellent photodetector performance of these devices paves the road for practical UV photodetection based on 2D PbI 2 nanoflakes.