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Lattice‐Defect‐Induced Piezo Response in Methylammonium‐Lead‐Iodide Perovskite Based Nanogenerator
Author(s) -
Dhar Joydeep,
Sil Sayantan,
Hoque Nur A.,
Dey Arka,
Das Sukhen,
Ray Partha P.,
Sanyal Dirtha
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201801034
Subject(s) - materials science , piezoelectricity , optoelectronics , photovoltaics , perovskite (structure) , semiconductor , spinel , nanogenerator , diode , anode , iodide , nanotechnology , chemical engineering , composite material , photovoltaic system , chemistry , inorganic chemistry , metallurgy , electrical engineering , electrode , engineering
Methylammonium lead iodide (MAPbI 3 ), a hybrid perovskite has become the semiconductor for case studies in several material properties due to its multi‐faceted electronic application. Other than photovoltaics, generation of piezoelectricity from hybrid perovskites has been reported previously, though its origin remained unsubstantiated. In this report, MAPbI 3 with different degrees of crystal defects as determined by positron annihilation spectroscopy are developed through ball‐mill grinding procedure and utilized to fabricate flexible piezoelectric nanogenerators. We have demonstrated that at room temperature the lattice defects play the pivotal role in governing the ionic polarization which in principle governs the piezo‐effect in MAPbI 3 . The best device performance is exhibited by maximum defect containing sample having significant amount of Pb 2+ defects. A device fabricated with 5 wt% PDMS composite produces piezo‐voltage of more than 100 V with a maximum power density of 0.3 mW/cm 3 and can illuminate commercially available 30 blue light emitting diodes.