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Surface Photovoltage Spectroscopy Study of Ultrasonically Sprayed‐Aerosol CH 3 NH 3 PbI 3 Perovskite Crystals
Author(s) -
Henjongchom Nakorn,
Rujisamphan Nopporn,
Tang IMing,
Supasai Thidarat
Publication year - 2018
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201800133
Subject(s) - surface photovoltage , materials science , perovskite (structure) , trihalide , aerosol , band gap , semiconductor , spectroscopy , deposition (geology) , analytical chemistry (journal) , crystallography , optoelectronics , halide , inorganic chemistry , chemistry , organic chemistry , paleontology , physics , quantum mechanics , sediment , biology
A simple deposition process for preparing crystalline semiconductors with low degrees of disorder is of paramount interest for both device applications and research investigations. This study centers on the ultrasonically sprayed‐aerosol based approach for preparing crystals of methylammonium lead trihalide perovskite (CH 3 NH 3 PbI 3 ). The surface photovoltage (SPV) spectra are found to depend strongly on the preparation conditions, with the SPV signals (below the material's band gap) providing information on the defect states. The measured values of tail states near the band gap (E t ) are found to be about 21 and 52 meV for the CH 3 NH 3 PbI 3 crystals prepared by the ultrasonically sprayed‐on and spun casting approaches, respectively.