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Growth and Characterization of Radiation Sensors Based on Single Crystals of Hybrid Metal–Organic Methylammonium Lead Bromide and Iodide Perovskite
Author(s) -
Murgulov Valeria,
Daub Michael,
Hillebrecht Harald,
Fiederle Michael,
Franc Jan,
Dědič Václav
Publication year - 2020
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.202000112
Subject(s) - perovskite (structure) , materials science , analytical chemistry (journal) , tetragonal crystal system , single crystal , bromide , electrical resistivity and conductivity , iodide , crystal growth , halide , chemistry , crystallography , crystal structure , inorganic chemistry , chromatography , electrical engineering , engineering
The inverse temperature (T)‐dependent methods yield single crystals of methylammonium lead halide perovskite with strained lattices. In contrast, the antisolvent diffusion method (antisolvent‐vapor crystallization (AVC)) produces unstrained MAPbBr 3 crystals with more uniform growth features and lower density of defects. The powder X‐ray diffraction (XRD) measurements confirm the cubic and the tetragonal structure of the MAPbBr 3 and the MAPbI 3 samples, respectively. The XRD pole figure measurements (MAPbBr 3 ) reveal a roughly parallel dominant (100) lattice plane to the sample surface. An optimal crystal growth combines growth of a seed on an oriented substrate by the AVC method followed by either the AVC or a T‐dependent method. The estimated resistivity ρ and the density of trap state n trap values for the MAPbI 3 samples are 10 7 Ωcm and 10 10 cm −3 , respectively. The X‐ray detection test reveals promising electrical properties of the MAPbI 3 material. Results from the Hall measurements in van der Pauw geometry for the MAPbBr 3 samples agree with those in the literature: the charge‐carrier concentration of 10 9 −10 10 cm −3 and the mobility of 7–289 cm 2 V −1 s −1 , n trap of 10 9 −10 10 cm −3 , and ρ of 10 7 –10 8 Ωcm. These electrical parameters indicate that the MAPbBr 3 samples satisfy requirements for radiation sensors.