10.1021/acs.jpcc.8b00602.s004
Sharada Govinda
Sharada
Govinda
Bhushan P. Kore
Bhushan P.
Kore
Diptikanta Swain
Diptikanta
Swain
Akmal Hossain
Akmal
Hossain
Chandan De
Chandan
De
Tayur N. Guru Row
Tayur
N. Guru Row
D. D. Sarma
D. D.
Sarma
Critical Comparison of FAPbX<sub>3</sub> and MAPbX<sub>3</sub> (X
= Br and Cl): How Do They Differ?
American Chemical Society
2018
FA compounds
dielectric constants
temperature-dependent single-crystal X-ray diffraction
XRD
MAPbX 3 system
temperature dependence
temperature range
2018-02-23 00:00:00
Dataset
https://acs.figshare.com/articles/dataset/Critical_Comparison_of_FAPbX_sub_3_sub_and_MAPbX_sub_3_sub_X_Br_and_Cl_How_Do_They_Differ_/5965147
Dielectric
measurements on formamidinium lead halide perovskites,
FAPbCl<sub>3</sub> and FAPbBr<sub>3</sub>, compared to those of MAPbCl<sub>3</sub> and previously reported MAPbBr<sub>3</sub>, reveal the strongly
suppressed temperature dependence of dielectric constants in FA compounds
in the temperature range of approximately 140–300 K. Although
the behavior of dielectric constants of FA compounds for temperatures
<140 K resembles that of the MAPbX<sub>3</sub> system, the absence
of any strong temperature dependence in sharp contrast to MA analogues
in the higher temperature range up to room temperature suggests that
the formamidinium (FA) dipoles are in a deep-frozen glassy state unlike
the MA dipoles that rotate nearly freely in the temperature range
relevant for any photovoltaic application. This observation is further
supported by the temperature-dependent single-crystal X-ray diffraction
(XRD) results.