TY - JOUR
T1 - Stabilization of 3-D trigonal phase in guanidinium (C(NH2)3) lead triiodide (GAPbI3) films
AU - Kim, Younghoon
AU - Nandi, Pronoy
AU - Lee, Donghwa
AU - Shin, Hyunjung
N1 - Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2021/3/15
Y1 - 2021/3/15
N2 - An understanding of the phase transition in organic-inorganic hybrid perovskites is quite important. These phase transitions have been widely studied as they induce differences in structural, electronic, and optical properties. Thermochromic perovskite materials, which alter their optical bandgap in response to a change in temperature, have shown their potential in smart photovoltaic window applications by utilizing the structural phase transitions of inorganic halide perovskites. Here, we investigated the thermochromic properties of guanidinium (C(NH2)3) lead triiodide (GAPbI3) which shows a reversible crystallographic phase transition between a transparent orthorhombic phase (Pna21) (<160 °C) and a yellow-colored trigonal phase (R3¯m) (>160 °C). The thermal behavior, crystallographic information, and optical and electronic properties of GAPbI3 in these two phases were also investigated. We are the first to report that an atomic layer deposition (ALD)-grown SnO2 passivation layer deposited on top of the perovskite layer can successfully stabilize trigonal-phase of GAPbI3 for 14 h. Furthermore, in the GAPbI3 photodetector device, the on/off photoswitching property was greatly enhanced through thermochromism.
AB - An understanding of the phase transition in organic-inorganic hybrid perovskites is quite important. These phase transitions have been widely studied as they induce differences in structural, electronic, and optical properties. Thermochromic perovskite materials, which alter their optical bandgap in response to a change in temperature, have shown their potential in smart photovoltaic window applications by utilizing the structural phase transitions of inorganic halide perovskites. Here, we investigated the thermochromic properties of guanidinium (C(NH2)3) lead triiodide (GAPbI3) which shows a reversible crystallographic phase transition between a transparent orthorhombic phase (Pna21) (<160 °C) and a yellow-colored trigonal phase (R3¯m) (>160 °C). The thermal behavior, crystallographic information, and optical and electronic properties of GAPbI3 in these two phases were also investigated. We are the first to report that an atomic layer deposition (ALD)-grown SnO2 passivation layer deposited on top of the perovskite layer can successfully stabilize trigonal-phase of GAPbI3 for 14 h. Furthermore, in the GAPbI3 photodetector device, the on/off photoswitching property was greatly enhanced through thermochromism.
KW - Atomic layer deposition
KW - Guanidinium triiodide
KW - Phase stabilization
KW - Photodetector
KW - Thermochromic
UR - http://www.scopus.com/inward/record.url?scp=85097651090&partnerID=8YFLogxK
U2 - 10.1016/j.apsusc.2020.148575
DO - 10.1016/j.apsusc.2020.148575
M3 - Article
AN - SCOPUS:85097651090
SN - 0169-4332
VL - 542
JO - Applied Surface Science
JF - Applied Surface Science
M1 - 148575
ER -