Laser-induced Structural Transformation of Methylammonium Lead Iodide
(2025) KEMR30 20251Department of Chemistry
- Abstract
- Introduction: Phase transition in semiconductor perovskite materials is an interesting phenomenon that is relevant for understanding of properties of these semiconductors.
Background: The challenge in this field lies in understanding the phase transformation mechanisms between different phases in MAPbI3.
Aim(s): To investigate laser-induced structural transformation of methylammonium lead iodide.
Methods used: Plasma Treatment, Spin-Coating, UV-Vis absorption spectra, Scanning Electron Microscopy (SEM), Thin film X-ray diffraction, Time-resolved Photoluminescence (TRPL), Low-temperature cryostat.
Results: At 77K, MAPbI3 exists in the orthorhombic phase (OP) because the material is below the phase transition temperature of 160 K. As the... (More) - Introduction: Phase transition in semiconductor perovskite materials is an interesting phenomenon that is relevant for understanding of properties of these semiconductors.
Background: The challenge in this field lies in understanding the phase transformation mechanisms between different phases in MAPbI3.
Aim(s): To investigate laser-induced structural transformation of methylammonium lead iodide.
Methods used: Plasma Treatment, Spin-Coating, UV-Vis absorption spectra, Scanning Electron Microscopy (SEM), Thin film X-ray diffraction, Time-resolved Photoluminescence (TRPL), Low-temperature cryostat.
Results: At 77K, MAPbI3 exists in the orthorhombic phase (OP) because the material is below the phase transition temperature of 160 K. As the laser fluence increases, another phase emerges, possibly due to heat buildup from the laser. As the fluence rises, the tetragonal phase (TP) becomes more prominent, coexisting with the orthorhombic phase (OP). As the temperature increases, all the material transitions to the tetragonal phase (TP). This describes the phase transition process that occurs in MAPbI3.
Conclusion: There is a laser-induced structural transformation of methylammonium lead iodide at 77K between two different phases, which can be monitored and studied with time-resolved photoluminescence. (Less) - Popular Abstract
- Unlocking the secrets of solar materials
Perovskite materials, particularly methylammonium lead iodide (MAPbI₃), are revolutionizing solar energy thanks to their remarkable light-absorbing ability. However, the internal structure of these materials changes with temperature and even light. In this study, the researchers used lasers to trigger and study these changes. At very low temperatures (77 K), MAPbI₃ normally stabilizes in one structure. However, laser irradiation causes it to partially transform into another structure, similar to what happens when the temperature is increased. This suggests that lasers could be used not only to study the properties of these materials, but also potentially to control them, paving the way for... (More) - Unlocking the secrets of solar materials
Perovskite materials, particularly methylammonium lead iodide (MAPbI₃), are revolutionizing solar energy thanks to their remarkable light-absorbing ability. However, the internal structure of these materials changes with temperature and even light. In this study, the researchers used lasers to trigger and study these changes. At very low temperatures (77 K), MAPbI₃ normally stabilizes in one structure. However, laser irradiation causes it to partially transform into another structure, similar to what happens when the temperature is increased. This suggests that lasers could be used not only to study the properties of these materials, but also potentially to control them, paving the way for smarter, more efficient solar technologies. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/9194922
- author
- Jiao, Chenxu LU
- supervisor
-
- Yong Li LU
- organization
- course
- KEMR30 20251
- year
- 2025
- type
- H2 - Master's Degree (Two Years)
- subject
- keywords
- chemical physics, laser-induced structural transformation, metal-halide perovskite, phase transition, semiconductor, thin film
- language
- English
- id
- 9194922
- date added to LUP
- 2025-06-12 08:49:36
- date last changed
- 2025-06-12 08:49:36
@misc{9194922,
abstract = {{Introduction: Phase transition in semiconductor perovskite materials is an interesting phenomenon that is relevant for understanding of properties of these semiconductors.
Background: The challenge in this field lies in understanding the phase transformation mechanisms between different phases in MAPbI3.
Aim(s): To investigate laser-induced structural transformation of methylammonium lead iodide.
Methods used: Plasma Treatment, Spin-Coating, UV-Vis absorption spectra, Scanning Electron Microscopy (SEM), Thin film X-ray diffraction, Time-resolved Photoluminescence (TRPL), Low-temperature cryostat.
Results: At 77K, MAPbI3 exists in the orthorhombic phase (OP) because the material is below the phase transition temperature of 160 K. As the laser fluence increases, another phase emerges, possibly due to heat buildup from the laser. As the fluence rises, the tetragonal phase (TP) becomes more prominent, coexisting with the orthorhombic phase (OP). As the temperature increases, all the material transitions to the tetragonal phase (TP). This describes the phase transition process that occurs in MAPbI3.
Conclusion: There is a laser-induced structural transformation of methylammonium lead iodide at 77K between two different phases, which can be monitored and studied with time-resolved photoluminescence.}},
author = {{Jiao, Chenxu}},
language = {{eng}},
note = {{Student Paper}},
title = {{Laser-induced Structural Transformation of Methylammonium Lead Iodide}},
year = {{2025}},
}