High-pressure Response in Two-dimensional Perovskites with Fluorinated Organic Spacers

Two-dimensional (2D) Organic-Inorganic halide perovskites (OIHP) have emerged as a potential replacement for its 3D counterpart in perovskite solar cells (PSC) due to its enhanced stability. However, the presence of the large organic spacer cation hinders the charge transport, which lowers the power...

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Main Author: Ong, Brandon Toon Sheng
Other Authors: Shen Zexiang
Format: Final Year Project
Language:English
Published: Nanyang Technological University 2021
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Online Access:https://hdl.handle.net/10356/148576
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spelling sg-ntu-dr.10356-1485762023-02-28T23:18:50Z High-pressure Response in Two-dimensional Perovskites with Fluorinated Organic Spacers Ong, Brandon Toon Sheng Shen Zexiang School of Physical and Mathematical Sciences Yulia Lekina zexiang@ntu.edu.sg YULIA001@e.ntu.edu.sg Science::Physics Two-dimensional (2D) Organic-Inorganic halide perovskites (OIHP) have emerged as a potential replacement for its 3D counterpart in perovskite solar cells (PSC) due to its enhanced stability. However, the presence of the large organic spacer cation hinders the charge transport, which lowers the power conversion efficiency in 2D OIHP. A fluorine organic spacer, obtained by substituting a fluorine atom with a hydrogen atom in the benzene ring, has provided a solution by enhancing orbital interactions and charge transport within the inorganic layers and applying external pressure on the perovskite has shown to alter its structural and optoelectronic properties. These two areas have generated great interest as they could potentially create a new approach to dive deeper and generate a better understanding of the properties of 2D OIHP. However, these two areas have never been reported together. In this report, we demonstrated applying high pressure causes a significant bandgap narrowing in both perovskites. When a fluorine atom is substituted in (PEA)2PbI4, the intermolecular bonds between each molecule are stronger than without the presence of the fluorinated organic cation under the same pressure conditions for both the organic and inorganic framework of the perovskite. However, we also showcase that this substitution process does not significantly affect the bandgap of the perovskite. Bachelor of Science in Physics 2021-05-06T07:11:04Z 2021-05-06T07:11:04Z 2021 Final Year Project (FYP) Ong, B. T. S. (2021). High-pressure Response in Two-dimensional Perovskites with Fluorinated Organic Spacers. Final Year Project (FYP), Nanyang Technological University, Singapore. https://hdl.handle.net/10356/148576 https://hdl.handle.net/10356/148576 en application/pdf Nanyang Technological University
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Science::Physics
spellingShingle Science::Physics
Ong, Brandon Toon Sheng
High-pressure Response in Two-dimensional Perovskites with Fluorinated Organic Spacers
description Two-dimensional (2D) Organic-Inorganic halide perovskites (OIHP) have emerged as a potential replacement for its 3D counterpart in perovskite solar cells (PSC) due to its enhanced stability. However, the presence of the large organic spacer cation hinders the charge transport, which lowers the power conversion efficiency in 2D OIHP. A fluorine organic spacer, obtained by substituting a fluorine atom with a hydrogen atom in the benzene ring, has provided a solution by enhancing orbital interactions and charge transport within the inorganic layers and applying external pressure on the perovskite has shown to alter its structural and optoelectronic properties. These two areas have generated great interest as they could potentially create a new approach to dive deeper and generate a better understanding of the properties of 2D OIHP. However, these two areas have never been reported together. In this report, we demonstrated applying high pressure causes a significant bandgap narrowing in both perovskites. When a fluorine atom is substituted in (PEA)2PbI4, the intermolecular bonds between each molecule are stronger than without the presence of the fluorinated organic cation under the same pressure conditions for both the organic and inorganic framework of the perovskite. However, we also showcase that this substitution process does not significantly affect the bandgap of the perovskite.
author2 Shen Zexiang
author_facet Shen Zexiang
Ong, Brandon Toon Sheng
format Final Year Project
author Ong, Brandon Toon Sheng
author_sort Ong, Brandon Toon Sheng
title High-pressure Response in Two-dimensional Perovskites with Fluorinated Organic Spacers
title_short High-pressure Response in Two-dimensional Perovskites with Fluorinated Organic Spacers
title_full High-pressure Response in Two-dimensional Perovskites with Fluorinated Organic Spacers
title_fullStr High-pressure Response in Two-dimensional Perovskites with Fluorinated Organic Spacers
title_full_unstemmed High-pressure Response in Two-dimensional Perovskites with Fluorinated Organic Spacers
title_sort high-pressure response in two-dimensional perovskites with fluorinated organic spacers
publisher Nanyang Technological University
publishDate 2021
url https://hdl.handle.net/10356/148576
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