Self-assembly of polymers and small molecules for photovoltaics application

Solar energy is one of the most promising energy sources of the future with depleting amount of fossil fuels, and organic photovoltaic (OPV) is among the cheapest in terms of materials and processing methods. However, the performance of OPV is largely dependent on the morphology of the photoactive l...

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Main Author: Hong, Zijie.
Other Authors: Lam Yeng Ming
Format: Final Year Project
Language:English
Published: 2010
Subjects:
Online Access:http://hdl.handle.net/10356/36174
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-361742023-03-04T15:38:04Z Self-assembly of polymers and small molecules for photovoltaics application Hong, Zijie. Lam Yeng Ming School of Materials Science and Engineering DRNTU::Engineering Solar energy is one of the most promising energy sources of the future with depleting amount of fossil fuels, and organic photovoltaic (OPV) is among the cheapest in terms of materials and processing methods. However, the performance of OPV is largely dependent on the morphology of the photoactive layer. In this project, morphological control of the photoactive layer has being achieved for P3HT polymer and PTCDI-C13H27 small molecule with the addition of poor solvent. Upon introduction of poor solvent, favorable π-stacking can be induced from the changes in solubility to create one-dimensional (1-D) structure with enhanced crystallinity. Using this approach, P3HT nanofibers were constructed and devices based on this P3HT:PCBM blend obtained an increment in PCE from 0.9% to 2.3% without any post production treatment such as thermal annealing. In addition, different dimensions of PTCDI 1-D structure were also obtained using different methods of poor solvent addition. By controlling the amount of nucleation sites created and the subsequence interactions at each site, the width and length of the PTCDI 1-D structure can be controlled. The width of the PTCDI-C13H27 structures range from 20 μm to 70 nm with length ranging from 0.1 cm to 2 μm. Bachelor of Engineering (Materials Engineering) 2010-04-23T03:49:27Z 2010-04-23T03:49:27Z 2010 2010 Final Year Project (FYP) http://hdl.handle.net/10356/36174 en Nanyang Technological University 58 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering
spellingShingle DRNTU::Engineering
Hong, Zijie.
Self-assembly of polymers and small molecules for photovoltaics application
description Solar energy is one of the most promising energy sources of the future with depleting amount of fossil fuels, and organic photovoltaic (OPV) is among the cheapest in terms of materials and processing methods. However, the performance of OPV is largely dependent on the morphology of the photoactive layer. In this project, morphological control of the photoactive layer has being achieved for P3HT polymer and PTCDI-C13H27 small molecule with the addition of poor solvent. Upon introduction of poor solvent, favorable π-stacking can be induced from the changes in solubility to create one-dimensional (1-D) structure with enhanced crystallinity. Using this approach, P3HT nanofibers were constructed and devices based on this P3HT:PCBM blend obtained an increment in PCE from 0.9% to 2.3% without any post production treatment such as thermal annealing. In addition, different dimensions of PTCDI 1-D structure were also obtained using different methods of poor solvent addition. By controlling the amount of nucleation sites created and the subsequence interactions at each site, the width and length of the PTCDI 1-D structure can be controlled. The width of the PTCDI-C13H27 structures range from 20 μm to 70 nm with length ranging from 0.1 cm to 2 μm.
author2 Lam Yeng Ming
author_facet Lam Yeng Ming
Hong, Zijie.
format Final Year Project
author Hong, Zijie.
author_sort Hong, Zijie.
title Self-assembly of polymers and small molecules for photovoltaics application
title_short Self-assembly of polymers and small molecules for photovoltaics application
title_full Self-assembly of polymers and small molecules for photovoltaics application
title_fullStr Self-assembly of polymers and small molecules for photovoltaics application
title_full_unstemmed Self-assembly of polymers and small molecules for photovoltaics application
title_sort self-assembly of polymers and small molecules for photovoltaics application
publishDate 2010
url http://hdl.handle.net/10356/36174
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