The Fabrication of Poly(3-octylthiophene) / Carbon Nanotubes Nano-Composite and Photovoltaic Device Application
Date Issued
2006
Date
2006
Author(s)
Lin, Ben-son
DOI
zh-TW
Abstract
In this thesis, the engineering part of the solar cell of spin coating, annealing and composite fabrication were studied. In theory, the direct growth aligned carbon nanotubes and P3OT can be fabricated into the composite and have high solar energy conversion efficiency, the direct growth carbon nanotubes can serve as conducting channel to extract electron out of the composite. However, this kind of structure’s fabrication shows high difficulty in engineering aspect. The poor coverage of the P3OT on carbon nanotubes indicates that there exists interface problem between the carbon nanotubes and P3OT.
First, we have to make sure what the important parameter determines the polymer solar cell’s efficiency. After investigating the spin coating rate influence, we found that the spin rate only affect the P3OT’s thickness.
Second, we study the annealing effect on the P3OT’s structure. The amorphous conducting polymer needs to become crystallized that polymer’s application on electronics can become possible. We characterize the structure by absorption spectrum, photoluminescence spectrum, X-ray diffraction. And found the ordering’s evidence in the spectrum: Absorption spectrum’s peak splitting, PL spectrum’s Huang-Rhys Factor decreases as annealing temperature increases, this phenomenon shows that effective conjugation length of the polymer chain increases. X-ray’s results shows that the d-spacing of the polymer decreases, shows that the packing of the structure become denser.
Finally, we study the P3OT / Direct Growth Aligned Carbon Nanotubes composite fabrication. Applying length controlled and density controlled carbon nanotubes on this structure and using surface modification technique to increase the hydrophilicity of the carbon nanotbes surface in order to overcome the interface coverage problem. The electric properties of the composite has been characterized.
Subjects
聚三辛基塞吩
光伏電池
奈米碳管
退火
表面改質
poly (3-octylthiophene)
photovoltaic cell
carbon nanotubes
annealing
surface modification
SDGs
Type
thesis
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