Discotic liquid crystal is one kind of self-assembled material, liquid crystal with regular alignment could be applied to many kinds of organic electro-optical devices. This novel discotic liquid crystal polymer DLC-PAM, we used polyacrylamide(PAM) as main chain of the novel discotic liquid crystal polymer DLC-PAM and grafted the discotic liquid crystal monomer Acid-6 onto PAM by chemical synthesis. There were two parts in this study, first we investigated the electro-optical properties of DLC-PAM. Observation the aligned property of DLC-PAM during temperature variation utilizing polarizing optical microscope, DLC-PAM exhibited the columnar alignment. We observed hexagonal columns which DLC-PAM aligned by X-ray diffraction, it benefited the carrier transporting. The absorption spectrum of DLC-PAM presented an absorption peak at 409 nm certifying that DLC-PAM could absorb the visible light. We measured the HOMO potential of DLC-PAM which is 5.47eV by PESA. Form absorption spectrum we calculated the band-gap of DLC-PAM which was 2.55~2.82eV, and then we used the HOMO potential and the band-gap to calculate the LUMO potential of DLC-PAM to be 2.65~2.92eV.
The second part in this study we applied DLC-PAM to the organic solar cell. Because of the energy level of DLC-PAM and the different device structure tests we realized that DLC-PAM was suitable to be hole transporting layer. The device structure we used was ITO/PEDOT:PSS/DLC-PAM/P3HT:PCBM/Al, DLC-PAM layer was added between the PEDOT:PSS layer and the active layer. The power conversion efficiencies proved that DLC-PAM layer which benefited hole transporting raising the power conversion efficiency of the solar cell. The power efficiency of the device added DLC-PAM layer raised 16.2% comparing with the standard device.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0725108-180336 |
| Date | 25 July 2008 |
| Creators | Chueh, Yu-hung |
| Contributors | Ping-Tsung Huang, Ann-Kuo Chu, Yu-Kai Han, Mei-Ying Chang, Wen-Yao Huang |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0725108-180336 |
| Rights | not_available, Copyright information available at source archive |
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