Postgraduate Thesis: Improvement of polymer solar cells through device design
| Title | Improvement of polymer solar cells through device design |
|---|---|
| Authors | Sun, Yechuan. 孙也川. |
| Issue Date | 2012 |
| Publisher | The University of Hong Kong (Pokfulam, Hong Kong) |
| Abstract | In this thesis, fabrication of polymer solar cells through different device designs is presented and the resulted solar cell performance is discussed. Poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) are chosen as the photoactive layer materials as this material combination has been widely used and well investigated. The known properties of P3HT and PCBM make systematical studies and modeling for the effect of device designs on the performance of polymer solar cells possible although this is beyond the scope of this thesis. First, ITO electrodes were fabricated by sputtering and used as the transparent electrode for polymer solar cells. Properties of ITO film fabricated by different sputtering conditions were compared. Radio frequency (RF) sputtered ITO was found to exhibit the best transparency overall. This condition was further applied to the fabrication of ITO electrode for polymer solar cells with light trapping structures. Low temperature processed silicon oxide (SiOx) / titanium oxide (TiOx) periodic structures were fabricated by sol-gel method. Optical transmittance of the bottom electrode was altered by the presence of the reflective coating and thus the absorption in the photoactive layer was affected. By varying the number of layer pairs and thickness of each layer in the reflective coating, improvement of polymer solar cell performance was found by inserting reflective coating for optimized conditions. Finally, semi-transparent polymer solar cells with inverted structure were demonstrated using conductive polymer as the anode. The process in device preparation was vacuum-free and thus could be potentially useful in large-scale roll-to-roll fabrication. |
| Advisors | Djurisic, A |
| Degree | Master of Philosophy |
| Subject | Solar cells - Design and construction. Conducting polymers. |
| Dept/Program | Physics |
| dc.contributor.advisor | Djurisic, A |
|---|---|
| dc.contributor.author | Sun, Yechuan. |
| dc.contributor.author | 孙也川. |
| dc.date.hkucongregation | 2012 |
| dc.date.issued | 2012 |
| dc.description.abstract | In this thesis, fabrication of polymer solar cells through different device designs is presented and the resulted solar cell performance is discussed. Poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) are chosen as the photoactive layer materials as this material combination has been widely used and well investigated. The known properties of P3HT and PCBM make systematical studies and modeling for the effect of device designs on the performance of polymer solar cells possible although this is beyond the scope of this thesis. First, ITO electrodes were fabricated by sputtering and used as the transparent electrode for polymer solar cells. Properties of ITO film fabricated by different sputtering conditions were compared. Radio frequency (RF) sputtered ITO was found to exhibit the best transparency overall. This condition was further applied to the fabrication of ITO electrode for polymer solar cells with light trapping structures. Low temperature processed silicon oxide (SiOx) / titanium oxide (TiOx) periodic structures were fabricated by sol-gel method. Optical transmittance of the bottom electrode was altered by the presence of the reflective coating and thus the absorption in the photoactive layer was affected. By varying the number of layer pairs and thickness of each layer in the reflective coating, improvement of polymer solar cell performance was found by inserting reflective coating for optimized conditions. Finally, semi-transparent polymer solar cells with inverted structure were demonstrated using conductive polymer as the anode. The process in device preparation was vacuum-free and thus could be potentially useful in large-scale roll-to-roll fabrication. |
| dc.description.nature | published_or_final_version |
| dc.description.thesisdiscipline | Physics |
| dc.description.thesislevel | master's |
| dc.description.thesisname | Master of Philosophy |
| dc.identifier.hkul | b4784994 |
| dc.language | eng |
| dc.publisher | The University of Hong Kong (Pokfulam, Hong Kong) |
| dc.relation.ispartof | HKU Theses Online (HKUTO) |
| dc.rights | The author retains all proprietary rights, (such as patent rights) and the right to use in future works. |
| dc.rights | Creative Commons: Attribution 3.0 Hong Kong License |
| dc.source.uri | http://hub.hku.hk/bib/B47849940 |
| dc.subject.lcsh | Solar cells - Design and construction. |
| dc.subject.lcsh | Conducting polymers. |
| dc.title | Improvement of polymer solar cells through device design |
| dc.type | PG_Thesis |