Title:
Impact of process parameter modification on poly(3-hexylthiophene) film morphology and charge transport
Impact of process parameter modification on poly(3-hexylthiophene) film morphology and charge transport
| dc.contributor.advisor | Reichmanis, Elsa | |
| dc.contributor.author | Lee, Jiho | |
| dc.contributor.committeeMember | Deng, Yulin | |
| dc.contributor.committeeMember | Hess, Dennis W. | |
| dc.contributor.committeeMember | Koros, William J. | |
| dc.contributor.department | Chemical and Biomolecular Engineering | |
| dc.date.accessioned | 2014-01-13T16:53:46Z | |
| dc.date.available | 2014-01-13T16:53:46Z | |
| dc.date.created | 2013-12 | |
| dc.date.issued | 2013-11-21 | |
| dc.date.submitted | December 2013 | |
| dc.date.updated | 2014-01-13T16:53:46Z | |
| dc.description.abstract | Organic electronics based on π-conjugated semi-conductor raises new technology, such as organic film transistors, e-paper, and organic photovoltaic cells that can be implemented cost-effectively on large-area applications. Currently, the device performance is limited by low charge carrier mobility. Poly(3-hexylthiophene) (P3HT) and organic field effect transistors (OFET) is used as a model to investigate morphology of the organic film and corresponding electronic properties. In this thesis, processing parameters such as boiling points and solubility are controlled to impact the micro- and macro-morphology of the film to enhance the charge transport of the device. Alternative approach to improve ordering of polymer chains and increase in charge transport without post-treatment of P3HT solution is studied. The addition of high boiling good solvent to the relatively low boiling main solvent forms ordered packing of π-conjugated polymers during the deposition process. We show that addition of 1% of dichlorobenzene (DCB) to the chloroform based P3HT solution was sufficient to improve wetting and molecular structures of the film to increase carrier mobility. Systematic study of solvent-assisted re-annealing technique, which has potential application in OFET encapsulation and fabrication of top-contact OFET, is conducted to improve mobility of OFET, and, to suggest a cost-effective processing condition suitable for industrial application. Three process parameters: boiling point, polarity, and solubility are investigated to further understand the trend of film response to the solvent-assisted technique. We report the high boiling non-polar solvents with relatively high RED values promote highest improvement in molecular packing and formulate crystalline structure of the thin film, which increases the device performance. | |
| dc.description.degree | M.S. | |
| dc.format.mimetype | application/pdf | |
| dc.identifier.uri | http://hdl.handle.net/1853/50409 | |
| dc.language.iso | en_US | |
| dc.publisher | Georgia Institute of Technology | |
| dc.subject | Organic field-effect transistor (OFET) | |
| dc.subject | Poly(3-hexylthiophene) | |
| dc.subject | Hansen solubility parameter | |
| dc.subject | Volatility difference solvent-assisted method | |
| dc.subject.lcsh | Organic electronics | |
| dc.subject.lcsh | Organic field-effect transistors | |
| dc.subject.lcsh | Microstructure | |
| dc.subject.lcsh | Thin films | |
| dc.title | Impact of process parameter modification on poly(3-hexylthiophene) film morphology and charge transport | |
| dc.type | Text | |
| dc.type.genre | Thesis | |
| dspace.entity.type | Publication | |
| local.contributor.advisor | Reichmanis, Elsa | |
| local.contributor.corporatename | School of Chemical and Biomolecular Engineering | |
| local.contributor.corporatename | College of Engineering | |
| relation.isAdvisorOfPublication | 5fd5aafd-b255-4fbe-a749-89032de935cb | |
| relation.isOrgUnitOfPublication | 6cfa2dc6-c5bf-4f6b-99a2-57105d8f7a6f | |
| relation.isOrgUnitOfPublication | 7c022d60-21d5-497c-b552-95e489a06569 | |
| thesis.degree.level | Masters |