| 학회 | 한국고분자학회 |
| 학술대회 | 2003년 가을 (10/10 ~ 10/11, 부경대학교) |
| 권호 | 28권 2호, p.48 |
| 발표분야 | 특별 심포지엄 |
| 제목 | Polymer TFT Technology using Rubber Stamp Printing |
| 초록 | Organic based thin film transistors (OTFTs) are now widely studied due to their potential advantages of easy processing, low cost and compatibility with flexible displays. Recently OTFT with pentacene as active material showed even higher mobility than conventional hydrogenated amorphous silicon (a-Si:H) TFT and OTFT LCD panel has been demonstrated. However, despite the advances in the performance of pentacene based OTFTs, high manufacturing cost is a prerequisite since high cost vacuum processes are required to manufacture the organic layer. Also the patterning process could be one of the serious problems when applied to large-area flexible displays since shadow masks are required for making the organic patterns. Solution processable polymer semiconductors, such as Poly (3-hexylthiophene) (P3HT), have gathered much attention recently, due to their relatively high mobility, high stability in air and easy processing. Solution processability enables low cost fabrication processes such as spin coating, dip coating, ink-jet printing and stamp printing method. These processes are compatible with widely used roll-to-roll process and the process temperature is also very low. Because of these reasons they can be easily adopted to flexible display fabrication with polymer substrates. One of the main issues rising in the area of solution processable polymer TFT is the patterning technique for polymer layers. With spin coating and dip coating methods, the polymer solution will cover the entire area and the patterns must be defined by conventional photolithography process, or dry etching with protection layers, such as SiO2 or PTV. Another possibility is using photo-sensible functional polymers but this could be rather difficult work. Ink jet printing method, currently used in polymer light emitting diode devices, is one another possible way to make patterns with very high speed, but the disadvantage of this method is it requires extra layer with patterned wells. Stamp printing method has been studied for making patterns with self-assembled monolayers (SAMs). Printed SAM layer works as photoresist and gold patterns are achieved by etching away gold parts with no SAM patterns. We applied the contact printing method in a different way. Instead of making etching patterns with SAM, semiconducting polymer layer is printed by pre-patterned stamp. The key advantage of this method is no additional process is required after printing the patterns. In this review, fabrication of P3HT TFT arrays on flexible polycarbonate substrates using stamp printing method will be discussed. Also, some investigations and technologies for high performance P3HT TFT LCD with enhanced electrical and mechanical properties are described. |
| 저자 | 문대규 |
| 소속 | KETI |
| 키워드 | Polymer TFT; Rubber Stamp Printing; Flexible Display |
