대면적 UV 임프린팅 공정에서 잔류층 두께 예측Prediction of Residual Layer Thickness of Large-area UV Imprinting Process
- Other Titles
- Prediction of Residual Layer Thickness of Large-area UV Imprinting Process
- Authors
- 김국원
- Issue Date
- 2013
- Publisher
- 한국반도체디스플레이기술학회
- Keywords
- UV Nanoimprint Lithography; Rolling Type Imprinting Process; Rubber Roller; Residual Layer Thickness
- Citation
- 반도체디스플레이기술학회지, v.12, no.2, pp.79 - 84
- Journal Title
- 반도체디스플레이기술학회지
- Volume
- 12
- Number
- 2
- Start Page
- 79
- End Page
- 84
- URI
- https://scholarworks.bwise.kr/sch/handle/2021.sw.sch/14372
- ISSN
- 1738-2270
- Abstract
- Nanoimprint lithography (NIL) is the next generation photolithography process in which the photoresist is dispensed onto the substrate in its liquid form and then imprinted and cured into a desired pattern instead of using traditional optical system. There have been considerable attentions on NIL due to its potential abilities that enable cost-effective and high-throughput nanofabrication to the display device and semiconductor industry. Although one of the current major research trends of NIL is large-area patterning, the technical difficulties to keep the uniformity of the residual layer become severer as the imprinting area increases more and more. In this paper, with the rolling type imprinting process, a mold, placed upon the 2nd generation TFT-LCD glass sized substrate(370470 mm2), is rolled by a rubber roller to achieve a uniform residual layer. The prediction of residual layer thickness of the photoresist by rolling of the rubber roller is crucial to design the rolling type imprinting process, determine the rubber roller operation conditions - impressing force & feeding speed, operate smoothly the following etching process, and so forth. First, using the elasticity theory of contact problem and the empirical equation of rubber hardness, the contact length between rubber roller and mold is calculated with consideration of the shape and hardness of rubber roller and the pressing force to rubber roller. Next, using the squeeze flow theory to photoresist flow, the residual layer thickness of the photoresist is calculated with information of the viscosity and initial layer thickness of photoresist, the shape of mold pattern, feeding speed of rubber roller, and the contact length between rubber roller and mold previously calculated. Last, the effects of rubber roller operation conditions, impressing force & feeding speed, on the residual layer thickness are analyzed with consideration of the shape and hardness of rubber roller.
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