343 0

인쇄전자용 미세패턴 구현을 위한 잉크젯헤드 개발과 평가

Title
인쇄전자용 미세패턴 구현을 위한 잉크젯헤드 개발과 평가
Other Titles
Development and Characterization of Picoliter Inkjet Head for Micro Patterning of Printed Electronics
Author
유영석
Alternative Author(s)
Yoo, Young Seuck
Advisor(s)
박진구
Issue Date
2013-02
Publisher
한양대학교
Degree
Doctor
Abstract
As electronic products have become slim and miniaturized, inkjet printing solution based on drop-on-demand (DOD) has become one of most promising manufacturing technologies for metal-patterning on substrate in micro scale. Many electronics companies have recently started to apply the inkjet technology to industrial applications such as PCB, liquid crystal display (LCD) color filter, LCD thin film transistor (TFT) electrode, plasma display panel (PDP) silver electrode, and solar cells. As these electronic parts are continuously miniaturized, conductive metal line width for electronic circuits is naturally required to be narrower, demanding inkjet printhead capable of ejecting small droplet with volume of 1 pℓ. In order to develop 1 pℓ inkjet printhead, an unique design verification system based on multiphysics modeling and micro-electro-mechanical systems (MEMS) fabrication has been established to develop piezoelectric inkjet printheads for micro-patterning on printed electronics. Piezoelectric printheads have been designed and fabricated with silicon and silicon on insulator (SOI) wafers by MEMS process and silicon to silicon bonding method. Methods such as improving nozzle fabrication uniformity within actual manufacturing process, method of observing and evaluating adherence of silicon bonding, and method of improving the adherence are studied in this study. Transient displacements of a piezoelectric actuator according to voltage waveform are measured by Laser Doppler Vibrometer (LDV), and compared with numerical predictions by the three-dimensional piezoelectric-structure interaction modeling. The mechanism of droplet ejection from the inkjet printhead is identified by simulating two-phase flows of the air and metal inks. As a preliminary approach, liquid metal jetting phenomena are identified by simulating droplet ejection and droplet formation in a sequential manner. Parametric studies are followed by the design optimization process to identify key issues in inkjet head performance: printhead configuration, input voltage amplitude, fluidic and structural crosstalks, ink viscosity, acoustic wave propagation (or effects of limited compressibility), and meniscus instability at higher frequencies. During the development of 1 pℓ printhead, droplet formation is observed with altering key factors of ink flow part. Chamber shape shows most prominent effect on the droplet formation. The droplet volume is controlled by changing the chamber size. Additionally, drive waveform also affected droplet volume. The effect of drive waveform on ejection of 1 pℓ droplet is also studied. At last the present design verification system has shown its promising applicability to novel-concept designs of SemJet® printheads for wide range of printed electronics and bio applications.
URI
https://repository.hanyang.ac.kr/handle/20.500.11754/134324http://hanyang.dcollection.net/common/orgView/200000421684
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > BIONANOTECHNOLOGY(바이오나노학과) > Theses (Ph.D.)
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE