서지주요정보
Effects of flux activators addition in nanofiber/solder anisotropic conductive films (ACFs) on the solder wettability of flex-on-flex (FOF) assembly = 열산발생제가 첨가된 나노파이버/솔더 이방성 전도필름을 이용한 Flex-on-Flex 어셈블리에서의 솔더 젖음성에 관한 연구
서명 / 저자 Effects of flux activators addition in nanofiber/solder anisotropic conductive films (ACFs) on the solder wettability of flex-on-flex (FOF) assembly = 열산발생제가 첨가된 나노파이버/솔더 이방성 전도필름을 이용한 Flex-on-Flex 어셈블리에서의 솔더 젖음성에 관한 연구 / Ji Soo Lee.
저자명 Lee, Ji Soo ; 이지수
발행사항 [대전 : 한국과학기술원, 2017].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8031368

소장위치/청구기호

학술문화관(문화관) 보존서고

MMS 17050

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

The advanced electronic device trends are changing to be more and more light weighted and miniaturized. And due to the rapid growth of wearable electronic industry, demands for flexible packaging are growing, and advanced flexible interconnection methods are required. In order to satisfy the needs, fine pitch Flex-on-Flex (FOF) assembly has been introduced, because FOF can reduce not only the package area of the whole devices, but also show excellent electrical performance such as lower contact resistance and higher power handling capability. Anisotropic conductive films (ACFs) are interconnection materials, which have been widely used for the FOF assembly due to their simple and low temperature assembly processes. Previously, nanofiber ACFs were introduced by our research group, which showed remarkable capability of enhancing the conductive ball capture rate along with preventing short circuit in the fine pitch assembly such as COG (Chip On Glass) and FOF by suppressing the movement of conductive particles. In the previous FOF studies, ultrasonic bonding method was used as a solder ACFs bonding method. In the ultrasonic bonding method, native solder oxide layers around solder balls can be physically broken by applying ultrasonic vibrations above the melting temperature of solder balls resulting in excellent solder metallurgical joints between solder particles and metal electrodes. However, there could be potential misalignment and damage issues generated by ultrasonic vibrations for mechanically sensitive and fine pitch applications. Accordingly, there has been need for alternative bonding methods which can remove solder oxide layer to obtain excellent solder wetting without causing misalignment issues by the ultrasonic bonding method. In this study, flux activators were added in nanofiber/solder ACFs to chemically eliminate solder oxide during the thermo-compression bonding process. For the formation of stable intermetallic compounds (IMCs), optimization process of flux activators content in nanofiber solder ACFs was investigated. To investigate the flux effect during the thermo-compression bonding process, cross-sectional transmission electron microscopy (TEM) were performed to analyze whether solder oxide layer is certainly removed by the flux or not. In addition, contact resistance was also measured to support this TEM analysis. Eventually, by adding flux activators in nanofiber/ solder ACFs, stable solder wetting and excellent alignment could be obtained by using thermo-compression bonding method for the fine pitch FOF assembly.

최근 전자기기의 트렌드는 점점 더 작게 가볍게 그리고 유연하게 만드는 것이다. 이러한 트렌드를 이끌어 가기 위해서는 플렉서블한 칩과 칩 사이에 미세피치 연결기술이 필요하다. 따라서, 본 연구에서는 나노파이버/솔더 이방성 전도필름이 Flex-on-FLex 어셈블리에 적용되었다.

서지기타정보

서지기타정보
청구기호 {MMS 17050
형태사항 v, 50 p. : 삽도 ; 30 cm
언어 영어
일반주기 저자명의 한글표기 : 이지수
지도교수의 영문표기 : Kyoung Wook Paik
지도교수의 한글표기 : 백경욱
학위논문 학위논문(석사) - 한국과학기술원 : 신소재공학과,
서지주기 Including references
주제 flex-on-flex
fine pitch
flux
flux activator
nanofiber anisotropic conductive film
나노파이버
이방성전도필름
나노파이버 이방성전도필름
플렉스
열산발생제
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