표제지
목차
요약 5
I. 서론 9
1.1. 연구의 배경 및 목적 9
1.2. 투명전극 11
1.2.1. ITO의 문제점 12
1.3. 대체 전극 12
(1) Graphene 12
(2) 탄소나노튜브 (Carbon nanotubs, CNTs) 13
(3) Metal mesh 14
(4) 전도성 폴리머 14
(5) Silver nanowire (AgNW) 15
1.3. 플렉서블 전자소자의 유연 신뢰성 연구 필요성 16
II. Silver nanowire ink 합성 및 sample 제작 17
2.1. Silver nanowire ink 제조 17
(1) 폴리올 액상환원법 (polyol precess) 17
(2) Anodic aluminium oxide(AAO) 멤브레인 방법 19
2.2. Silver nanowire film의 제조 20
2.3. 롤투롤 (Roll-to-Roll, R2R) 제조 공정 20
III. 실험 방법 22
3.1. 기계적 신뢰성 시험 22
(1) 곡률 반경 및 변형률 산출 이론 22
(2) Bending test 24
(3) Static bending test 26
(4) Stretching test 26
(5) Bending fatigue test 28
3.2. 환경신뢰성 시험 29
3.3. 전기적 신뢰성 시험 30
(1) 전압 내구성 시험 30
(2) 전류 신뢰성 시험 30
(3) 전기 및 기계 복합 신뢰성 시험 30
IV. 실험 결과 및 고찰 31
4.1. Silver nanowire 전극의 특성 31
(1) Silver nanowire 투명 전극의 전기적 특성 31
(2) Silver nanowire 투명전극의 광 투과도 32
4.2. Silver nanowire 전극의 기계적 특성 33
(1) Bending 특성 분석 33
(2) Static bending 특성 분석 35
(3) Stretching 특성 분석 36
(4) Bending fatigue 특성 분석 37
4.3. Silver nanowire 전극의 환경 신뢰성 38
4.4. Silver nanowire 전극의 전기적 신뢰성 40
(1) 전압 내구성 시험 40
(2) 전류 신뢰성 시험 42
(3) 전기 및 기계 복합 신뢰성시험 43
V. 결론 47
참고문헌 49
Abstract 54
Table 2.1. Various chemical solutions for polyol precess 18
Fig. 1.1. Various applications of using flexible technology 10
Fig. 1.2. The fixed radius of curved TV and Galaxy Edge 10
Fig. 1.3. Transmittance(T) in the visible range as a function of the sheet... 11
Fig. 1.4. Structure of the (a) graphene (b) single-wall CNT... 13
Fig. 2.1. Growth machinism of silver nanowire by polyol precess 18
Fig. 2.2. AAO membrane method for growing silver nanowire 19
Fig. 2.3. Roll-to-Roll process of (a) Silver nanowire with over-coating and... 21
Fig. 3.1. Schematic drawing of bending test with bending radius of r by (a)... 23
Fig. 3.2. Bending test machine of mechanical reliability for flexible devices 25
Fig. 3.3. Stretching tester of mechanical reliability for flexible devices 27
Fig. 3.4. Bending fatigue test machine of mechanical reliability for flexible devices 28
Fig. 3.5. Temperature and humidity test chamber 29
Fig. 4.1. SEM images of (a) silver nanowire and (b) silver nanowire with... 31
Fig. 4.2. (a) Image of UV-Vis spectrophotometer and (b) the transmittance... 32
Fig. 4.3. The result of (a)outer bending test and before/after image of optical... 34
Fig. 4.4. Results of environmental reliability by (a) none bending,... 35
Fig. 4.5. The result of stretching test and before/after image of optical... 36
Fig. 4.6. Outer bending fatigue test results of silver nanowire and silver... 37
Fig. 4.7. Environment reliability of none/static bending test by (a) 85℃... 39
Fig. 4.8. IR image of heat dispersion on silver nanowire electrode and silver... 40
Fig. 4.9. Measurement of resistance & current change rate by electrical... 41
Fig. 4.10. Current density change by electrical stress 42
Fig. 4.11. Current density change by electrical and mechanical stress on... 44
Fig. 4.12. (a) The average temperature change and (b) IR camera image of... 45
Fig. 4.13. FESEM image of damaged silver nanowire by electrical and... 46