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논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 발행연도
- 2014
- 저작권
- 서울대학교 논문은 저작권에 의해 보호받습니다.
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초록· 키워드
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In this thesis, the bulk-ionized photoconductivity of fullerenes in the Schottky solar cells has been investigated by three experiments. First, comparison of C60 and C70 is carried out. Since C70 has larger exciton generation rate (more overlap with solar spectrum about 2.3 times) than C60, photoconductivity of C70 is higher than C60. But, increase in photoconductivity is only 1.7 times, due to difference in thermalization distance. It is discussed with X-ray scattering data.
Then, work function of electrode is changed with interfacial layers. Linear dependence of photocurrent on electric field is observed and changing the interfacial layer to modify work functions of electrode leads to variation of the built-in potential (Vbi). These have been confirmed by calculations using equation from photoconductivity and capacitance-voltage (C-V) characteristics.
Third experiment is inserting CuI as a templating layer. In the images of grazing incidence wide angle x-ray scattering (GIWAXS), C60 on CuI layer shows higher crystallinity than C60 on ITO substrate. The preferred orientation is FCC(111) which is closed packing plane for vertical direction to substrate. This effect makes photoconductivity increase by 43.8% in MoO3 used and by 93.5% in ReO3 used Schottky solar cells.
Finally, based on these results, high efficiency solar cells with 6.2% have been achieved.
Then, work function of electrode is changed with interfacial layers. Linear dependence of photocurrent on electric field is observed and changing the interfacial layer to modify work functions of electrode leads to variation of the built-in potential (Vbi). These have been confirmed by calculations using equation from photoconductivity and capacitance-voltage (C-V) characteristics.
Third experiment is inserting CuI as a templating layer. In the images of grazing incidence wide angle x-ray scattering (GIWAXS), C60 on CuI layer shows higher crystallinity than C60 on ITO substrate. The preferred orientation is FCC(111) which is closed packing plane for vertical direction to substrate. This effect makes photoconductivity increase by 43.8% in MoO3 used and by 93.5% in ReO3 used Schottky solar cells.
Finally, based on these results, high efficiency solar cells with 6.2% have been achieved.
목차
Chapter 1 Introduction 11.1 Motivation 11.2 Principle of Organic Photovoltaic Cells 51.3 Photoconductivity 71.4 Schottky Solar Cells 9Chapter 2 Comparison of C60 and C70 122.1 Introduction 122.2 Experiments 142.3 Result and Discussion 162.4 Conclusion 23Chapter 3 Effect of work function of electrode 243.1 Introduction 243.2 Experiments 253.3 Result and Discussion 263.4 Conclusion 39Chapter 4 Effect of inserting CuI layer 404.1 Introduction 404.2 Experiments 414.3 Result and Discussion 424.4 Conclusion 56Chapter 5 Low-donor concentration solar cells 575.1 Introduction 575.2 Experiments 585.3 Result and Discussion 605.4 Conclusion 63Summary 64References 66요약(국문초록) 68
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