臺灣博碩士論文加值系統

本研究是利用高真空蒸鍍系統來進行不同N型材料之PN異質接面有機太陽能電池的製備。在我們的研究過程裡，主要是利用多層結構的方式來完成有機太陽能電池的研製，其完整的元件結構為ITO/N型材料層/ZnPc (550 Å)/Ag (1000 Å)。在本研究的元件架構中，使用兩種不同的N型材料來進行元件光電特性的探討，分別為PTCDA及C60，而ITO、ZnPc及Ag則分別扮演陰極、P型材料層以及陽極的角色。
緊接著，本研究將有系統地探討N型材料對有機太陽能電池光電特性的影響。根據實驗結果顯示，使用N型材料PTCDA所製作的元件對光具有較優良的吸收能力而導致元件可更有效的吸收光子；除此之外，N型材料PTCDA具有較淺的缺陷能階，可使電子更有效地由材料缺陷能階釋放回材料最低軌域能階，有助於電子在N型材料PTCDA中傳導，我們認為這是造成使用N型材料PTCDA所完成的元件可得到較佳之光電特性的主要原因。

Organic solar cells based on p-n heterojunction with different n-type layer materials have been fabricated by high vacuum evaporator system. In our study, the device configurations of organic solar cells using multilayer structure were ITO/various n-type layer/ZnPc (550 Å)/Ag (1000 Å). Two different n-type layer materials were used: 3,4,9,10-perylene-tetracarboxylic dianhydride (PTCDA) and fullerene (C60). In this configuration, ITO, ZnPc, and Ag were used as cathode, p-type layer, and anode respectively.
The effects of different n-type layer materials on the photovoltaic properties of organic solar cells have been systematically investigated. Evidence showed that the device with PTCDA n-type layer exhibits better optical absorption ability, leading to obtain more effective absorption of photons. PTCDA also possesses a shallow bulk trap level, providing more detrapping electrons from the bulk trap states into the lowest unoccupied molecular orbital states for transporting in PTCDA. We suggest that these are the main contributing factors to the superior photovoltaic performances of this device.

CONTENTS
Publications and Preprints I
Abstract (in Chinese) II
Abstract (in English) IV
Acknowledgment VI
Figure Caption VII
Table Caption VIII
Contents IX

Chapter 1 Introduction 1
1.1 Background 1
1.2 Motivation 2
1.3 Organization of This Thesis 3

Chapter 2 Basic Theories of Solar Cell 4
2.1 Solar radiation 4
2.2 Basic principle of p-n heterojunction organic solar cell 5
2.3 Characteristics of organic photovoltaic cell 6

Chapter 3 Experimental Procedure 8
3.1 Experimental materials 8
3.2 Vacuum evaporation system 8
3.3 Device fabrication of photovoltaic cell 9
3.3.1 Etching of ITO 9
3.3.2 Cleaning of ITO 10
3.3.3 Deposition of Organic Thin Films and metal anode 10
3.4 Measurements 11

Chapter 4 Results and Discussion 12
Chapter 5 Conclusions 15

References 16
Figures and Table 23
Autobiography 35

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