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研究生:洪韻茹
研究生(外文):Hong, Yun-Ru
論文名稱:大面積有機光電元件的製程開發與分析
論文名稱(外文):Development and Characterization of Large-Area Organic Optoelectronic Devices
指導教授:洪勝富
指導教授(外文):Horng, Sheng-Fu
學位類別:博士
校院名稱:國立清華大學
系所名稱:光電工程研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2014
畢業學年度:102
語文別:英文
論文頁數:98
中文關鍵詞:大面積有機太陽能電池共溶劑化學浴沉積法氧化鋅有機光偵測器陣列
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有機太陽能電池近年來受到各界矚目的主要原因為其可應用於大量生產的捲軸式製程低價製作於塑膠基板上,因此有機太陽能電池在價格上有很大的競爭力甚至在未來可望挑戰目前市佔率最高的矽晶太陽能電池。因此大面積捲軸式製程為有機太陽能電池未來必然的走向,此研究探討匹配於捲軸式製程之大面積刮刀塗佈技術在有機太陽電池製作之問題,目的是開發可適用於捲軸式製程製作之高效率大面機有積太陽電池製程方法。

我們首先探討刮刀製程之大面積塗佈問題,設定之元件結構為ITO/ Cs2CO3/P3HT:PCBM/PEDOT:PSS/Ag。然而在大面機刮塗製程中,常常會有表面缺陷的問題產生,我們發現使用共溶劑的方式可解決了大面積的塗佈製程中常會有表面缺陷的問題,同時我們利用小面積元件分析共溶劑對於元件太陽電池特性之影響,發現可利用兩種溶劑不同的沸點以及溶解度改善了主動層材料的垂直分布,進而改善了有機太陽電池之效率。

其次,我們探討適合於大面積反式結構電子選擇層之溶液製程。由於碳酸銫(Cs2CO3)具有易潮解的特性,對於元件壽命有很大的傷害。因此在大氣下穩定且具有高載子遷移率的材料氧化鋅(ZnO)近年來被廣泛的研究與使用,在此我們利用化學浴沉積法(Chemical Bath Deposition)來製備氧化鋅並成功的應用在有機太陽能電池上,並且也克服其他製備氧化鋅製程的缺點,製作出一表面平整、緻密且無孔洞的氧化鋅薄膜,最高效率可達4.61%。此方法未來更可應用於大面積捲軸式製程。

最後,由反式結構有機太陽電池研究,我們利用所觀察到的特殊I-V曲線開發出無須選擇元件即可獨立驅動之二維光偵測器結構。本研究裡我們成功製作出有機光偵測器陣列,並分析其特性。由於光偵測器在日常生活中已被廣泛應用,而有機光偵測器因其能夠製作在各種軟性基板上並可大面積化,因此深具發展潛力。

Table of Contents

摘要 I
ABSTRACT II
TABLE of COTENTs .IV
LIST OF FIGURES VI
LIST OF TABLES IX
1. Chapter 1: Introduction 1
1.1 Renewable energy 1
1.1.1 Solar cell and solar spectrum 1
1.1.2 History and development of solar cells 5
1.2 Organic solar cell 9
1.2.1 Brief history of OSCs 9
1.2.2 Materials for OSCs 10
1.2.3 Working principle 12
2. Chapter 2: Literature review 15
2.1 Bulk heterojunction structure 15
2.2 Inverted OPV device 17
2.2.1 Cs2CO3 based Inverted OPV device 17
2.2.2 Metal oxide based Inverted OPV device 18
3. Chapter 3: Simultaneous Enhancement in Both Large-Area Coatability and Photovoltaic Performance of Inverted Organic Solar Cells with Co-Solvent 21
3.1 Introduction 21
3.2 Experimental 24
3.3 Results and Discussions 29
3.3.1 Investigation of the surface morphology with different solvent treatments 29
3.3.2 Investigation of co-solvent effect 36
3.3.3 The effect of light soaking 43
3.4 Summary 45
4. Chapter 4: Photo-Carrier Transport in Inverted Bulk-Heterojunction Devices with Atomic Layer Deposition Prepared TiO2 as Hole-Blocking Layer 46
4.1 Introduction 46
4.2 Experimental 49
4.3 Results and Discussions 51
4.3.1 Design of the photo-detector device structure 51
4.3.2 Effect of TiO2 thickness 56
4.3.3 Investigation of inflection 58
4.3.4 Quantum Efficiency and Photo-response 58
4.3.5 Independent addressability 60
4.3.6 The photo-detector array 62
4.4 Summary 67
5. Chapter 5: Highly Efficient Inverted Organic solar cells using chemical bath deposited ZnO as electron selective layer 68
5.1 Introduction 68
5.2 Experimental 70
5.3 Results and Discussions 74
5.3.1 Temperature and PH effect on ZnO 74
5.3.2 Characterization of CBD-ZnO 75
5.3.3 Effect of ZnO thickness 79
5.3.4 Investigation of light soaking 83
5.3.5 Lifetime 83
5.3.6 Investigation of annealing temperature 87
5.4 Summary 91
6. Chapter 6: Conclusions 92
Reference 94

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