NAYF4:Yb3+, Tm3+微米棒修饰TiO2光阳极以增加染料敏化太阳能电池光子捕获

摘要

光阳极是染料敏化太阳能电池（DSSC）的核心部件，其性能直接影响器件性能。研究中广泛使用的敏化染料N719在可见光区域具有很好的吸收，但在红外和近红外区域吸收较差，掺杂上转换材料的光阳极是一种拓宽染料吸收光谱的有效途径。本论文介绍了一种利用上转换晶体微米棒NayF4:Yb3+，Tm3+掺杂在TiO2光阳极中用于提高太阳光的红外辐射捕获，从而提高DSSC效率的有效方法。 用水热法制备了不同条件下的NaYF4:Yb3+、Tm3+粒子的光致发光上转换材料，通过扫描电子显微镜（SEM）X射线衍射（XRD）和光致发光上转换和下转换谱，研究了其物理和光学性质。讨论了NaYF4：Yb3+，Tm3+粒子上转换和下转换的能量转移机制。研究了NaYF4:Yb3+、Tm3+粒子不同组成、大小和形貌，对其上转换效率的影响研究结果表明其组成为NaYF4:Yb3+（10%）、Tm3+（1%）的微米棒（六方棒状）的效果最好。 将制备的NaYF4:Yb3+、TM3+粒子掺杂在TiO2光阳极中，用于DSSC，结果表明加入少量的这些发光微米棒提高了光阳极的光捕获能力，从而增强了光电流转换。这些稀土离子是p型掺杂剂，提高了TiO2薄膜的能级，从而提高了光电压。掺杂NaYF4:Yb3+、Tm3+在TiO2（重量）最佳配比为：5％NaYF4：Yb3+，Tm3+与TiO2。作为光阳极使电池的最大光电转换为7.03%。比纯TiO2光阳极（6.13%）的效率高17%。这种改进可以归功于掺杂材料的上转换特性。

目录

声明

Chapter 1 Literature Review

1.1 Introduction

1.2 Solar Cells

1.2.1 Overview of Solar Cells

1.2.2 Silicon-based Solar Cells

1.2.3 Compound Thin Film Solar Cells

1.2.4Third Generation Solar Cells

1.3 Dye-Sensitized Solar Cells

1.3.1 Structure of Dye-Sensitized Solar Cells

1.3.2Working Principle of Dye-Sensitized Solar Cells

1.3.3Photoelectric Performance Parameters of DSSCs

1.3.4Development of Dye-Sensitized Solar Cells

1.4 Research Progress of Photoanodes for TiO2 Nanomaterials

1.4.1 Progress in Morphology of TiO2 Photoanode Materials

1.4.2 Research Progress of Modification TiO2 Photoanodeby Addition of Impurity

1.5 Themes and Research Contents

Chapter 2 Preparationand Analysis of Dual Conversional β-NaYF4:Yb3+,Tm3+ Particles

2.1 Introduction

2.2Experimental Section

2.2.1 Main Raw Materials, Reagents and Experimental Instruments

2.2.2Experimental and Analysis Instruments

2.2.3 Preparation of β-NaYF4:Yb3+,Tm3+ Traditional Microprism Shaped Particles

2.2.4 Preparation of β-NaYF4:Yb3+,Tm3+ Microrods Shaped Particles

2.3Characterization of Samples and Testing of Optical Performance

2.3.1 Characterization of NaYF4:Yb3+,Tm3+ Particles

2.3.2Optical Properties of NaYF4:Yb3+,Tm3+ Particles

2.4Results and Discussion

2.4.1 Structure and Morphology

2.4.2 Optical Properties of NaYF4:Yb3+,Tm3+ Particles

2.4.3Energy Transfer Mechanism

2.4.4Upconversion Luminescence Mechanism in NaYF4:Yb3+,Tm3+ Microrods

2.4.5Downconversion Luminescence Mechanism

2.5Summary of This Chapter

Chapter 3 Preparation of UC@TiO2 Photoanode based DSSCs and Their Analysis

3.1 Introduction

3.2 Experimental Section

3.2.1 Main Raw Materials and Reagents

3.2.2 Main Experimental and Analytical Instruments

3.2.3Preparation of Dye-Sensitized Solar Cells

3.3 Characterization of TiO2 and Testing of Cell Performance

3.3.1 Characterization of TiO2 Nanoparticles

3.3.2 Photoelectric Properties of Dye-Sensitized Solar Cells

3.4 Results and Discussion

3.4.1 Structure and Morphology

3.4.2 Photoelectric Properties

3.5 Summary of This Chapter

Chapter 4 Conclusions and Outlook

4.1 Conclusion

4.2 Future Outlook

参考文献

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