QQ客服 官方微博 反馈留言

题名	有机太阳能电池结构设计与性能改善研究
作者	晋芳铭
学位类别	博士
答辩日期	2015-05
授予单位	中国科学院大学
导师	李振声
关键词	有机太阳能电池 给体低浓度掺杂 叠层电池 Ag纳米颗粒 激子阻挡层
其他题名	Design and Photovoltaic Performances Study of Organic Solar cells
学位专业	凝聚态物理
中文摘要	有机太阳能电池因其成本低、无污染、制备简单、易于实现柔性器件等优点而成为了近年来的研究热点。虽然有机太阳能电池的效率已经突破了10%，但与无机太阳能电池相比仍有巨大的差距。为了实现有机太阳能电池的商业应用，必须进一步提高其能量转换效率。本论文通过对有机小分子太阳能电池物理过程的研究和新的器件结构设计来提高有机光伏太阳能电池效率，主要研究工作集中在以下几个方面： 1. 研究了给体低浓度掺杂体异质结太阳能电池的光伏性能。我们将一系列的给体材料如NPB、CBP、m-MTDATA、CuPc 和 TCTA 以不同的浓度掺入C60受体基质中，发现掺杂浓度对器件性能影响很大。最佳的光伏性能在给体浓度为5%左右的时候获得。研制的以NPB作为给体的低掺杂浓度的体异质结器件的能量转换效率达到了2.25%，比平面异质结器件提高了一倍。我们发现不同给体的低掺杂浓度的体异质结器件性能差异主要是因为它们的HOMO能级不同造成的。我们发现最佳的给体与受体的HOMO能级差为0.8 eV左右。在这一发现的基础上，我们使用SubPc作为低浓度掺杂体异质结器件的给体，C70作为受体制作子电池，Bphen/Ag/F16CuPc/MoO3作为连接层，制备出效率达到7.66%的高效率叠层电池。实验中发现F16CuPc对于扩大连接层中的复合区，促进载流子的收集具有重要的作用。最终，叠层器件与单个器件相比能量转换效率提高了38%。 2. Ag纳米颗粒对倒置小分子太阳能电池性能改善研究。我们将Ag纳米颗粒通过热蒸发的方法制备到倒置小分子太阳能电池中，将倒置小分子太阳能电池的效率提高了33%。我们证明了Ag纳米提高倒置电池性能的原因一方面是因为局域表面等离激元共振作用提高了器件的吸收，另一方面是因为Ag纳米对ITO表面的修饰作用和对器件电学性能的改善促进了电荷收集。 3.电极缓冲层对器件性能的改善研究。我们设计出Bphen/MoO3复合阴极缓冲层，并将其成功应用到有机太阳能电池中。与传统的只使用Bphen作为阴极缓冲层的参考器件相比，使用Bphen/MoO3复合阴极缓冲层器件的能量转换效率和寿命均获得了大幅的提高。另一方面，通过在给体SubPc之前插入2 nm 的CBP,我们制备出高效率的平面异质结电池。插入CBP后，电池的短路电流迅速从5.32 mA/cm2 提高到7.53 mA/cm2，提高幅度达到了41%。在电池开路电压和填充因子保持不变的情况下，器件的能量转换效率从3.48% 提高到了5.01%。我们证明了CBP提高电池短路电流的原因是因为它在电池阳极侧的激子阻挡作用。
英文摘要	Organic solar cells (OSCs) are potential low-cost alternative to their conventional inorganic counterpart due to their ease of processing and compatibility with flexible substrates and have been drawn much attention in recent years. Maximal power conversion efficiencies (PCE) of OSCs have reached above 10%. However, further improvement of PCE is required for commercialization due to the PCE of OSCs is still much smaller than that of inorganic solar cells. In this thesis, we study physical mechanism and design novel structure of small molecular weight organic solar devices for improving their efficiency. 1. We have studid the photovoltaic (PV) performance of small molecular solar cells based on bulk heterojunction (BHJ) devices with small ratio donors doped in C60 matrix. A series of donor materials such as NPB、CBP、m-MTDATA、CuPc and TCTA are blended with C60 by different ratio. The optimum PCE is obtained at a rather low donor ratio of 5%. PCE of BHJ cell based on NPB donor reaches 2.25%, which is double of that of the planar heterojunction (PHJ) cell. We obtain that ΔEHOMO(HOMOC60–HOMOdonor) between C60 acceptor and donors would offer a maximal influence on achieving maximal PCE and an optimal ΔEHOMO locates around 0.8 eV. Besides, highly efficient organic tandem solar cell with peak PCE of 7.66% has been demonstrated by simply stacking two same SubPc:C70 bulk heterojunction devices, with a high active inter-connecting layer composed of Bphen/Ag/F16CuPc/MoO3. We find that F16CuPc plays an important role in the inter-connecting layer. Thin F16CuPc film extends the recombination zone, facilitates the extraction of hole and the carrier recombination. The measured PCE of the tandem solar cell is 7.66%，which corresponds to a 38% increase compared to that the optimal single cell. 2. We demonstrate a highly efficient inverted small molecular solar cell with integration of Ag nanoparticles (NPs) into the devices. The optimized device based on thermal evaporated Ag NPs provides a PCE of 4.87%, which offers 33% improvement than that of the reference device without Ag NPs. Such a high efficiency is mainly attributed to the improved electrical properties by virtue of the modification of the surface of ITO with Ag NPs and the enhanced light harvesting due to localized surface plasmon resonance (LSPR). 3. We studied the effect of electrode buffer layer on the performance of organic solar cells. A compound layer of Bphen/MoO3 is firstly introduced to the cathode side as a cathode buffer layer (CBL). Such a compound CBL greatly extends device PCE and stability simultaneously compared with the traditional Bphen CBL. What is maore, high-efficiency SubPc/C60 based small molecular PHJ organic solar cells with CBP as anode exciton blocking layer (EBL) have been demonstrated. Through inserting 2 nm CBP before the donor SubPc, Jsc of OSCs exhibits a significantly increase by 41% from 5.32 to 7.53 mA/cm2 while the FF and VOC remain constant, resulting in a substantial enhancement in the PCE from 3.48% to 5.01% due to the exciton blocking effect of CBP at anode side. Evidence for anode exciton blocking effect of CBP is observed by photoluminescent spectra and some other methods.
公开日期	2015-12-24
内容类型	学位论文
源URL	[http://ir.ciomp.ac.cn/handle/181722/48854]
专题	长春光学精密机械与物理研究所_中科院长春光机所知识产出
推荐引用方式 GB/T 7714	晋芳铭. 有机太阳能电池结构设计与性能改善研究[D]. 中国科学院大学. 2015.

个性服务

查看访问统计

相关权益政策

暂无数据

收藏/分享

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。