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题名	基于新型有机界面层的OPV电池的结构设计及其性能提高研究
作者	闫兴武
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	初蓓
关键词	有机界面层 OPV电池 复合界面 阳极修饰
其他题名	Design and improvement in OPV cells based on new type organic interlayers
学位专业	凝聚态物理
中文摘要	有机光伏(OPV)电池具有成本低，轻便，可弯曲，制备工艺简单等优点，有望成为未来的一种新型绿色能源。不过目前有机光伏电池的光电转化效率与无机PV电池相比仍然较低，因此需要对OPV电池进行深入的研究。OPV电池的界面层修饰是提高OPV电池性能的比较简单的途径。本论文主要工作是研究基于阳极界面层修饰的OPV电池的结构设计及其性能，主要包括以下内容： （1）制作了基于SubPc为受体，rubrene为给体的平面异质结OPV器件。因为rubrene的HOMO能级与SubPc的LUMO能级差比较大，所以该电池的开路电压很大，最大的开路电压可以达到1.45 V。器件的性能强烈的依赖于rubrene的厚度，当rubrene的厚度为5 nm时器件的性能最佳，经过优化的器件的效率可达2.52%，并且器件的稳定性也高于基于C60受体的器件。 （2） 采用电子传输层（ETL）和空穴传输层（HTL）构筑了有机双层复合阳极界面层，并将其应用于结构为ITO/CuPc/C60/Bphen/Al的平面异质结OPV器件，发现器件的光电转化效率得到改善。当采用3 nm F16CuPc和3 nm TAPC作为复合界面层时，器件获得了1.64%的效率，是没有阳极界面层的器件的1.64倍，是只有TAPC界面层的器件的2.98倍。研究表明器件的空穴收集过程是一个复合过程，即来自ITO的电子与来自给体的空穴在ETL/HTL界面层处复合；同时复合界面层的性能与ETL的LUMO能级与HTL的HOMO能级之差有关，当差值为0.6 eV时性能最好。 （3） 采用SubPc作为低浓度给体掺杂体异质结OPV电池阳极界面层，其器件结构为ITO/MoO3/SubPc/C60:5wt%TAPC/BCP/Al。当SubPc厚度为5 nm时，器件获得了3.75%的效率，比无SubPc界面层的器件的效率高35.4%，同时器件开路电压也得到提高。研究发现，优化器件的光谱响应中并没有来自SubPc的响应，而来自于C60的响应却得到显著提高。研究表明器件性能的改善是由于MoO3与SubPc相互作用提高了器件的内建电场。
英文摘要	Organic photovoltaic (OPV) cells have the advantages of low cost, light weight, flexible, simple preparation, etc., which are expected to become a new kind of green energy in the future. However, the power conversion efficiency (PCE) of OPV cells is still lower than that of inorganic counterparts. Thus it is necessary to further improve the performance of OPV cells. Interfacial modification of OPV cell is a simple way to improve their performance. The main research works of this thesis are to design new anode interface layers and to improve the performance of OPV cells. The main contents of are listed as follows: (1) We have fabricated a new OPV cells with rubrene and SubPc as the donor and acceptor, respectively. Due to the large difference between the highest occupied molecular orbital (HOMO) of the donor rubrene and the lowest unoccupied molecular orbital (LUMO) of the acceptor SubPc, a very high open-circuit voltage of 1.45 V is obtained. The performance of the device strongly depends on the thickness of rubrene, and a highest PCE of 2.52% under simulated AM1.5 G solar illumination at 100 mW/cm2 is realized at a thickness of rubrene as thin as 5 nm. Besides, the device also shows a superior stability compared to traditional device with C60 acceptor. (2) We have constructed a new organic hetero-interface layer which consists of a electron-transporting layer (ETL) and hole-transporting layer (HTL). Improved PCE is found in the planar heterojunction OPV cell with a structure of ITO/CuPc/C60/Bphen/Al when this organic hetero-interface layer is inserted between ITO anode and CuPc layer. The device with a F16CuPc (3nm)/TAPC (3 nm) hetero-interface layer shows a PCE of 1.67%, which is 1.64 times to that of the device without anode buffer layer and 2.98 times to that of the device with a single TAPC layer as the anode buffer layer. It is found that the hole extraction process is actually a electron-hole recombination process with electrons injected from ITO anode and holes extraction from CuPc. Besides, the property of this organic hetero-interface layer strongly depends on the energy difference between the HOMO level of HTL and LUMO level of ETL, and the optimized difference is found to be about 0.6 eV. (3) We used SubPc as the anode interlayer for the bulk heterojunction OPV cell with low donor concentration. The device has a structure of ITO/MoO3 (5 nm)/ SubPc/C60:5 wt% TAPC/BCP/Al. A maximum PCE of 3.75% is found for the device with a 5-nm-thick SubPc, which is increased of about 35.4% compared with the reference cell without SubPc. Besides, the Voc of the device is also increased. It is found that SubPc has no contribution the response the optimized device. On contrast, the response of C60 is increased significantly. The improvement is attributed to the increased build-in field of the device due to the interaction between MoO3 and SubPc.
公开日期	2015-12-24
内容类型	学位论文
源URL	[http://ir.ciomp.ac.cn/handle/181722/48935]
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	闫兴武. 基于新型有机界面层的OPV电池的结构设计及其性能提高研究[D]. 中国科学院大学. 2015.

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