【作者】 苏梦蟾；

【导师】 梁春军； 衣立新；

【作者基本信息】 北京交通大学 ， 物理电子学， 2007， 硕士

【摘要】 当今世界随着经济的快速发展,能源问题越来越引起人们的重视。矿物燃料枯竭引起的能源危机,燃烧矿物燃料引起的温室效应使得人类的生存环境面临重大挑战。占地球总能量99%以上的太阳能逐渐进入人们的视野,太阳能所具有的分布广阔获取方便、对人无害不污染环境、取之不尽用之不竭的优点受到众多科学家的青睐。本论文则是针对具体基于聚合物有机太阳能电池的研究,主要在两个方面进行了有益探索:第一,对于不同结构的有机太阳能电池的比较研究。我们使用了MEH-PPV为给体(空穴传输)、C60为受体(电子传输)首先制备了分层和体异质结结构的两种器件,器件结构为ITO / PEDOT:PSS / MEH-PPV/ C60 / Al和ITO / PEDOT:PSS / MEH-PPV:C60 / Al。之后又制备了结构为ITO /PEDOT:PSS / MEH-PPV:C60 / C60 / Al的第三个器件。我们比较了这三种器件的光伏性质,发现器件3的短路电流密度(JSC)比器件1和器件2的分别增加了300%和150%,开路电压(VOC)分别增加了100%和20%。这主要是由于C60层增加了电子由受体传输到负电极的通道并增大了给体受体界面面积。另一原因是这一C60层一定程度地阻挡了空穴从有机物向阴极的传输。因此这一结构上的改进有效地改善了电池的性能。第二,基于对前面工作的进一步深入,探讨了对于有机太阳能电池的阳极修饰的比较研究,得到了令人兴奋的结果。在这一部分共制备了四种不同结构的有机太阳能电池器件。其器件结构是,器件1:ITO / LiF / PEDOT:PSS / MEH-PPV / C60 / Al、器件2:ITO / PEDOT:PSS / MEH-PPV / C60 / Al、器件3:ITO / LiF / PEDOT:PSS / MEH-PPV :C60 / C60 / Al和器件4:ITO / PEDOT:PSS / MEH-PPV:C60 / C60 / Al。之后我们测量了它们的电流-电压特性,结果显示出在ITO和PEDOT:PSS之间插入一薄层LiF使得器件性能得到较大提高。其器件1的JSC和FF比器件2的提高了74%和31%;器件3的JSC比器件4的提高了约40%。这主要是由于LiF层在ITO和PEDOT:PSS之间形成了良好的界面特性,并且本文作者推测LiF层可能有效地抑制更多还原

【Abstract】 With high-speed development of economy all over the world, energy problem gives rise to regard of people more and more. The reduction of mineral fuel causes energy crisis and burning of mineral fuel causes greenhouse effect that makes existent environment of people face to great challenge. People have taken notice of solar energy that is over 99% of total energy on the earth, and solar energy has so many merits that many scientists have focused on them like as widest distribution and convenient acquisition, innocuity to persons and disbefouling environment, extremely excessive amount, et al. In this thesis, we aimed at material study of organic solar cells based on polymer, and carried through beneficial exploration in two aspects mainly:Firstly, coparative study on organic solar cells with different structures have been engaged. Two solar cells with the device structures of ITO / PEDOT:PSS / MEH-PPV/ C60 / Al and ITO / PEDOT:PSS / MEH-PPV:C60 / Al, in which poly 1,4-(2-methoxy-5-ethylhexyloxy) phenylenevinylene (MEH-PPV) is used as electron donors and fullerene (C60) is used as electron acceptors, were fabricated. Then the third device with the structure of ITO /PEDOT:PSS / PPV:C60 / C60 / Al was fabricated too. We compared the photovoltaic properties of these devices and found that short circuit density (JSC) of device 3 increases by about 300% and 150% than that of device 1 and device 2, respectively; open circuit voltage (VOC) increases by about 100% and 20%. The increased solar cell performance mostly can attribute to evaporating a layer of C60 to increase the amount of paths that electrons transfer from acceptor to cathode and enlarge the area of donor–acceptor interface. The other reason is that the C60 layer block the hole transfer from organics to cathode in some ways. Such change in structure of solar cells improves the performance of the solar cells effectively.更多还原