Department of Microsystems, IKERLAN S. COOP, Goiru Kalea, 2, 20500 Arrasate-Mondragon, Spain E-20500.
Phys Chem Chem Phys. 2011 Dec 14;13(46):20871-6. doi: 10.1039/c1cp22830g. Epub 2011 Oct 17.
1-Dimensional nanostructured ZnO electrodes have been demonstrated to be potentially interesting for their application in solar cells. Herein, we present a novel procedure to control the ZnO nanowire optoelectronic properties by means of surface modification. The nanowire surface is functionalized with ZnO nanoparticles in order to provide an improved contact to the photoactive P3HT:PCBM film that enhances the overall power conversion efficiency of the resulting solar cell. Charge extraction and transient photovoltage measurements have been used to successfully demonstrate that the surface modified nanostructured electrode contributes in enhancing the exciton dissociating ratio and in enlarging the charge lifetime as a consequence of a reduced charge recombination. Under AM1.5G illumination, all these factors contribute to a considerably large increase in photocurrent yielding unusually high conversion efficiencies over 4% and external quantum efficiencies of 87% at 550 nm for commercially available P3HT:PCBM based solar cells. The same approach might be equally used for polymeric materials under development to overcome the record reported efficiencies.
一维纳米结构的 ZnO 电极在太阳能电池中的应用具有很大的潜力。在此，我们提出了一种通过表面修饰来控制 ZnO 纳米线光电性能的新方法。通过在纳米线表面功能化 ZnO 纳米粒子，改善了与光活性 P3HT:PCBM 薄膜的接触，从而提高了太阳能电池的整体功率转换效率。电荷提取和瞬态光电压测量成功地证明了表面修饰的纳米结构电极有助于提高激子离解比，并由于减少了电荷复合而延长了电荷寿命。在 AM1.5G 光照下，所有这些因素都有助于显著增加光电流，从而使基于商业上可用的 P3HT:PCBM 的太阳能电池的转换效率超过 4%，在 550nm 处的外量子效率达到 87%。对于正在开发的聚合材料，也可以采用相同的方法来克服已报道的效率记录。
