School of Material Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, United States.
Nano Lett. 2011 Nov 9;11(11):4812-7. doi: 10.1021/nl202648p. Epub 2011 Oct 3.
We report the first observation of piezotronic effect on the output voltage of a flexible heterojunction solar cell. The solar cell was fabricated by contacting poly(3-hexylthiophene) (P3HT) with one end of a ZnO micro/nanowire to form a p-n heterojunction on a flexible polystyrene (PS) substrate. The open-circuit voltage V(oc) of the solar cell was characterized by tuning the strain-induced polarization charges at the interface between ZnO and P3HT. The experimental data were understood based on the modification of the band structure at the p-n junction by the piezopotential, which is referred as a result of the piezotronic effect. This study not only provides an in-depth understanding about the effect but also is useful for maximizing the output of a solar cell using wurtzite structured materials.
我们首次观察到了在柔性异质结太阳能电池的输出电压上的压电器件效应。该太阳能电池是通过将聚(3-己基噻吩)(P3HT)与氧化锌微/纳米线的一端接触，在柔性聚苯乙烯(PS)基底上形成 p-n 异质结而制造的。通过调节氧化锌和 P3HT 界面处的应变诱导极化电荷，对太阳能电池的开路电压 V(oc)进行了表征。实验数据基于压电势对 p-n 结能带结构的修正进行了理解，这被称为压电器件效应的结果。这项研究不仅提供了对该效应的深入了解，而且对于最大化使用纤锌矿结构材料的太阳能电池的输出也很有用。
