ICFO-Institut de Ciències Fotòniques Mediterranean Technology Park , 08860 Castelldefels, Barcelona, Spain.
ACS Appl Mater Interfaces. 2015 Mar 4;7(8):4541-8. doi: 10.1021/am5071909. Epub 2015 Feb 19.
Future optoelectronic devices and their low-cost roll-to-roll production require mechanically flexible transparent electrodes (TEs) and substrate materials. Indium tin oxide (ITO) is the most widely used TE because of its high optical transmission and low electrical sheet resistance. However, ITO, besides being expensive, has very poor performance under mechanical stress because of its fragile oxide nature. Alternative TE materials have thus been sought. Here we report the development of a multilayer TiO2/Ag/Al-doped ZnO TE structure and an ITO-free polymer solar cell (PSC) incorporating it. Electro-optical performances close to those of ITO can be achieved for the proposed TE and corresponding PSC with an additional advantage in their mechanical flexibility, as demonstrated by the fact that the cell efficiency maintains 94% of its initial value (6.6%) after 400 cycles of bending, with 6 and 3 cm maximum and minimum radii, respectively. Instead of common plastic materials, our work uses a very thin (0.14 mm) flexible glass substrate with several benefits, such as the possibility of high-temperature processes, superior antipermeation properties against oxygen and moisture, and improved film adhesion.
未来的光电设备及其低成本的卷对卷生产需要机械灵活的透明电极 (TE) 和基底材料。铟锡氧化物 (ITO) 因其高透光率和低电阻而被广泛用作 TE。然而，ITO 除了昂贵之外，由于其易碎的氧化物性质，在机械应力下的性能非常差。因此，人们一直在寻找替代 TE 材料。在这里，我们报告了一种多层 TiO2/Ag/Al 掺杂 ZnO TE 结构的开发以及包含该结构的 ITO 免费聚合物太阳能电池 (PSC)。所提出的 TE 和相应的 PSC 的光电性能可以接近 ITO 的性能，并且具有机械灵活性的额外优势，这一点可以通过以下事实证明：在 400 次弯曲循环后，电池效率保持其初始值（6.6%）的 94%，最大和最小半径分别为 6 和 3 厘米。与常见的塑料材料不同，我们的工作使用了一种非常薄的（0.14 毫米）柔性玻璃基板，具有多种优势，例如可以进行高温处理、对氧气和水分具有优越的防渗性能以及改善的薄膜附着力。
