ISIS &icFRC, University of Strasbourg &CNRS, 8 allée Gaspard Monge, 67000 Strasbourg, France.
Laboratory for Organic Matter Physics, University of Nova Gorica, Vipavska 13, SI-5000 Nova Gorica, Slovenia.
Nat Nanotechnol. 2016 Oct;11(10):900-906. doi: 10.1038/nnano.2016.125. Epub 2016 Jul 25.
Supramolecular organic nanowires are ideal nanostructures for optoelectronics because they exhibit both efficient exciton generation as a result of their high absorption coefficient and remarkable light sensitivity due to the low number of grain boundaries and high surface-to-volume ratio. To harvest photocurrent directly from supramolecular nanowires it is necessary to wire them up with nanoelectrodes that possess different work functions. However, devising strategies that can connect multiple nanowires at the same time has been challenging. Here, we report a general approach to simultaneously integrate hundreds of supramolecular nanowires of N,N'-dioctyl-3,4,9,10-perylenedicarboximide (PTCDI-C8) in a hexagonal nanomesh scaffold with asymmetric nanoelectrodes. Optimized PTCDI-C8 nanowire photovoltaic devices exhibit a signal-to-noise ratio approaching 10, a photoresponse time as fast as 10 ns and an external quantum efficiency >55%. This nanomesh scaffold can also be used to investigate the fundamental mechanism of photoelectrical conversion in other low-dimensional semiconducting nanostructures.
超分子有机纳线是光电应用的理想纳米结构，因为它们具有高吸收系数导致的高效激子产生，以及低晶界数量和高表面积与体积比导致的显著的光灵敏度。为了直接从超分子纳线中收集光电流，需要将其与具有不同功函数的纳米电极连接起来。然而，设计能够同时连接多个纳线的策略一直具有挑战性。在这里，我们报告了一种通用方法，可以同时将数百个 N,N'-二辛基-3,4,9,10-苝二酰亚胺（PTCDI-C8）超分子纳线集成到具有不对称纳米电极的六边形纳米网支架中。优化后的 PTCDI-C8 纳线光伏器件的信噪比接近 10，光响应时间快至 10 ns，外量子效率>55%。这种纳米网支架还可以用于研究其他低维半导体纳米结构中光电转换的基本机制。
