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首页> 外文期刊>Chemistry: A European journal >Surface Architectures Built around Perylenediimide Stacks
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Surface Architectures Built around Perylenediimide Stacks

机译：围绕Per二酰亚胺叠层构建的表面架构

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摘要

Simple stacks of perylenediimides (PDIs) grown directly on solid surfaces are an intriguing starting point for the construction of multicomponent architectures because their intrinsic activity is already very high. The ability of PDI stacks to efficiently generate photocurrent originates from the strong absorption of visible light and the efficient transport of both electrons and holes after generation with light. The objective of this study was to explore whether or not the excellent performance of these remarkably simple single-channel photosystems could be further improved in more sophisticated multicomponent architectures. We report that the directional construction of strings of anions or cations along the PDI stacks does not significantly improve their activity; that is, the intrinsic activity of PDI stacks is too high to yield ion-gated photosystems. The directional construction of electron-and hole-transporting stacks of naphthalenediimides (NDIs) and oligothiophenes along the central PDI stack did not improve photocurrent generation under standard conditions either. However, the activity of double-channel photosystems increased with increasing thickness, whereas increasing charge recombination with single-channel PDI stacks resulted in decreasing activity with increasing length. Most efficient long-distance charge transport was found with double-channel photosystems composed of PDIs and NDIs. This finding suggests that over long distances, PDI stacks transport holes better than electrons, at least under the present conditions. Triple-channel photosystems built around PDI stacks with oligothiophenes and triphenylamines were less active, presumably because hole mobility in the added channels was inferior to that in the original PDI stacks, thus promoting charge recombination.
机译：直接在固体表面上生长的简单的of二酰亚胺（PDI）堆栈是构建多组件体系结构的有趣起点，因为它们的固有活性已经很高。 PDI堆栈有效产生光电流的能力源于可见光的强烈吸收以及光产生后电子和空穴的有效传输。这项研究的目的是探讨是否可以在更复杂的多组件体系结构中进一步改善这些非常简单的单通道光电系统的出色性能。我们报告说，沿着PDI堆栈定向排列的阴离子或阳离子串不会显着提高其活性。也就是说，PDI堆栈的固有活性太高，无法产生离子门控光系统。萘二酰亚胺（NDI）和低聚噻吩在中心条件下沿电子PDI堆栈的电子和空穴传输堆栈的定向构造在标准条件下也不能改善光电流的产生。但是，双通道光系统的活性随厚度的增加而增加，而与单通道PDI堆栈的电荷复合增加导致其活性随长度的增加而降低。使用由PDI和NDI组成的双通道光电系统发现了最有效的长距离电荷传输。这一发现表明，至少在目前条件下，PDI堆栈在长距离内的传输空穴要比电子传输的空穴要好。用低聚噻吩和三苯胺在PDI堆栈周围建立的三通道光系统活性较低，大概是因为添加的通道中的空穴迁移率低于原始PDI堆栈中的空穴迁移率，从而促进了电荷重组。

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