Interfacial Engineering of Organic Nanofibril Heterojunctions into Highly Photoconductive Materials,Journal of the American Chemical Society

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Interfacial Engineering of Organic Nanofibril Heterojunctions into Highly Photoconductive Materials
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2011-02-02 , DOI: 10.1021/ja109396g
Yanke Che ₁ , Helin Huang ₁ , Miao Xu ₁ , Chengyi Zhang ₁ , Benjamin R. Bunes ₁ , Xiaomei Yang ₁ , Ling Zang ₁

Affiliation

Photoconductive organic materials have gained increasing interest in various optoelectronics, such as sensors, photodetectors, and photovoltaics. However, the availability of such materials is very limited due to their intrinsic low charge carrier density and mobility. Here, we present a simple approach based on nanofibril heterojunction to achieve high photoconductivity with fast photoresponse, that is, interfacial engineering of electron donor (D) coating onto acceptor (A) nanofibers via optimization of hydrophobic interaction between long alkyl side-chains. Such nanofibril heterojunctions possess two prominent features that are critical for efficient photocurrent generation: the nanofibers both create a large D/A interface for increased charge separation and act as long-range transport pathways for photogenerated charge carriers toward the electrodes, and the alkyl groups employed not only enable effective surface adsorption of D molecules on the nanofibers for effective electron-transfer communication, but also spatially separate the photogenerated charge carriers to prevent their recombination. The reported approach represents a simple, adaptable method that allows for the development and optimization of photoconductive organic materials.

中文翻译：

有机纳米纤维异质结的界面工程化成高光导材料

光电导有机材料在各种光电子学中越来越受到关注，例如传感器、光电探测器和光伏器件。然而，由于其固有的低电荷载流子密度和迁移率，此类材料的可用性非常有限。在这里，我们提出了一种基于纳米原纤维异质结的简单方法，以实现具有快速光响应的高光电导率，即通过优化长烷基侧链之间的疏水相互作用，将电子供体（D）涂覆到受体（A）纳米纤维上的界面工程。这种纳米原纤维异质结具有两个对有效光电流产生至关重要的突出特征：纳米纤维既创造了一个大的 D/A 界面，以增加电荷分离，并作为光生电荷载流子向电极的长程传输途径，所使用的烷基不仅使 D 分子在纳米纤维上有效表面吸附以获得有效电子-转移通信，但也在空间上分离光生电荷载流子以防止它们复合。报告的方法代表了一种简单、适应性强的方法，可以开发和优化光电导有机材料。

更新日期：2011-02-02

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