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首页> 外文期刊>Advanced Functional Materials >Ultranarrow Bandwidth Organic Photodiodes by Exchange Narrowing in Merocyanine H- and J-Aggregate Excitonic Systems
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Ultranarrow Bandwidth Organic Photodiodes by Exchange Narrowing in Merocyanine H- and J-Aggregate Excitonic Systems

机译：通过花椰菜H和J聚集体激子系统中的交换窄化实现超窄带宽有机光电二极管

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摘要

Ultranarrowband organic photodiodes (OPDs) are demonstrated for thin film solid state materials composed of tightly packed dipolar merocyanine dyes. For these dyes the packing arrangement can be controlled by the bulkiness of the donor substituent, leading to either strong H- or strong J-type exciton coupling in the interesting blue (H-aggregate) and NIR (J-aggregate) spectral ranges. Both bands are shown to arise from one single exciton band according to fluorescence measurements and are not just a mere consequence of different polymorphs within the same thin film. By fabrication of organic thin-film transistors, these dyes are demonstrated to exhibit hole transport behavior in spin-coated thin films. Moreover, when used as organic photodiodes in planar heterojunctions with C-60 fullerene, they show wavelength-selective photocurrents in the solid state with maximum external quantum efficiencies of up to 11% and ultranarrow bandwidths down to 30 nm. Thereby, narrowing the linewidths of optoelectronic functional materials by exciton coupling provides a powerful approach to produce ultranarrowband organic photodiodes.
机译：已证明超窄带有机光电二极管（OPD）可用于由紧密堆积的偶极子花青染料组成的薄膜固态材料。对于这些染料，堆积结构可以通过供体取代基的体积来控制，从而在令人感兴趣的蓝色（H聚集）和NIR（J聚集）光谱范围内产生强H型或强J型激子耦合。根据荧光测量结果，这两个谱带均显示为来自一个单一的激子谱带，而不仅仅是同一薄膜中不同多晶型物的结果。通过有机薄膜晶体管的制造，证明了这些染料在旋涂薄膜中表现出空穴传输行为。此外，当在具有C-60富勒烯的平面异质结中用作有机光电二极管时，它们显示出固态的波长选择光电流，最大外部量子效率高达11％，超窄带宽低至30 nm。因此，通过激子耦合使光电功能材料的线宽变窄提供了一种生产超窄带有机光电二极管的有效方法。

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