Narrowband light detection via internal quantum efficiency manipulation of organic photodiodes
Narrowband light detection via internal quantum efficiency manipulation of organic photodiodes
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DOI：
10.1038/ncomms7343
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发表时间：
2015-02-01
影响因子：
16.6
通讯作者：
Meredith, Paul
中科院分区：
文献类型：
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作者：
Armin, Ardalan;Jansen-van Vuuren, Ross D.;Meredith, Paul
光谱选择性光检测对于全彩色和近红外(NIR)成像和机器视觉至关重要。这对于没有输入滤波的传统宽带吸收无机半导体是不可能的，而对于窄带吸收有机半导体则还无法实现。我们展示了第一款低于100 nm的半最大全宽可见盲红色和近红外光电探测器，在关键响应指标上具有最先进的性能。这些器件是以有机光电二极管为基础的，结非常厚。矛盾的是，我们使用宽带吸收有机半导体，并利用结的电光特性来创建迄今已证明的最窄的近红外波段光响应。在这种背景下，这些光电二极管的表现优于覆盖技术(输入过滤的无机半导体二极管)和新兴技术，如窄吸收有机半导体或量子纳米晶体。该设计概念允许响应调谐，并适用于其他光谱窗口。此外，它是材料不可知的，适用于其他无序和多晶半导体。
Spectrally selective light detection is vital for full-colour and near-infrared (NIR) imaging and machine vision. This is not possible with traditional broadband-absorbing inorganic semiconductors without input filtering, and is yet to be achieved for narrowband absorbing organic semiconductors. We demonstrate the first sub-100 nm full-width-at-half-maximum visible-blind red and NIR photodetectors with state-of-the-art performance across critical response metrics. These devices are based on organic photodiodes with optically thick junctions. Paradoxically, we use broadband-absorbing organic semiconductors and utilize the electro-optical properties of the junction to create the narrowest NIR-band photoresponses yet demonstrated. In this context, these photodiodes outperform the encumbent technology (input filtered inorganic semiconductor diodes) and emerging technologies such as narrow absorber organic semiconductors or quantum nanocrystals. The design concept allows for response tuning and is generic for other spectral windows. Furthermore, it is materialagnostic and applicable to other disordered and polycrystalline semiconductors.