Centre for Organic Photonics &Electronics, School of Mathematics and Physics and School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland 4072, Australia.
National Renewable Energy Laboratory, Golden, Colorado 80401, USA.
Nat Commun. 2015 Feb 27;6:6343. doi: 10.1038/ncomms7343.
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 material-agnostic and applicable to other disordered and polycrystalline semiconductors.
光谱选择性光探测对于全色和近红外（NIR）成象和机器视觉至关重要。如果没有输入滤波，传统的宽带吸收无机半导体无法实现这一点，而对于窄带吸收有机半导体，这尚未实现。我们展示了第一个半最大值全宽小于 100nm 的可见盲红和近红外光电探测器，其在关键响应指标方面具有最先进的性能。这些器件基于具有光学厚结的有机光电二极管。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为止表现出的最窄的近红外带光响应。在这种情况下，这些光电二极管的性能优于现有技术（输入滤波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整，并且适用于其他光谱窗口。此外，它与材料无关，可适用于其他无序和多晶半导体。
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