Spectroscopic near-infrared photodetectors enabled by strong light-matter coupling in (6,5) single-walled carbon nanotubes.
Spectroscopic near-infrared photodetectors enabled by strong light-matter coupling in (6,5) single-walled carbon nanotubes.
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DOI：
10.1063/5.0031293
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发表时间：
2020-11
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通讯作者：
A. Mischok;Jan Lüttgens;Felix J. Berger;Sabina Hillebrandt;F. Tenopala‐Carmona;Seonil Kwon;Caroline Murawski;Bernhard Siegmund;J. Zaumseil;M. Gather
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作者：
A. Mischok;Jan Lüttgens;Felix J. Berger;Sabina Hillebrandt;F. Tenopala‐Carmona;Seonil Kwon;Caroline Murawski;Bernhard Siegmund;J. Zaumseil;M. Gather
强的光-物质耦合导致混合激子-极化激元态的形成，允许严格操纵激子材料的吸收和发射。在这里，我们展示了实现这一有前途的概念，在有机光电探测器。通过将半导体（6，5）单壁碳纳米管（SWNTs）的E11激子与近红外腔光子杂交，我们在光电二极管内创建了光谱可调谐的极化激元态。反过来，我们能够红移与较低的极化激元带相一致的检测峰。我们的光电二极管包括一个金属腔，以介导光和SWNT之间的强耦合，并分别利用P3 HT和PC 70 BM作为电子供体和受体。通过混合SWNT、P3 HT和PC 70 BM以产生本体异质结或通过顺序处理层以形成平坦异质结来形成二极管。由此产生的近红外传感器在1000 nm和1300 nm之间的应用相关波长范围内显示出可调谐的、有效的激子捕获，光学模拟显示出可能超过1500 nm的扩展。
Strong light-matter coupling leads to the formation of mixed exciton-polariton states, allowing for a rigorous manipulation of the absorption and emission of excitonic materials. Here, we demonstrate the realization of this promising concept in organic photodetectors. By hybridizing the E11 exciton of semiconducting (6,5) single-walled carbon nanotubes (SWNTs) with near-infrared cavity photons, we create spectrally tunable polariton states within a photodiode. In turn, we are able to red-shift the detection peak that coincides with the lower polariton band. Our photodiodes comprise a metal cavity to mediate strong coupling between light and SWNTs and utilize P3HT and PC70BM as the electron donor and acceptor, respectively. The diodes are formed either via mixing of SWNTs, P3HT, and PC70BM to create a bulk heterojunction or by sequential processing of layers to form flat heterojunctions. The resulting near-infrared sensors show tunable, efficient exciton harvesting in an application-relevant wavelength range between 1000 nm and 1300 nm, with optical simulations showing a possible extension beyond 1500 nm.