Stacked Dual‐Wavelength Near‐Infrared Organic Photodetectors
Stacked Dual‐Wavelength Near‐Infrared Organic Photodetectors
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DOI：
10.1002/adom.202001784
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发表时间：
2020-12
影响因子：
9
通讯作者：
Yazhong Wang;Bernhard Siegmund;Zheng Tang;Zaifei Ma;Jonas Kublitski;Shen Xing;Vasileios C. Nikolis;Sascha Ullbrich;Yungui Li;J. Benduhn;D. Spoltore;K. Vandewal;K. Leo
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文献类型：
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作者：
Yazhong Wang;Bernhard Siegmund;Zheng Tang;Zaifei Ma;Jonas Kublitski;Shen Xing;Vasileios C. Nikolis;Sascha Ullbrich;Yungui Li;J. Benduhn;D. Spoltore;K. Vandewal;K. Leo
有机近红外（NIR）探测器在生物医学、农业和制造业中具有潜在的应用，可以真实的实时、低成本地非接触地识别和量化材料。最近，基于嵌入Fabry-Pérot微腔的体异质结的电荷转移态吸收的可调谐窄带NIR传感器已经被证明。在这项工作中，这种类型的传感器通过将两个子腔堆叠在彼此的顶部而进一步小型化。由此产生的三端设备检测并区分两个特定波长的光子。通过改变每个子腔的厚度，两个子传感器的检测范围分别在790和1180以及1020和1435 nm之间独立调谐，半峰全宽范围在35和61 nm之间。采用传输矩阵建模来选择和优化在由子腔形成的耦合谐振器系统中具有抑制的串扰的器件架构，并且因此允许两个不同的谐振。这些堆叠式光电探测器为在宽NIR范围内可调的高度集成双信号光谱学铺平了道路。为了证明应用潜力，堆叠的双传感器用于确定水溶液中的乙醇浓度。
Organic near‐infrared (NIR) detectors have potential applications in biomedicine, agriculture, and manufacturing industries to identify and quantify materials contactless, in real time and at a low cost. Recently, tunable narrow‐band NIR sensors based on charge‐transfer state absorption of bulk‐heterojunctions embedded into Fabry‐Pérot micro‐cavities have been demonstrated. In this work, this type of sensor is further miniaturized by stacking two sub‐cavities on top of each other. The resulting three‐terminal device detects and distinguishes photons at two specific wavelengths. By varying the thickness of each sub‐cavity, the detection ranges of the two sub‐sensors are tuned independently between 790 and 1180, and 1020 and 1435 nm, respectively, with full‐width‐at‐half‐maxima ranging between 35 and 61 nm. Transfer matrix modeling is employed to select and optimize device architectures with a suppressed cross‐talk in the coupled resonator system formed by the sub‐cavities, and thus to allow for two distinct resonances. These stacked photodetectors pave the way for highly integrated, bi‐signal spectroscopy tunable over a broad NIR range. To demonstrate the application potential, the stacked dual sensor is used to determine the ethanol concentration in a water solution.