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Panchromatic All‐Polymer Photodetector with Tunable Polarization Sensitivity
Advanced Optical Materials ( IF 9 ) Pub Date : 2018-12-10 , DOI: 10.1002/adom.201801346
Pratik Sen 1 , Ruonan Yang 2 , Jeromy J. Rech 3 , Yuanxiang Feng 4 , Carr Hoi Yi Ho 5 , Jinsong Huang 4 , Franky So 5 , R. Joseph Kline 6 , Wei You 3 , Michael W. Kudenov 2 , Brendan T. O'Connor 1
Affiliation  

In this report, a high‐performance all‐polymer organic photodetector that is sensitive to linearly polarized light throughout the visible spectrum is demonstrated. The active layer is a bulk heterojunction composed of an electron donor polymer PBnDT‐FTAZ and acceptor polymer P(NDI2OD‐T2) that have complementary spectral absorption resulting in efficient detection from 350 to 800 nm. The blend film exhibits good ductility with the ability to accommodate large strains of over 60% without fracture. This allows the film to undergo large uniaxial strain resulting in in‐plane alignment of both polymers making the film optically anisotropic and intrinsically polarization sensitive. The films are characterized by UV–vis spectroscopy and grazing incidence wide‐angle X‐ray scattering showing that both polymers have similar in‐plane backbone alignment and maintain packing order after being strained. The films are integrated into devices and characterized under linear polarized light. The strain‐oriented detectors have maximum photocurrent anisotropies of 1.4 under transverse polarized light while maintaining peak responsivities of 0.21 A W−1 and a 3 dB cutoff frequency of ≈1 kHz. The demonstrated performance is comparable to the current state of the art all‐polymer photodetectors with the added capability of polarization sensitivity enabling new application opportunities.

中文翻译:

具有可调偏振灵敏度的全色全聚合物光电探测器

在本报告中,展示了对整个可见光谱中的线性偏振光敏感的高性能全聚合物有机光电探测器。活性层是由电子给体聚合物PBnDT-FTAZ和受体聚合物P(NDI2OD-T2)组成的块状异质结,它们具有互补的光谱吸收能力,可在350至800 nm范围内有效检测。共混膜表现出良好的延展性,能够承受超过60%的大应变而不会破裂。这允许薄膜承受较大的单轴应变,从而导致两种聚合物的面内排列,从而使薄膜具有光学各向异性和本征偏振特性。薄膜的特征在于紫外可见光谱和掠入射的广角X射线散射,表明两种聚合物的面内骨架排列相似,并且在拉伸后仍保持堆积顺序。薄膜被集成到设备中并在线性偏振光下表征。应变导向探测器在横向偏振光下具有最大1.4的光电流各向异性,同时保持0.21 AW的峰值响应度-1和3 dB截止频率≈1kHz。演示的性能可与当前的全聚合物光电探测器相媲美,并具有增加的偏振灵敏度功能,从而带来了新的应用机会。
更新日期:2018-12-10
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