Panchromatic All‐Polymer Photodetector with Tunable Polarization Sensitivity
Panchromatic All‐Polymer Photodetector with Tunable Polarization Sensitivity
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DOI：
10.1002/adom.201801346
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发表时间：
2018-12
影响因子：
9
通讯作者：
P. Sen;Ruonan Yang;J. Rech;Yuanxiang Feng;Carr Hoi Yi Ho;Jinsong Huang;F. So;R. J. Kline;W. You
中科院分区：
文献类型：
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作者：
P. Sen;Ruonan Yang;J. Rech;Yuanxiang Feng;Carr Hoi Yi Ho;Jinsong Huang;F. So;R. J. Kline;W. You
在本报告中，展示了一种对整个可见光谱的线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）组成的体异质结，它们具有互补的光谱吸收，从而在350至800 nm范围内有效检测。该共混膜具有良好的延展性，能够承受大于60%的大应变而不断裂。这使得薄膜承受较大的单轴应变，导致两种聚合物在平面内对齐，使薄膜具有光学各向异性和本质极化敏感性。用紫外可见光谱和掠射广角X射线散射对膜进行了表征，结果表明，两种聚合物在应变后具有相似的面内骨架排列，并保持了堆积顺序。薄膜被集成到器件中，并在线偏振光下进行表征。应变取向探测器在横向偏振光下的最大光电流各向异性为1.4，峰值响应率为0.21 A W−1，截止频率为3db≈1 kHz。所展示的性能可与当前最先进的全聚合物光电探测器相媲美，并具有偏振灵敏度的附加能力，从而提供了新的应用机会。
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.