Multiwavelength Photodetectors Based on an Azobenzene Polymeric Ionic Liquid
Multiwavelength Photodetectors Based on an Azobenzene Polymeric Ionic Liquid
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DOI：
10.1021/acsapm.1c00884
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发表时间：
2021-09
影响因子：
5
通讯作者：
A. Scheuermann;Hiba Wakidi;A. Lill;Saejin Oh;Luana C Llanes;Colton A. D'Ambra;Ségolène Antoine;Ming Wang;M. Chabinyc;Thuc‐Quyen Nguyen;Javier Read de Alaniz;Christopher M. Bates
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文献类型：
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作者：
A. Scheuermann;Hiba Wakidi;A. Lill;Saejin Oh;Luana C Llanes;Colton A. D'Ambra;Ségolène Antoine;Ming Wang;M. Chabinyc;Thuc‐Quyen Nguyen;Javier Read de Alaniz;Christopher M. Bates
有机光电探测器（OPD）是一类很有前途的光探测器件，它可以用简单的制造技术从各种各样的化学构件中制造出来。虽然分子光开关通常用于通过可逆异构化或电荷转移来调制这些器件的特性，但这种响应行为通常限于小范围的波长。本文报道了偶氮苯聚合物离子液体（PIL）与半导体聚合物聚{（4，4-双十六烷基-4H-环戊二烯并[1，2-B：5，4-B′]二噻吩-2，6-二基）-alt-（2，3-二氟-1，4-亚苯基）}（PhF-2，3）组成的双分子层多波长光电探测器的特性。紫外光和可见光都能在10 s内使恒压下的电流增加102- 103倍，而当光源关闭时，电流立即衰减。这种光介导的性能在多个开/关循环中具有抗疲劳性，并且可以用远至可见光区域（660和700 nm）的波长进行调制。前线能级计算的光诱导电荷载流子密度表明，这种光响应的电流增加是由于光激发和随后的电荷转移过程之间的偶氮苯聚合物离子液体和半导体聚合物。总之，本报告中描述的设备显示出与偶氮苯吸收曲线对应的多个波长的光的传感能力。
Organic photodetectors (OPDs) are a promising class of light-detecting devices that can be created with simple fabrication techniques from a large variety of chemical building blocks. While molecular photoswitches are commonly used to modulate the properties of these devices through reversible isomerization or charge transfer, this responsive behavior is typically limited to a small range of wavelengths. Here, we report the characteristics of multiwavelength photodetectors using bilayers of a light-responsive azobenzene polymeric ionic liquid (PIL) in conjunction with the semiconducting polymer poly{(4,4-dihexadecyl-4H-cyclopenta[1,2-b:5,4-b′]dithiophene-2,6-diyl)-alt-(2,3-difluoro-1,4-phenylene)} (PhF-2,3). Both ultraviolet (UV) and visible light induce a 102–103increase in current at a constant voltage within 10 s, which decays immediately when the light is turned off. This light-mediated performance is fatigue-resistant across multiple ON/OFF cycles and can be modulated with wavelengths far into the visible region (660 and 700 nm). Frontier energy level calculations of the light-induced charge carrier density indicate that this light-responsive increase in current is due to photoexcitation and a subsequent charge-transfer process between the azobenzene polymeric ionic liquid and the semiconducting polymer. In summary, the device described in this report exhibits sensing capabilities for multiple wavelengths of light corresponding with the azobenzene absorption profile.