We investigate bulk heterojunction organic photodetectors with unbalanced charge carrier mobilities in the active layer. We present an experimental example of an organic photodiode with very unbalanced mobilities but achieving state-of-the-art parameters in terms of external quantum efficiency exceeding 75% (at illumination 638 nm), and of bandwidth exceeding 1 MHz. The active layer of the photodiode is a 50 nm thick bulk heterojunction made of a blend of PCBM and copolymer of 5,6-difluoro2,1,3-benzothiadiazole, with mobility of slower charge carriers of order of 5 × 10 −7 ##IMG## [http://ej.iop.org/images/0268-1242/35/10/104002/sstabaaebieqn1.gif] {$\mathrm{cm^{2}\ (Vs)^{-1}}$} , estimated using space-charge-limited photocurrent technique. To understand why such a low mobility does not have deteriorating effects on the photodetecting performance of the photodiode, we performed drift-diffusion simulations of bulk heterojunction photodiodes with Lan...

中文翻译：

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基于不平衡迁移率的聚合物共混物的有机体异质结光电探测器

我们研究在有源层中具有不平衡电荷载流子迁移率的体异质结有机光电探测器。我们提供了一个有机光电二极管的实验示例，该有机光电二极管具有非常不平衡的迁移率，但在外部量子效率超过75％（在638 nm的光照下）和带宽超过1 MHz方面达到了最先进的参数。光电二极管的有源层是50 nm厚的块状异质结，由PCBM和5,6-二氟2,1,3-苯并噻二唑的共聚物的混合物制成，迁移率较低的载流子约为5×10 -7 ## IMG ## [http://ej.iop.org/images/0268-1242/35/10/104002/sstabaaebieqn1.gif] {$ \ mathrm {cm ^ {2} \（Vs）^ {-1}} $}，是使用空间电荷受限的光电流技术估算的。