High-Performance Low-Voltage Flexible Photodetector Arrays Based on All-Solid-State Organic Electrochemical Transistors for Photosensing and Imaging,ACS Applied Materials & Interfaces

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High-Performance Low-Voltage Flexible Photodetector Arrays Based on All-Solid-State Organic Electrochemical Transistors for Photosensing and Imaging
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-05-10 00:00:00 , DOI: 10.1021/acsami.9b04486
Yujie Yan ₁ , Xiaomin Wu ₁ , Qizhen Chen ₁ , Yaqian Liu ₁ , Huipeng Chen ₁ , Tailiang Guo ₁

Affiliation

The identifying characteristic of an organic electrochemical transistor (OECT) is the coupling between ionic and electronic charges within the entire volume of the channel. In this work, by taking advantage of the volumetric nature of the OECTs’ response, a novel flexible photodetector is reported for the first time based on all-solid-state OECT with an excellent responsivity of up to 6.7 × 10⁶ A/W, detectivity as high as 3.6 × 10¹³ Jones, and a fast response of ∼0.13 s in the visible range, which are superior to those of the majority of the reported organic phototransistors (OPTs) based on field-effect transistors (FETs) and even better than those of FET-based phototransistors with two-dimensional (MoS₂ and graphene) and perovskite materials. The high performance of the devices was ascribed to the combination of the higher carrier mobility of poly(3,4-ethylenedioxythiophene) doped with poly(styrene sulfonate) (PEDOT:PSS) as a channel and the volumetric nature of the OECTs’ response, and the charge density of the volumetric channel was efficiently modulated by incident light compared to FETs. Moreover, OECT-based OPTs with quantum dots (CdSe/ZnS) as a light sensitizer were characterized under ultraviolet light, and they exhibited excellent photosensitivity, which further verified the superiority of OECT for phototransistors. Furthermore, a flexible image sensor was fabricated for the first time by integrating flexible OECTs-OPTs into a 10 × 10 array, which can clearly identify the target image under a bending state, indicating the great potential of OECTs-OPTs in the application of low-power, ultrasensitive flexible photodetectors and imaging technology.

中文翻译：

基于全固态有机电化学晶体管的高性能低压柔性光电探测器阵列，用于光敏和成像

有机电化学晶体管（OECT）的识别特性是通道整个体积内离子电荷和电子电荷之间的耦合。在这项工作中，通过利用OECTs响应的体积特性，首次报道了一种基于全固态OECT的新型柔性光电探测器，具有高达6.7×10 ⁶ A / W的出色响应度，探测灵敏度高达3.6×10 ¹³ Jones，在可见光范围内的响应速度约为〜0.13 s，优于大多数报道的基于场效应晶体管（FET）的有机光电晶体管（OPT）甚至是优于具有二维（MoS ₂的基于FET的光电晶体管和石墨烯）和钙钛矿材料。器件的高性能归因于掺杂了聚（苯乙烯磺酸盐）（PEDOT：PSS）的聚（3,4-乙撑二氧噻吩）的较高载流子迁移率和OECTs响应的体积性质，与FET相比，入射光有效地调制了体积沟道的电荷密度。此外，具有量子点（CdSe / ZnS）作为光敏剂的基于OECT的OPT在紫外光下得到了表征，并表现出优异的光敏性，这进一步证明了OECT在光电晶体管中的优越性。此外，通过将柔性OECTs-OPT集成到10×10阵列中，可以首次清晰地识别出弯曲状态下的目标图像，从而首次制造出了柔性图像传感器。

更新日期：2019-05-10

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