Visible and Near-Infrared Imaging with Nonfullerene-Based Photodetectors
Visible and Near-Infrared Imaging with Nonfullerene-Based Photodetectors
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DOI：
10.1002/admt.201800104
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发表时间：
2018-07-01
影响因子：
6.8
通讯作者：
Brabec, Christoph J.
中科院分区：
文献类型：
--
作者：
Gasparini, Nicola;Gregori, Alberto;Brabec, Christoph J.
溶液处理有机光电探测器是一项新兴技术的基础，在生物传感器和成像显示中具有固有的含义。传统的有机光电二极管是有机光电探测器的核心元件，主要依赖于富勒烯受体，它与高和中等带隙供体结合，将光谱光敏性限制在可见光范围内。即使在低带隙聚合物的情况下，由于分子轨道杂化的性质，振荡器强度和消光系数通常在近红外波段受到限制。相反，研究表明，将典型的聚（3-己基噻吩）（P3 HT）与罗丹宁-苯并噻唑偶联的吲哚二噻吩（IDTBR）配对，这是一种吸收750 nm以外的非富勒烯电子受体，由于简单光电二极管的光活性材料产生了一个高效率的有机光电探测器，其记录响应率为0.42 a W-1，近红外（755 nm）的外量子效率（EQE）为69%。非富勒烯基光电二极管在非晶硅有源矩阵衬底上加工，实现了能够在可见光和近红外光条件下检测物体的大面积平板光电探测器成像仪，具有卓越的响应率组合。动态响应与图像串扰。
The solution-processed organic photodetectors underpin an emerging technology with inherent implications in the biological sensors and imaging displays. Conventional organic photodiodes, the core element of an organic photodetector, rely mainly on fullerene-based acceptors, which in combination with high and middle bandgap donors, limit the spectral photosensitivity to the visible range. Even in the case of low bandgap polymers the oscillator strength and thus the extinction coefficient are usually limited in the NIR due to the nature of molecular orbital hybridization. Instead, it is showed that pairing prototypical poly(3-hexylthiophene) (P3 HT) with rhodanine-benzothiadiazolecoupled indacenodithiophene (IDTBR), a nonfullerene electron acceptor absorbing beyond 750 nm, as the photoactive material of a simple photodiode results in a highly efficient organic photodetector with a record responsivity of 0.42 A W-1 and external quantum efficiency (EQE) of 69% in the NIR (755 nm) Nonfullerene-based photodiodes are processed on amorphous silicon active matrix backplanes to realize large area flat panel photodetector imagers able to detect objects under visible and NIR light conditions with an exceptional combination of responsivity, dynamic response and image crosstalk.