Organic Bulk Heterojunction Infrared Photodiodes for Imaging Out to 1300 nm
Organic Bulk Heterojunction Infrared Photodiodes for Imaging Out to 1300 nm
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DOI：
10.1021/acsaelm.9b00009
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发表时间：
2019-04
影响因子：
4.7
通讯作者：
W. Yao;Zhenghui Wu;Eric Huang;Lifeng Huang;A. E. London;Zhaowei Liu;J. Azoulay;T. Ng
中科院分区：
文献类型：
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作者：
W. Yao;Zhenghui Wu;Eric Huang;Lifeng Huang;A. E. London;Zhaowei Liu;J. Azoulay;T. Ng
这项工作研究了具有宽光谱范围的有机本体异质结光电二极管，能够在短波红外中成像达 1.3 μm。供体与受体（聚合物：富勒烯）比例的调整显示了共混成分如何影响态密度（DOS），态密度将材料成分和光电特性联系起来，并提供了对与了解窄带隙器件中色散传输和重组相关的特征的深入了解。电容光谱和瞬态光电流测量表明，主要的复合机制源于深陷阱和累积空间电荷的提取不良。空间电荷量随着受主浓度的降低而减少；然而，这种减少被陷阱 DOS 的增加所抵消。施主与受主比例为 1:3 的器件在不同的共混成分中显示出最低的深陷阱密度和最高的外量子效率。有机光电二极管用于演示单像素...
This work studies organic bulk heterojunction photodiodes with a wide spectral range capable of imaging out to 1.3 μm in the shortwave infrared. Adjustment of the donor-to-acceptor (polymer:fullerene) ratio shows how blend composition affects the density of states (DOS) which connects materials composition and optoelectronic properties and provides insight into features relevant to understanding dispersive transport and recombination in the narrow bandgap devices. Capacitance spectroscopy and transient photocurrent measurements indicate the main recombination mechanisms arise from deep traps and poor extraction from accumulated space charges. The amount of space charge is reduced with a decreasing acceptor concentration; however, this reduction is offset by an increasing trap DOS. A device with 1:3 donor-to-acceptor ratio shows the lowest density of deep traps and the highest external quantum efficiency among the different blend compositions. The organic photodiodes are used to demonstrate a single-pixel ...