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首页> 外文期刊>Journal of physical chemistry letters >High-Performance Near-Infrared-Selective Thin Film Organic Photodiode Based on a Molecular Approach Targeted to Ideal Semiconductor Junctions
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High-Performance Near-Infrared-Selective Thin Film Organic Photodiode Based on a Molecular Approach Targeted to Ideal Semiconductor Junctions

机译：基于理想半导体结的分子方法的高性能近红外选择性薄膜有机光电二极管

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摘要

A molecular approach to achieve wide linear dynamic range (LDR) and near-infrared (NIR)-selective thin film organic photodiodes (OPDs) with high detectivity is reported. Comparative studies based on two NIR-selective polymers are systematically investigated: the commercially available poly[(4,4'-bis(2-ethylhexyl)cyclopenta[2,1-b:3,4-b']dithiophene)-alt-(benzo[c][1,2,5]thiadiazole)] (PCPDTBT) and the synthesized poly-[(4,4'-(bis(hexyldecylsulfanyl)methylene)cyclopenta[2,1-b:3,4-b']- dithiophene)-alt-(benzo[c][1,2,5]thiadiazole)] (PCPDTSBT). The introduction of sp(2)-hybridized side chains in the PCPDTSBT structure can improve chain planarity and thus intermolecular interactions, as confirmed by Raman spectroscopy and grazing incidence X-ray diffraction studies. The favorable crystalline orientation of PCPDTSBT leads to enhanced photocurrent and suppressed noise current, compared to that of PCPDTBT, followed by a sharp increase in the specific detectivity of PCPDTSBT-based NIR OPDs by 1.54 x 10(12) Jones. The physics behind PCPDTSBT is analyzed employing optical simulation, temperature-dependent junction analyses, and Mott-Schottky analysis. Furthermore, it is found that PCPDTSBT possesses an exceptional nonsaturation photocurrent, which leads to a wide LDR of 128 dB. This study shows the possibility of realizing thin film NIR-selective OPDs using synthetic approaches.
机译：报道了具有高探测率的宽线性动态范围（LDR）和近红外（NIR）和近红外（NIR） - 选择性薄膜有机光电二极管（OPDS）的分子方法。基于两种NIR选择聚合物的比较研究得到系统地研究：市售聚合物[（4,4'-双（2-乙基己基）环戊基[2,1-B：3,4-B']二噻吩） - （苯并[c] [1,2,5]噻二唑）]（PCPDTBT）和合成的聚 - [（4,4' - （双（己基二亚甲基）亚甲基）环戊类[2,1-B：3,4-B. '] - 二噻吩）-ALT-（苯并[c] [1,2,5]噻二唑）]（PCPDTSBT）。 PCPDTSBT结构中的SP（2） - 杂交侧链的引入可以改善链平坦性，从而通过拉曼光谱和放牧入射X射线衍射研究证实的分子间相互作用。与PCPDTBT相比，PCPDTSBT的有利晶体取向导致增强的光电流和抑制噪声电流，然后在基于PCPDTSBT的NIR OPLS的特定探测率急剧增加1.54 x 10（12）琼。分析了PCPDTSBT背后的物理学采用光学仿真，温度依赖的结分析和Mott-Schottky分析。此外，发现PCPDTSBT具有出色的非饱和光电流，这导致了128 dB的宽LDR。该研究表明，使用合成方法实现薄膜NIR选择性OPD的可能性。

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