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解锁高性能近红外光检测:极子辅助有机整数电荷转移混合动力

Muhammad Ahsan Iqbal^1,2,3,4, Xueqian Fang^5,6,7, Yasir Abbas⁸

¹School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan, 523808, China.

Light, science & applications

|December 8, 2024

概括

有机红外光探测器通过使用极子来增强电荷传输,达到femtowatt的灵敏度. 这一突破提供了高的外部量子效率 (EQE) 和与无机传感器相当的性能.

科学领域:

材料科学材料科学材料科学
有机电子有机电子
光子学是指光子学的使用方法.

背景情况:

有机红外 (IR) 光探测器 (PD) 对第四代工业时代至关重要,但落后于无机同行.
在有机IR PD中,外部量子效率 (EQE) 较差是由于高激子结合能和非辐射重组.
在室温下达到femtowatt灵敏度是IR光电探测器技术的一个关键目标.

研究的目的:

开发一款高性能有机近红外 (NIR) 光探测器 (PD),具有提高灵敏度和EQE.
探索整数电荷转移和极子激发的使用,以提高有机IRPD的性能.
为了证明极子在有机IR PD中作为弗伦克尔激子的替代品的潜力.

主要方法:

在Poly[2,5-bis(3-tetradecylthiophen-2-yl) thieno[3,2-b]thiophene] (C-14PBTTT) 供体和Tetrafluorotetracyanoquinodimethane (TCNQF4) 受体分子之间使用的整数电荷转移.
研究了混合D-A分子中的极子激发,以促进电荷解离.
制造和表征有机NIR PDs用于性能评估.

主要成果:

由于极子激发,获得了高外部量子效率 (EQE) ~10^7%.
在室温下,经证明的femtowatt灵敏度与噪声等效功率 (NEP) 为~0.12 fW Hz^-1/2 .
在波长为1.0微米时观察到~81毫秒的响应时间.

结论:

在有机D-A混合分子中的极龙激发显著提高了NIR PDs中的EQE.
开发的有机NIR PD在室温下表现出具有竞争力的性能,包括femtowatt灵敏度.
极子为Frenkel刺激子提供了一个有希望的替代品,用于推进高性能有机红外光探测器技术.

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