High-Sensitivity Organic Photodetector Based on Surface-Concentrated Nonfused Ring Electron Acceptor,Advanced Optical Materials

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High-Sensitivity Organic Photodetector Based on Surface-Concentrated Nonfused Ring Electron Acceptor
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2022-12-16 , DOI: 10.1002/adom.202202525
Min Soo Kim ₁ , Dou Luo ₂ , Woongsik Jang ₁ , Byung Gi Kim ₁ , Chengwei Shan ₂ , Aung Ko Ko Kyaw ₂ , Dong Hwan Wang ₁

Affiliation

Organic photodetectors (OPDs) with high photodetection abilities are essential requirements for ubiquitous light-sensing devices. This work presents a simple nonfused ring electron acceptor (NFREA) named “TPDC-4F” having optical bandgap of 1.42 eV, being designed as an efficient OPD via thickness control and additive engineering of the photosensitive layer. The optimized photosensitive layer composed of poly[(2,6-(4,8-bis(5-(2-ethylhexyl-3-fluoro)thiophen-2-yl)-benzo[1,2-b:4,5-b′]dithiophene))-alt-(5,5-(1′,3′-di-2-thienyl-5′,7′-bis(2-ethylhexyl)benzo[1′,2′-c:4′,5′-c′]dithiophene-4,8-dione))] (PM6) donors and TPDC-4F acceptors shows a dramatically suppressed dark current of 3.55 × 10⁻⁹ A cm⁻². Moreover, it shows improved photoelectric properties and fast charge transfer even though the photosensitive layer thickness is as large as 330 nm. OPDs based on the 330-nm-thick PM6:TPDC-4F with 1-chloronaphthalene additive exhibit a high specific detectivity (D*) of 1.27 × 10¹³ cm Hz^1/2 W⁻¹ at 800 nm and a linear dynamic range of 122 dB under a bias of −0.1 V. The device also exhibits fast rise and fall times of 6.81 and 5.41 µs, respectively. This work demonstrates that the NFREA-based OPDs offer competitive device performance compared to those based on fused-ring electron acceptors.

中文翻译：

基于表面浓集非稠环电子受体的高灵敏度有机光电探测器

具有高光电探测能力的有机光电探测器 (OPD) 是无处不在的光传感设备的基本要求。这项工作提出了一种名为“TPDC-4F”的简单非稠环电子受体 (NFREA)，其光学带隙为 1.42 eV，通过光敏层的厚度控制和增材工程设计为高效 OPD。由聚[(2,6-(4,8-双(5-(2-乙基己基-3-氟)噻吩-2-基)-苯并[1,2-b:4,5-)组成的优化感光层b']二噻吩))- alt -(5,5-(1',3'-二-2-噻吩基-5',7'-双(2-乙基己基)苯并[1',2'-c:4 ',5'-c']dithiophene-4,8-dione))] (PM6) 供体和 TPDC-4F 受体显示显着抑制的暗电流为 3.55 × 10 -9 ^A cm ^-2. 此外，即使光敏层厚度大至 330 nm，它也显示出改进的光电性能和快速的电荷转移。基于 330 nm 厚 PM6:TPDC-4F 和 1-氯萘添加剂的 OPD 在 800 nm 处表现出1.27 × 10 ¹³ cm Hz ^1/2 W ⁻¹的高比检测率 ( D *)和线性动态范围在 −0.1 V 偏置下为 122 dB。该器件还表现出分别为 6.81 和 5.41 µs 的快速上升和下降时间。这项工作表明，与基于稠环电子受体的 OPD 相比，基于 NFREA 的 OPD 提供了具有竞争力的设备性能。

更新日期：2022-12-16

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