具有高探测率的自供电有机光电探测器，可通过暗电流减少实现近红外光探测,Advanced Functional Materials

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具有高探测率的自供电有机光电探测器，可通过暗电流减少实现近红外光探测
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2021-09-24 , DOI: 10.1002/adfm.202106326
Yanan Wei ₁ , Hao Chen ₁ , Tianhua Liu ₁ , Song Wang ₁ , Yihang Jiang ₂ , Yu Song ₃ , Jianqi Zhang ₄ , Xin Zhang ₁ , Guanghao Lu ₂ , Fei Huang ₃ , Zhixiang Wei ₄ , Hui Huang ₁

Affiliation

用于近红外 (NIR) 光检测的有机光电探测器 (OPD) 代表了用于光通信、环境监测、生物医学成像和传感的尖端技术。在此，通过顺序沉积（SD）方法构建了一系列具有高探测率的自供电OPD。由于垂直相分离结构，与共混铸造 (BC) 器件相比，SD 器件的暗电流 ( J _d ) 有效降低。令人印象深刻的是，基于D18 和Y6 系统的SD 器件的J _d值在0 V 时降低到2.1 × 10 ^-11 A cm ^-2，比BC 器件低两个数量级。该d* 由于暗电流的减少，SD 器件在不同偏置电压（0、-0.5、-1.0 和 -2.0 V）下的值优于 BC 器件的值，这源于其精细的垂直相分离结构SD 设备。机理研究表明，垂直相分离结构可以有效抑制不利的电荷注入，从而降低暗电流。此外，表面能被证明在光电流稳定性中起着关键作用。此外，柔性 OPD 在光体积描记测试中表现出优异的性能。

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Self-Powered Organic Photodetectors with High Detectivity for Near Infrared Light Detection Enabled by Dark Current Reduction

Organic photodetectors (OPDs) for near infrared (NIR) light detection represents cutting-edge technology for optical communication, environmental monitoring, biomedical imaging, and sensing. Herein, a series of self-powered OPDs with high detectivity are constructed by the sequential deposition (SD) method. The dark currents (J_d) of SD devices are effectively reduced in comparison to blend casting (BC) ones due to the vertical phase segregation structure. Impressively, the J_d values of SD devices based on D18 and Y6 system is reduced to be 2.1 × 10⁻¹¹ A cm⁻² at 0 V, which is two orders of magnitude lower than those of the BC devices. The D* value of the SD device is superior to that of BC device under different bias voltages (0, −0.5, −1.0, and −2.0 V) due to the reduction of dark current, which originates from the fine vertical phase separation structure of the SD device. The mechanism studies shows that the vertical phase segregation structure can effectively suppress the unfavorable charge injection, thus reducing the dark current. Also, the surface energy is proven to play a key role in the photocurrent stability. In addition, the flexible OPDs demonstrate excellent performance in photoplethysmography test.

更新日期：2021-09-24

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