Flexible near-infrared polarized photodetector based on CuPc single crystal grown by microspacing in-air sublimation

• Published in: Journal of materials chemistry. C, Materials for optical and electronic devices Vol. 11; no. 41; pp. 14456 - 14463
• Main Authors: Li, Mengru, Du, Qianqian, Zhang, Yanxun, Liu, Yunlong, Wang, Wenjun, Wang, Fengqiu, Qin, Shuchao
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 26.10.2023
• Subjects: Bending; Broadband; Charge transport; Crystal growth; Excitons; Image resolution; Near infrared radiation; Optoelectronic devices; Photometers; Polarization; Semiconductor crystals; Single crystals; Sublimation; Substrates; Transport properties
• ISSN: 2050-7526; 2050-7534
• DOI: 10.1039/d3tc03016d

Organic semiconductor crystals with outstanding intrinsic properties, such as great charge transport properties, long exciton lifetimes and diffusion lengths, provide new opportunities for fabricating high-performance optoelectronic devices. High-performance organic photodetectors have been demonstrated in both ultraviolet (UV) and visible regions, while there are some challenges in designing and fabricating high-performance near-infrared (NIR) photodetectors with polarization response. Herein, we demonstrate a high-performance organic phototransistor based on a CuPc single crystal grown by a simple air sublimation method. The device shows an excellent broadband response covering the UV and NIR range, and the NIR responsivity can reach up to 200 A W −1 at 785 nm, together with a good −3 dB bandwidth of ∼4 kHz. Intriguingly, this device exhibits excellent polarization detection performance and also achieves the special optical reversal from the visible region to the near-infrared range. Benefiting from its outstanding sensitivity and fast operation speed, we realized several high-resolution single-pixel images in the UV, visible and NIR ranges. Finally, remarkable mechanical flexibility and environmental robustness were also verified in the flexible device on a PET substrate, which retained good conductivity and stable photon detection after 1000 bending cycles even under severe bending conditions. The results suggest that the high-quality organic single crystal is a promising platform for future high-performance wearable polarized optoelectronics, and also suitable for high-speed imaging applications. Devices based on highly ordered CuPc single crystals shows an ultrahigh electronic bandwidth of ∼4 kHz and high-resolution, UV-NIR high-speed imaging capability.