Direct Polarimetric Image Sensor and Wide Spectral Response Based on Quasi‐1D Sb₂S₃ Nanowire

Abstract

Polarized photodetectors with wide spectral detection and ultra‐fast photoresponses based on anisotropic semiconductors have potential applications in military and civilian fields and have been widely studied in recent years. The dual advantages of low‐symmetry crystal structure and special electronic band‐structure make Sb2S3 the perfect choice for polarized photodetection. In this work, the optical, vibrational, and optoelectronic anisotropy of the high‐quality orthorhombic Sb2S3 nanowires are systematically investigated by experimental and theoretical studies. The metal‐semiconductor‐metal photodetectors based on a single Sb2S3 nanowire exhibit good polarization sensitivity in a broadband range from ultraviolet to near‐infrared (360 to 1550 nm) and the obtained maximum dichroic ratio is 2.54 at 638 nm. The polarization‐sensitive photocurrent mapping results show that the photocurrent is mainly derived from the Schottky junction at the interface between Au and Sb2S3. The effective separation of the photo‐generated carriers near the Schottky junction gives a photodetector response time of 470 µs. The direct polarimetric imaging demonstrates that the gray value of the image obtained by the imaging system is sensitive to the object's polarized direction. This natural sensitivity of the Sb2S3‐based photodetector to polarized objects makes it possible to image polarized objects directly as an image sensor.

Low‐Noise Dual‐Band Polarimetric Image Sensor Based on 1D Bi2S3 Nanowire

“…Recently, some low‐dimensional materials with intrinsic in‐plane anisotropy structure exhibit great potential to realize direct polarized photodetection without the use of polarization filters. [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 ] Nevertheless, there are three main hurdles for polarimetric image sensors to achieve high‐resolution imaging at multispectral. First, the controllable growth of large‐size low‐dimensional single crystals is still a challenge.…”

Flexible Image Sensors with Semiconducting Nanowires for Biomimic Visual Applications

“…For single NW imaging, Wei et al recently prepared high-quality Sb 2 S 3 NWs with excellent performance on polarized photodetection. [119] A nonpolarized image sensor based on single NW Sb 2 S 3 photodetector is successfully realized by using "U""C""A""S" image (764 Â 20 pixels), and then the direct polarization imaging is further explored. The results show that when the polarization direction of the object is parallel to the c-axis of the crystal, the gray value of the image is the highest.…”

Integrated polarization-sensitive amplification system for digital information transmission

“…This promotes detection and imaging, and polarized light communication can thus be realized to achieve confidential information transmission 3 , 4 . Therefore, polarization-sensitive photodetectors are widely utilized in various fields and are of great importance for industrial applications, national security, biological diagnosis, and astronomy 5 , 6 . Such applications require high polarization sensitivity to determine the number of effectively-recognized polarization angles.…”

“…In recent years, the rise of low-dimensional (LD) materials has opened up another way for high-performance photodetection, which benefits from the limit size limitation in thickness and the strong light–matter interaction 7 – 11 . More importantly, some LD materials with intrinsic in-plane anisotropic structures can potentially detect polarized light without polarizers 5 , 12 , 13 . Therefore, it is feasible to develop advanced polarization detection devices using in-plane anisotropic semiconductors.…”