Strongly Anisotropic Quasi‐1D BaTiS₃ Chalcogenide Perovskite for Near‐Infrared Polarized Photodetection

Abstract

One‐dimensional (1D) crystal‐structural materials have attracted extensive attention for polarization detection because of the strong anisotropy. Barium titanium sulfide (BaTiS3), a quasi‐1D chalcogenide perovskite, demonstrates a great potential for polarization detection stemming from the giant optical anisotropy. Whereas, the photoelectric properties of BaTiS3 and its direct application in polarized photodetector are less studied. Herein, quasi‐1D BaTiS3 is introduced in polarized photodetection for the first time. The needle‐like BaTiS3 single crystals are successfully prepared by a modified chemical vapor transport process. The BaTiS3 single crystal demonstrates a narrow bandgap of 0.8 eV, an n‐type intrinsic conductivity, and a more than 300 cm2 V−1 s−1 mobility along the c‐axis. Then, an Ag/BaTiS3/Ag photoconductive detector is fabricated. It shows a broad detection wavelength ranging from visual light to 1550 nm and high responsivity of ≈1.22 A W−1. Moreover, an orthogonal reverse property of polarization photocurrent is observed under the excitation energy of 1.70 eV and 1.96 eV. These comprehensive characteristics can promote the application of the quasi‐1D BaTiS3 in near‐infrared polarized photodetection.

Spectrally Selective Polarization-Sensitive Photodetection Based on a 1D Lead-Free Hybrid Perovskite Ferroelectric

“…For instance, the detector based on BP shows uniform photocurrents in the wide band range of 400 to 1700 nm . Different from the traditional photodetectors above, spectrally selective polarization photodetector can provide a dynamically adjustable response with the change of the incident wavelength of the light, which will have a good application prospect in future miniaturized and integrated LPL detection. − Linear dichroic (LD) conversion, which appears as a reversal of anisotropic absorption signals on the absorption spectrum, has been shown to achieve such wavelength-selective photodetectors. − However, few cases have been reported so far and all of them are inorganic systems, such as BaTiS 3 , GeAs, and PdPS . The practical application of these inorganic compounds often suffers from high cost, a complicated preparation process, and complex equipment integration.…”

“…14−17 Linear dichroic (LD) conversion, which appears as a reversal of anisotropic absorption signals on the absorption spectrum, has been shown to achieve such wavelength-selective photodetectors. 17−20 However, few cases have been reported so far and all of them are inorganic systems, such as BaTiS 3 , 18 GeAs, 17 and PdPS. 19 The practical application of these inorganic compounds often suffers from high cost, a complicated preparation process, and complex equipment integration.…”

Nanoimprinted Quasi‐2D Perovskites toward High‐Performance Polarization‐Sensitive Photodetectors

“…The responsivity, detectivity, response time, and anisotropy ratio are higher than most previously reported perovskite polarization-sensitive photodetectors. [16,18,19,[40][41][42][43][44][45]]…”

Ultrabroadband High Photoresponsivity at Room Temperature Based on Quasi‐1D Pseudogap System (TaSe4)2I

“…[41] Though the response time is relatively slow at present stage, on one hand, there's often a trade-off between responsivity and response time, the defects of the sample could be reduced by further iodization treatment through annealing in iodine atmosphere. [42] On the other hand, beyond photodetection application, the fall time with a relative long tail ≈20 s was observed due to the charge de-trapping process, the persistent photoconductivity (PPC) phenomenon could be exploited for novel optoelectronic synapses and optical memory application. [43] Although not all the parameters bear the best values, the proposed new type of broadband photodetector based on quasi-1D PG system, may provide a new route to achieve uncooled high-performance broadband photodetector.…”