Polarization‐Sensitive Photodetector Using Patterned Perovskite Single‐Crystalline Thin Films

Abstract

Hybrid organic–inorganic perovskite single crystals, compared with their polycrystalline counterparts in thin films, are free from grain boundaries and have fewer defects, and therefore are promising in high‐performance optoelectronic devices. Recently, the crystal‐structure anisotropy in perovskites has been utilized to achieve polarization‐sensitive photodetectors. Here, it is shown that under 532 nm linearly polarized illumination, although MAPbBr3 (MA=CH3NH3+1) single crystals possess weak in‐plane anisotropy, nanogratings made on the crystal surface lead to high polarization photodetection sensitivity of ≈2.2 comparable with that of the isotropic perovskite crystals and nanowires, while enhancing both the photodetection responsivity and external quantum efficiency. The surface nanopattern induced polarization sensitivity may find interesting applications in future optoelectronic devices.

Strong Polarization Dependent Nonlinear Excitation of a Perovskite Nanocrystal Monolayer on a Chiral Dielectric Nanoantenna Array

“…In particular, the demonstrated strong fluorescence detected circular dichroism in the hybrid system holds great potential for constructing efficient perovskite based circularly polarized light (CPL) photodetectors. Compared to their linearly polarized counterparts, − the realization of CPL detectors is still in a beginning stage and thus far based on chiral perovskites with an intrinsically weak discrimination level. , …”

Recent Progress of Polarization‐Sensitive Perovskite Photodetectors

“…[97] Zhang et al used a nondestructive epitaxial growth method to fabricate nanopatterned MAPbBr 3 single crystal films and demonstrated the polarization sensitivity of corresponding PPDs (Figure 6a). [101] Under irradiation at 532 nm and a bias voltage of 10 V, the patterned device showed significant changes in photocurrent at different polarization angles compared with its flat counterpart, indicating that the surface grating introduces the anisotropic optoelectronics effect to PPDs (Figure 6b,c). In specific, when the light polarization direction is parallel to the grating axis, the photocurrent is the largest, and vice versa.…”

“…Since the wavelength of LPL is much larger than the diameter of the nanowire, the electric field with high-frequency variation can be simplified as an electrostatic field. [102] The polarized light detection sensitivity (≈2.2) achieved by nanopatterned [101] Copyright 2021, Wiley-VCH GmbH.…”

“…d) Simulated polarization dependence of optical absorption spectra of nanopatterned MAPbBr 3 single crystal thin film with line-height 200 nm at the wavelength of 532 nm. Reproduced with permission [101]. Copyright 2021, Wiley-VCH GmbH.…”

A high-performance polarization-sensitive and stable self-powered UV photodetector based on a dendritic crystal lead-free metal-halide CsCu2I3/GaN heterostructure

“…Polarization-sensitive photodetectors have attracted great interest because of their significant applications, such as in high-contrast polarizers, optical switches and interconnects, etc ., 1–6 which require photoactive materials with outstanding optoelectronic characteristics, and an anisotropic crystal structure or morphology. 1 However, most polarization-sensitive photodetectors still suffer from being external bias driven, low anisotropy ratio, complex processes and high costs, 7–9 which greatly limits their applications.…”