Advanced MaterialsandAdvanced Functional Materials reportthe research work from Laboratory of Advanced Display Materials and Devices in the Field of sensing

Recently, the internationally famous journal Advanced Materials (IF~27)reports the research work of Polarized Photons sensing and imaging from MIIT (Ministry of Industry and Information Technology) Key Laboratory of Advanced Display Materials and Devices withthe title of “Oriented Perovskite Growth Regulation Enables Sensitive Broadband Detection and Imaging of Polarized Photons Covering 300-1050 nm(publication link:”.

Polarization photodetector empowers the breakthrough in sensing technology for target identification. Generally, the realization of polarization photodetector relying on intrinsically anisotropic crystal structure or extrinsically anisotropic device pattern requires complicated epitaxy and etching processes, which imposes the impediment for realizing scale-up manufacture and universal application. In this work, solution-processed PEA2MA4(Sn0.5Pb0.5)5I16 polycrystalline film is explored as photoactive layer toward sensing polarized photon from 300 nm to 1050 nm. With the assistance of NH4SCN and NH4Cl, PEA2MA4(Sn0.5Pb0.5)5I16 crystal grows in confined crystallographic orientation of (202) facet enhancing anisotropic photoelectric properties. As a result, our photodetector achieves a polarization ratio of 0.41, along with dichroism ratio (Imax/Imin) of 2.4 at 900 nm. At 520 nm, the dichroism ratio of 1.8 even surpasses perovskite crystal film (~1.2). More importantly, the superior figure-of-merits possess response width of 900 kHz, Ion/Ioff ratio of ~3×108, linear dynamic range (LDR) from 0.15 nW to 12 mW, noise current of 8.28×10-13 A×Hz-0.5 and specific detectivity (D*) of 1.53×1012 Jones demonstrating its advance in high-resolution and high-speed for weak signal sensing and imaging. The proof-of-concept in polarized imaging (Figure1) confirms that our low-cost polarization photodetector meets the request of practical application for accurate target recognition.

Figure 1. Proof-of-concept imaging of the device. a) The selected imaging target for detection. b) Imaging result when the incident light direction is 0 polarized and c) 90 polarized.

Almost at the same time, the internationally famous journal Advanced Functional Materials (IF~16.8) reports the Review paper from Key Laboratory of Advanced Display Materials and Devices with the title of “Perovskite Single Crystals: Synthesis, Optoelectronic Properties, and Application (”.