2D Ruddlesden‐Popper Sn‐Based Perovskite Weak Light Detector for Image Transmission and Reflection Imaging

Abstract

Abstract2D Ruddlesden‐Popper Sn‐based perovskite has excellent optoelectronic properties and weak halide ion migration characteristics, making it an ideal candidate for weak light detection, which has great potential in light communication, and medical applications. Although Sn‐based perovskite photodetectors are developed, weak light detection is not demonstrated yet. Herein, a high‐performance self‐powered photodetector with the capability to detect ultra‐weak light signals is designed based on vertical PEA2SnI4/Si nanowires heterojunction. Due to the low dark current and high light absorption efficiency, the devices present a remarkable responsivity of 42.4 mA W−1, a high detectivity of 8 × 1011 Jones, and an ultralow noise current of 2.47 × 10−13 A Hz−1/2. Especially, the device exhibits a high on–off current ratio of 18.6 at light signals as low as 4.60 nW cm−2, revealing the capacity to detect ultra‐weak light. The device is applied as a signal receiver and realized image transmission in light communication system. Moreover, high‐resolution reflection imaging and multispectral imaging are obtained using the device as the sensor in the imaging system. These results reveal that 2D PEA2SnI4‐based self‐powered photodetectors with low‐noise current possess enormous potential in future weak light detection.

High Temperature Resistant Solar‐Blind Ultraviolet Photosensor for Neuromorphic Computing and Cryptography

“…Figure 2b depicts the dependence of photocurrent on the light intensity at 10 V, which can be fitted by the power law (I P = 𝛼•P 𝛽 ) with an exponent 𝛽 of 0.91, close to the ideal value (𝛽 = 1). [30] Figure 2c shows the spectral responsivity of the device under 10 V bias, which exhibits a sharp response peak of 67.5 A W −1 at 247 nm with a cutoff wavelength of 276 nm (defined as the wavelength where the responsivity drops to 1/e). The UV/visible rejection ratio (R 247 /R 400 ) is about 2.7 × 10 2 , indicating that the device has high spectral selectivity for solar-blind light.…”

Multicolor vision perception of flexible optoelectronic synapse with high sensitivity for skin sunburn warning

“…1(b) shows the crystal structure of the PEA 2 SnI 4 material; here, the PEA + (organic sheet) vertically surrounds the inorganic layer to form a two-dimensional (2D) layered structure, and the inorganic layer consists of monolithic Sn 2+ /I À octahedra with shared corners. 33,34 The Sn vacancies are randomly distributed in the crystal structure, and the presence of Sn vacancies ensures the memory of the light signal. 27 Fig.…”

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“…[88] The relevant strategies are summarized in Table 5. [87][88][89][90][91][92] Combining reflection imaging technology with computational spectrometers can generate high-resolution images of surfaces illuminated with different wavelengths of light to obtain the full spectrum information of a material, allowing for a more accurate determination of its chemical composition, structure, and other surface characteristics. However, when light reflects off the surface of an object, it inevitably produces scattering, which poses a considerable challenge to reflection spectrum imaging that must be overcome in the future.…”