Lead-Free Perovskite Nanoflake/Monoradicular CdSe Nanobelt Hybrid Nanostructures for Ultrasensitive Broadband Photodetectors

Abstract

Lead halide perovskites have drawn extensive attention on account of their fundamental role in the field of photoelectric detection. Nevertheless, the existence of toxic lead ions and the instability of lead-based perovskites greatly hamper their applications in mass production and commercialization. Herein, a hybrid photodetector based on the lead-free inorganic perovskite nanoflake (Cs 3 Sb 2 Br 9 NF)/monoradicular CdSe nanobelt (NB) has been successfully prepared. The hybrid nanostructures promote the effective separation of electron−hole pairs, thus dramatically improving the photoelectric performance. Meanwhile, the Cs 3 Sb 2 Br 9 NF/CdSe NB photodetector possesses a wideband spectral response from 300 to 780 nm and shows a higher responsivity (174 A/W), external quantum efficiency (4.8 × 10 4 %), and photodetectivity (1.1 × 10 14 Jones) under 448 nm illumination. Overall, these superior photoelectric properties confirm that the Cs 3 Sb 2 Br 9 NF/CdSe NB is a kind of hybrid optoelectronic device with practical application in civilian and military fields.

2D/1D PbI2/Sb2S3 van der Waals heterojunction for highly sensitive and broadband photodetectors

“…The θ can be fitted to be 0.54 and 0.58 for the PbI 2 and PbI 2 /Sb 2 S 3 devices, respectively, under irradiation at a power of 300 μW under 445 nm, suggesting a complicated process of photogenerated electron–hole pair trapping and recombination within the photochromic range. 42 Note that spectral responsivity ( R λ ), 43 external quantum efficiency (EQE), 44 and specific detectivity ( D *) 45 are three important parameters of photodetectors. These parameters can be calculated by the following formulas: R λ = I P / P opt where I P is the photocurrent, P opt is the incident light power density, h is Planck's constant, c is the speed of light in vacuum, q is the elementary charge, λ is the incident light wavelength, η is the quantum efficiency, A represents the device area, Δ f denotes the bandwidth, and NEP stands for the noise equivalent power.…”

“…The y can be fitted to be 0.54 and 0.58 for the PbI 2 and PbI 2 / Sb 2 S 3 devices, respectively, under irradiation at a power of 300 mW under 445 nm, suggesting a complicated process of photogenerated electron-hole pair trapping and recombination within the photochromic range. 42 Note that spectral responsivity (R l ), 43 external quantum efficiency (EQE), 44 and specific detectivity (D*) 45 are three important parameters of photodetectors. These parameters can be calculated by the following formulas:…”

Hybrid Polyrhizal CdS Nanobelts/All‐Inorganic Perovskite Nanoflake Heterojunction toward Ultrahigh‐Performance Optoelectronic Devices

“…[ 37 ] Meanwhile, the hybrid Cs 3 Sb 2 Br 9 nanoflake/CdSe nanobelt device has also been prepared to promote the optoelectronic detective properties due to the large absorption coefficient of Cs 3 Sb 2 Br 9 to light. [ 38 ] But the small contact area between them limits their greatest advantage of hybrid device components.…”