Black Phosphorus Quantum Dots as Hole Capturers in Group-VA Monoelemental Heterostructures for the Application of High-Performance Flexible Photodetectors

Abstract

Herein, black phosphorus (BP) quantum dots (QDs) with consistent sizes are loaded on bismuth (Bi) nanosheets (NSs) uniformly to serve as hole capturers in Group-VA monoelemental heterostructures via a facile sonication approach. The as-fabricated Bi NSs-BP QD-based photodetectors exhibit 4.6 μA/cm2 photocurrent density at applied 0.8 V bias potential, about 4.2 times enhancement compared to Bi NSs, which contributes to the construction of type-II heterojunctions that effectively restrain the recombination of electron–hole pair and accelerates the transfer rate of carriers. Additionally, the photocurrent density of Bi NSs-BP QD-based photodetectors reaches 100 nA/cm2 without external power supply, allowing fabricated devices to work normally in an emergency. Meanwhile, long-cycle stability measurements reveal 15% photocurrent density attenuation after 2000 bending times and 8.8% under 60° bending angles. This work proves that the introduction of BP QDs significantly improves the performance of the Bi-based photodetector and provides a novel strategy to construct flexible photodetectors.

Recent advances in single crystal narrow band-gap semiconductor nanomembranes and their flexible optoelectronic device applications: Ge, GeSn, InGaAs, and 2D materials

“…Y. Zhou et al also exhibited a superior flexible PD based on bismuth nanosheets-BP quantum dots heterojunctions by sonication-assisted LPE, achieving a photocurrent density of 4.6 mA cm À2 at an applied voltage of 0.8 V, and 100 nA cm À2 without external voltage. 145 (Fig. 9(b)) For the bending test, the device performance revealed the photocurrent density attenuation of 15% after 2000 times of bending and 8.8% under a bending angle of 601.…”

“…Copyright 2015, American Chemical Society. (b) Flexible Bi nanosheets-BP quantum dots PDs: (i) Device fabrication process, (ii) photocurrent density and responsivity, and (iii) temporal response 145. Reproduced with permission from 145.…”

Fabrication, material regulation, and healthcare applications of flexible photodetectors

“…Meanwhile, the surface oxidation and chemical modification or ligand exchange of QDs can be used to adjust their photoelectric properties. 40 Lead chalcogenide QDs (PbS, PbSe, etc.) have been widely used as active materials of flexible PDs due to their adjustable bandgap, simple preparation method, low cost, and good compatibility with flexible substrates.…”

“…Meanwhile, the surface oxidation and chemical modification or ligand exchange of QDs can be used to adjust their photoelectric properties. 40…”

Black Phosphorus Quantum Dots with Exposed (113) Planes on Chemiluminescent Luminol–K3Fe(CN)6 for Detection of Dopamine

“…Among various QDs, metal-free QDs, especially those of pure elements, have attracted widespread research attention because of their low toxicity and excellent properties. Black phosphorus quantum dots (BPQDs) exhibit extraordinary catalytic potential by virtue of their superb electronic conductivity and abundant active sites, , which have been applied in numerous fields. − Many investigations have indicated that the participation of BPQDs in the CL system has provided new avenues to promote the CL emission and expand the application range. − It was found in our previous work that the catalytic effect of BPQDs can significantly boost lucigenin CL, suggesting that BPQDs are promising nanomaterials for CL research . Nonetheless, most of the current CL systems still require an alkaline environment to achieve high-quality CL performance. ,− It should be noted that the strong alkaline conditions lead to a low signal/noise ratio and poor universality of the systems.…”