CdS@CdSe Core/Shell Quantum Dots for Highly Improved Self-Powered Photodetection Performance

Abstract

Uniform, well-defined cadmium sulfide@cadmium selenide core/shell quantum dots (CdS@CdSe QDs) were, for the first time, successfully synthesized by a solvothermal method and chemical bath growth for photoelectrochemical activities. The as-synthesized CdS@CdSe QDs not only exhibit superior self-powered photoresponse behavior and excellent stability under ambient conditions but also display significantly improved current densities and photoresponsivity compared to those of individual CdS QDs or CdSe QDs, mainly due to the built-in electric field, and thus have great potential in the fields of renewable energy and renewable energy consumption for carbon neutrality target achievement.

Tin Oxide (SnO2) Nanoparticles: Facile Fabrication, Characterization, and Application in UV Photodetectors

“…The highest R value reached 0.10 µA W −1 , which is comparable to those of black phosphorus nanosheets (2.2 µA W −1 ) [11] and tellurene (3.0 µA W −1 ) [12]. It should be noted that the much larger P λ of SL employed in this work leads to low values of R compared to those reported in other studies [6,42].…”

Recent Progress in Interface Engineering of Nanostructures for Photoelectrochemical Energy Harvesting Applications

“…Figure 10k shows that the self‐powered PEC signal of the as‐fabricated Te 0.37 @Se 0.63 ‐based photoelectrode is significantly stronger than that of individual Te NT or Se NS‐based photoelectrode, which can be mainly attributed to the built‐in electric field in the heterostructure as a driving force to prominently promote the separation of the photogenerated e − – h + pairs and thus meets the requirements of energy‐saving. [ 180,194 ] The size influence of Te@Se on the PEC performance (Figure 10l) shows that the I of the Te@Se‐based photoelectrode increases with the Se content in all the studied electrolytes, e.g., in 0.5 m KOH at 118 mW cm −2 , the I s of Te NTs, Te 0.44 @Se 0.56 and Te 0.37 @Se 0.63 ‐based photoelectrodes are 0.412 µA cm −2 , 7.85 µA cm −2 , and 11.9 µA cm −2 , respectively. Apart from Te@Se, many heterostructures, such as CdS@CdSe core/shell QD‐based heterostructures, [ 180 ] Bi 2 Se 3 /Te@Se‐based heterostructures, [ 195 ] 1D Te NT@0D Bi QD‐based heterostructures, [ 196 ] have been rationally designed to significantly improved PEC performance in comparison to individual components, suggesting that the well‐defined heterostructures can offer an unprecedented opportunity for new designs of next‐generation energy‐efficient and large‐scale optoelectronic nanosystems.…”

“…[180,194] The size influence of Te@Se on the PEC performance (Figure 10l) shows that the I of the Te@Se-based photoelectrode increases with the Se content in all the studied electrolytes, e.g., in 0.5 m KOH at 118 mW cm −2 , the Is of Te NTs, Te 0.44 @Se 0.56 and Te 0.37 @Se 0.63 -based photoelectrodes are 0.412 µA cm −2 , 7.85 µA cm −2 , and 11.9 µA cm −2 , respectively. Apart from Te@Se, many heterostructures, such as CdS@CdSe core/shell QD-based heterostructures, [180] Bi 2 Se 3 / Te@Se-based heterostructures, [195] 1D Te NT@0D Bi QD-based heterostructures, [196] have been rationally designed to significantly improved PEC performance in comparison to individual components, suggesting that the well-defined heterostructures can offer an unprecedented opportunity for new designs of next-generation energy-efficient and large-scale optoelectronic nanosystems.…”

Micro Spectrometers Based on Materials Nanoarchitectonics

“…Thus, QDs have fine spectral responses over a wide wavelength range. For example, by tuning the particle size, the optical response of cadmium chalcogenide QDs [ 23 , 24 , 25 , 26 , 27 ] could cover the visible wavelength, while lead [ 28 , 29 , 30 , 31 ] or mercury chalcogenide QDs [ 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 ] could cover infrared regions to the terahertz region. Due to this property, QDs are excellent for identifying colors or the spectra of matter.…”