Tunnel injection from WS₂ quantum dots to InGaN/GaN quantum wells

Abstract

In this manuscript, an effective tunnel-injection structure, in which the WS2 quantum dots (QDs) act as the electron injector and the InGaN quantum wells (QWs) act as the light emitters, separated by GaN barriers.

Density-Dependent Carrier Recombination in MoS2Quantum Dots and Its Implications for Luminescence Sensing of Ammonium Hydroxide

“…The PL decay of MoS 2 QDs was initially increased as p was increased to 0.53 × 10 12 cm –2 , but then decreased after p was further increased to 2.08 × 10 12 cm –2 . As shown by the solid lines of Figure a, the PL decay can be well fitted by a stretch exponential function: , where p is the carrier densities, k is the decay rate and β is the dispersive component. In a stretched exponential function, the average decay time ( τ PL ) can be obtained by the following: , where Γ is the Gamma function.…”

“…As shown by the solid lines of Figure a, the PL decay can be well fitted by a stretch exponential function: , where p is the carrier densities, k is the decay rate and β is the dispersive component. In a stretched exponential function, the average decay time ( τ PL ) can be obtained by the following: , where Γ is the Gamma function. The dependence of τ PL on p was obtained from eq , as plotted in Figure b.…”

Highly Efficient Photoelectrochemical Water Splitting Using GaN-Nanowire Photoanode with Tungsten Sulfides

“…29,32−35 Furthermore, since the electron affinity of W x S 1−x is similar to that of GaN, the photogenerated carriers at the GaN NWs are readily transferred to the CBM of W x S 1−x . 36,37 This indicates that GaN NWs with W x S 1−x (GaN-NW-W x S 1−x ) have the potential to work as a highly efficient photoanode for the PEC-WS.…”

“…In the current work, we have developed for the first time a highly efficient method for PEC-WS using GaN NWs covered with tungsten sulfide (W x S 1– x ) as a photoanode. W x S 1– x with an amorphous phase is considered as a promising cocatalyst because of its accelerated HER kinetics and reduced carrier recombination. ,− Furthermore, since the electron affinity of W x S 1– x is similar to that of GaN, the photogenerated carriers at the GaN NWs are readily transferred to the CBM of W x S 1– x . , This indicates that GaN NWs with W x S 1– x (GaN-NW-W x S 1– x ) have the potential to work as a highly efficient photoanode for the PEC-WS.…”