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- W4313649416 abstract "Small-size $mathrm{Pb}mathrm{S}$ colloidal quantum dots (CQDs) have achieved excellent performance in photoelectric conversion devices through the ligand-exchange method of mixed lead-halide passivation. However, with the increase of $mathrm{Pb}mathrm{S}$ CQD diameter, the proportion of (100) facets on the CQD surface increases and the original proportion of mixed lead-halide ligand cannot passivate (100) facets completely, which will introduce deep defects and deteriorate device performance. Here, we demonstrate an excessive ${mathrm{Pb}mathrm{Br}}_{2}$ concentration ligand strategy to sufficiently passivate large-size $mathrm{Pb}mathrm{S}$ CQDs with an absorption peak at 1300 nm. The first-principles calculation results suggest that ${mathrm{Br}}^{ensuremath{-}}$ can passivate (100) facets more efficiently compared with ${mathrm{I}}^{ensuremath{-}}$. With the increase of ${mathrm{Pb}mathrm{Br}}_{2}$ concentration (0--0.464 mmol/mL), both optical and electrical measurements imply that defects are effectively passivated, while carrier lifetime increases and dark-current density decreases. Finally, a device with specific detectivity of $5.22ifmmodetimeselsetexttimesfi{}{10}^{12}$ Jones is obtained. This passivation strategy can also be used in other large-size $mathrm{Pb}mathrm{S}$ CQDs (diameter >4 nm) to realize a better device performance." @default.
- W4313649416 created "2023-01-07" @default.
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- W4313649416 date "2023-01-06" @default.
- W4313649416 modified "2023-10-16" @default.
- W4313649416 title "Excess <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline overflow=scroll><mml:msub><mml:mrow><mml:mi>Pb</mml:mi><mml:mi>Br</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:math> Passivation of Large <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline overflow=scroll><mml:mrow><mml:mi>Pb</mml:mi><mml:mi mathvariant=normal>S</mml:mi></mml:mrow></mml:math> Colloidal Quantum Dots to Reduce Dark-Current Density for Near-Infrared Detection" @default.
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- W4313649416 doi "https://doi.org/10.1103/physrevapplied.19.014021" @default.
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