Synthesis, photophysical properties and surface chemistry of chalcopyrite-type semiconductor nanocrystals

Abstract

This review gives an overview of the synthesis, photophysical properties, surface characterization/functionalization and some applications of chalcopyrite-type nanocrystals.

Aqueous Synthesis of DNA-Functionalized Near-Infrared AgInS2/ZnS Core/Shell Quantum Dots

“…17,39 However, we note that the line width of the obtained QDs (around 300 meV) is significantly narrower than that obtained with established heat-up syntheses. 17 The PL band centered at 760 nm that corresponds to the "slow injection" cQDs, is weakly photoluminescent (PLQY= 8 %). In contrast, the "fast injection" cQDs exhibit a PL band at shorter wavelength (710 nm) due to Ag-deficient composition, with significantly stronger photoluminescence (PLQY= 36 %).…”

“…The higher PLQY can be attributed to the higher crystallinity and to the higher density of defect states in the Ag-deficient cQDs. 17 In the absorption spectra (Fig. 2d) no apparent excitonic peak is visible but only a large shoulder centered at 420 nm for the "fast injection" cQDs and at 550 nm for "slow injection" cQDs.…”

Hydrothermal Synthesis of Aqueous-Soluble Copper Indium Sulfide Nanocrystals and Their Use in Quantum Dot Sensitized Solar Cells

“…The peak in the red-NIR region observed for the fraction CIS-1 can be likely ascribed to a radiative recombination, typically observed in CIS nanocrystals. It is now well-established that this transition involves photo-excited electrons delocalized in conduction band levels and holes localized in Cu-related intra-bandgap states (e.g., Cu vacancies) leading to radiative recombination with sub-bandgap energy [ 9 , 38 ]. To the contrary, the origin of the emission at lower wavelength (535 nm) is much less studied.…”

“…Aqueous synthesis also addresses ecological (avoiding toxic solvents) and economic (low temperatures, low cost) concerns related to NC syntheses in organics. Several methods have been proposed for CIS NCs [ 9 ], relying on classical heat-up approaches, using ambient pressure and standard heating [ 10 , 11 , 12 , 13 , 14 ], microwave heating [ 15 , 16 , 17 , 18 , 19 ], or hydrothermal [ 20 , 21 , 22 , 23 , 24 , 25 ] syntheses ( Table S1 ). The latter presents several advantages, such as the possibility to achieve higher temperatures yielding improved solubility of precursors and reaction products.…”

Copper Iron Sulfide Nanocrystal‐Bulk Silicon Heterojunctions for Broadband Photodetection

“…While Si has been used for visible (400–1100 nm) detectors, [ 13 ] CuFeS 2 has the potential for sensing a significantly broader 300–2500 nm wavelength window. [ 14–17 ] Unlike their constituent semiconductors, CuFeS 2 /Si heterojunctions sense radiation not just till 2500 nm, but also to wavelengths below the bandgap of either constituent through a slower photothermal response. We associate a heat capacity of 1.5 J K −1 at room temperature with typical devices and a dark current that varies as 0.7 µA K −1 at room temperature.…”