Positive Trions in InP/ZnSe/ZnS Colloidal Nanocrystals.
Danil O TolmachevMark J FernéeElena V ShornikovaNikita V SiverinDmitri R YakovlevHannes Van AvermaetZeger HensManfred BayerPublished in: ACS nano (2024)
InP-based colloidal nanocrystals are being developed as an alternative to cadmium-based materials. However, their optical properties have not been widely studied. In this paper, the fundamental magneto-optical properties of InP/ZnSe/ZnS nanocrystals are investigated at cryogenic temperatures. Ensemble measurements using two-photon excitation spectroscopy revealed the band-edge hole state to have 1 S h symmetry, resolving some controversy on this issue. Single nanocrystal microphotoluminescence measurements provided increased spectral resolution that facilitated direct detection of the lowest energy confined acoustic phonon mode at 0.9 meV, which is several times smaller than the previously reported values for similar nanocrystals. Zeeman splitting of narrow spectral lines in a magnetic field indicated a bright trion emission. A simple trion model was used to identify a positive trion charge. Furthermore, the Zeeman split spectra allowed the direct measurement of both the electron and hole g -factors, which match existing theoretical predictions.
Keyphrases
- quantum dots
- energy transfer
- room temperature
- solar cells
- sensitive detection
- optical coherence tomography
- single molecule
- high resolution
- solid state
- loop mediated isothermal amplification
- perovskite solar cells
- heavy metals
- single cell
- mass spectrometry
- magnetic resonance imaging
- magnetic resonance
- living cells
- density functional theory
- ionic liquid
- machine learning
- real time pcr
- electron microscopy