研究目的
Investigating the absorption cross section of colloidal lead halide perovskite quantum dots to understand their photophysical properties.
研究成果
The reliable absorption cross section of lead halide perovskite QDs is obtained from both elemental analysis and TA saturation methods. The absorption cross section determined by these methods is consistent and of the same order of magnitude as those of II-VI QDs of similar volume. The transient PL saturation method underestimates the absorption cross section by an order of magnitude.
研究不足
The accuracy of the elemental analysis method depends on the quality of information on the size and shape of the nanocrystal and its surface structure. The PL saturation method can underestimate the absorption cross section when a spatially nonuniform excitation beam is used.
1：Experimental Design and Method Selection:
The study employed elemental analysis and transient absorption (TA) saturation methods to measure the absorption cross section of CsPbBr3 quantum dots (QDs).
2：Sample Selection and Data Sources:
Monodisperse cube-shaped colloidal CsPbBr3 QDs with edge lengths from
3：8 nm to 9 nm were synthesized. List of Experimental Equipment and Materials:
Transmission electron microscope (TEM), inductively coupled plasma mass spectrometry (ICP-MS), transient absorption spectrometer, titanium-sapphire amplifier, β-barium borate (BBO) crystal, white light supercontinuum probe, amplified Si photodiodes, monochromator, quartz flow cell.
4：Experimental Procedures and Operational Workflow:
The absorption spectra of CsPbBr3 QDs were obtained using a CCD spectrometer. TEM images were used to determine the average size of the QDs. Elemental composition was determined using ICP-MS. Transient absorption measurements were performed with a pump-probe setup.
5：Data Analysis Methods:
The absorption cross section was calculated from the molar absorption coefficient using Beer's law. The TA signal saturation was analyzed to determine the absorption cross section.
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Transmission Electron Microscope
FEI Tecnai G2 F20 ST
FEI
Obtaining TEM images of CsPbBr3 QDs
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ICP-MS Instrument
NexION 300
Determining elemental composition of Cs and Pb
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Titanium-Sapphire Amplifier
KM Laboratories
Generating 800 nm output for pump beam
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β-Barium Borate Crystal
Doubling the 800 nm output to generate 400 nm pump
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White Light Supercontinuum Probe
Generating probe beam for transient absorption measurements
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Amplified Si Photodiodes
Recording transient absorption data
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Monochromator
Oriel Cornerstone 130
Newport
Selecting probe wavelength for transient absorption measurements
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Quartz Flow Cell
Holding QD samples for transient absorption measurements
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