Semiconductor Nanocrystal Synthesis
Semiconductor Nanocrystal Synthesis - Related Videos
12:56
Seeded Synthesis of CdSe/CdS Rod and Tetrapod Nanocrystals
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Cited by 12 •
2013
A protocol for the seeded synthesis of rod-shaped and tetrapod-shaped multicomponent nanostructures consisting of CdS and CdSe is presented.
12:36
Semiconductors
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2023
Source: Derek Wilson, Asantha Cooray, PhD, Department of Physics & Astronomy, School of Physical Sciences, University of California, Irvine, CA Semiconductors are materials whose ability to conduct an electrical current depends strongly on their temperature and level of impurity. The most common type of semiconductor material is crystalline silicon. Most pure semiconductors are not outstanding conductors; to improve conductivity, a pure semiconductor is often combined or "doped" with an...
09:58
A Modular Microfluidic Technology for Systematic Studies of Colloidal Semiconductor Nanocrystals
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Cited by 4 •
2018
Detailed herein are the operation and assembly protocols of a modular microfluidic screening platform for the systematic characterization of colloidal semiconductor nanocrystal syntheses. Through fully adjustable system arrangements, highly efficient spectra collection may be carried out across 4 orders of magnitude reaction time scales within a mass transfer-controlled sampling space.
11:06
Fabrication of Fully Solution Processed Inorganic Nanocrystal Photovoltaic Devices
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Cited by 1 •
2016
This protocol describes the synthesis and solution deposition of inorganic nanocrystals layer by layer to produce thin film electronics on non-conductive surfaces. Solvent-stabilized inks can produce complete photovoltaic devices on glass substrates via spin and spray coating following post-deposition ligand exchange and sintering.
11:14
Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope
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Cited by 4 •
2016
The optical, electrical, and structural properties of dislocations and of grain boundaries in semiconductor materials can be determined by experiments performed in a scanning electron microscope. Electron microscopy has been used to investigate cathodoluminescence, electron beam induced current, and diffraction of backscattered electrons.
FAQs
During heating, molecular precursors decompose or react in the solvent, creating a brief period of rapid nucleation. Once nuclei form, crystal growth becomes the dominant process. Separating these stages matters because the balance between nucleation and subsequent growth influences particle size and uniformity, which ultimately affect the nanocrystals' electronic and optical behavior.
Surface ligands regulate how nanocrystals grow by interacting with their surfaces during the reaction. They are therefore not merely additives: their presence contributes to control of crystal development and surface chemistry. Managing ligand conditions helps tune the resulting particles for desired behavior, an important consideration when nanocrystals must later function in engineered optical or electronic devices.
Changing temperature, reaction time, precursor concentration, and surface-ligand conditions can shift particle size and uniformity. These variables act across the transition from precursor reaction to crystal growth, so controlling them helps produce more consistent nanocrystals. Their effects are especially important when an engineering application depends on predictable electronic or optical behavior.
A typical colloidal workflow begins by combining molecular precursors with a heated solvent, allowing the precursors to decompose or react. Rapid nucleation is followed by ligand-regulated crystal growth, while temperature, reaction time, precursor concentration, and ligand conditions are adjusted. This sequence provides a practical route for producing nanocrystals with controlled size and more uniform populations.
Controlling size, composition, and surface chemistry enables tunable absorption and photoluminescence. These optical responses provide useful outcomes for evaluating whether a synthesis has produced the intended nanocrystal characteristics. In engineering studies, this tunability connects material preparation with the performance requirements of optical components and devices.
Precise synthesis control matters because nanocrystal properties influence device performance, stability, and the feasibility of scalable manufacturing. Accordingly, semiconductor nanocrystals are relevant to light-emitting devices, displays, photovoltaics, sensors, and photocatalysis. The same control principles link nanoscale adjustments in size, composition, and surface chemistry to broader engineering objectives.