Precursor Reactivity-Dependent Growth for Alloyed InGaP Quantum Dots

Area of Science:

• Materials Science
• Nanotechnology
• Semiconductor Physics

Background:

• Alloying is a key strategy for bandgap engineering in semiconductor quantum dots (QDs).
• Homogeneous alloyed QDs require precursors with matched reactivities for controlled synthesis.
• Indium gallium phosphide (InGaP) QDs are promising for optoelectronic applications but challenging to synthesize with controlled composition.

Purpose of the Study:

• To systematically screen indium and gallium precursors for synthesizing homogeneous alloyed InGaP QDs.
• To establish a correlation between precursor feed ratio and final QD composition.
• To achieve precise control over the gallium content in InGaP alloyed QDs.

Main Methods:

• Systematic screening of various indium and gallium precursors.
• Synthesis of alloyed InGaP quantum dots (QDs).
• Correlation analysis between precursor molar ratio and QD composition.
• Coating of InGaP QDs with a zinc sulfide (ZnS) shell.

Main Results:

• Identified indium and gallium precursors with matched reactivities for homogeneous InGaP QD synthesis.
• Achieved precise control over Ga content in InGaP QDs, ranging from 5% to 20%.
• Synthesized stable InGaP/ZnS core/shell QDs with a photoluminescence quantum yield of 70%.

Conclusions:

• Precursor reactivity matching is crucial for the synthesis of compositionally controlled alloyed QDs.
• This study provides a valuable reference for the rational design of advanced alloyed nanocrystals.
• Controlled synthesis of InGaP QDs opens avenues for advanced semiconductor materials.