Investigation on Surface Chemistry of InP-based Quantum Dots during Shell Growth Reaction
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InP-based quantum dots (QDs) have become as one of promising candidates for electroluminescence materials in the field of displays and lightings owing to band gap tunability and high photoluminescence quantum yield (PL QY). In-depth study on surface chemistry of InP QDs has given a clue to explore synthetic protocol for high quality core/shell QDs with nearly unity QY. However, detailed reaction steps occurring on QDs’ surface during the shell growth is still unrevealed and different valency between III-V core and II-VI shell has been addressed as complication in the synthesis of core/shell QDs. Here, we investigate the modification of surface chemistry of InP-based QDs in the course of ZnSe shell growth. Multilateral probes like XPS, 1H-NMR, and ultrafast PL decay were introduced to track the change of surface ligands and chemical composition. We believe that our meticulous study helps broaden our understanding of semiconductor heteroepitaxy in wet chemistry.