Steric Effect-Controlled Atomic Passivation of Colloidal InAs Quantum Dots for Infrared Photodetectors.

Authors

In-Suh Lee, Gaeun Cho, Yongnam Ahn, Minjung Yang, Seoryeon Jeong, Seungin Jee, Yujin Jung, Han Seul Kim, Se-Woong Baek

Published in

Small (Weinheim an der Bergstrasse, Germany). Pages e74263. Jun 23, 2026. Epub Jun 23, 2026.

Abstract

Infrared colloidal quantum dots (CQDs) are emerging as promising materials for next-generation optoelectronics. Among these, III-V group CQDs have gained attention as lead-free alternatives. However, achieving efficient surface passivation remains a key challenge for high-performance lead-free CQD infrared optoelectronics. Herein, we present a sequential ligand adsorption model using density functional theory, integrated with systematic experiments, to thoroughly explore atomic ligand passivation, suited for indium arsenide (InAs) CQDs. We find that overall ligand adsorption dynamics-and thus the degree of surface passivation-are governed by ion-size-dependent steric hindrance and the electrostatic interactions of halide ligands. Smaller halide ligands enable more effective surface passivation and more balanced stoichiometry, leading to improved charge transport. As a result, an optimized InAs CQD photodiode exhibits a specific detectivity of 3.2 × 10¹² Jones at 980 nm.

PMID:
42335337
Bibliographic data and abstract were imported from PubMed on 24 Jun 2026.

Read full publication at:
Please sign in to see all details.

Stats

1-terrible, 9-excellent. How would you rate this publication? Sign in in to submit your rating.

Post a comment

You need to be signed in to post comments. You can sign in here.

Comments

There are no comments yet.