Sequential Co-Passivation in InAs Colloidal Quantum Dot Solids Enables Efficient Near-Infrared Photodetectors

Bibliographische Detailangaben
Veröffentlicht in:	Advanced materials (Deerfield Beach, Fla.). - 1998. - 35(2023), 28 vom: 01. Juli, Seite e2301842
1. Verfasser:	Xia, Pan (VerfasserIn)
Weitere Verfasser:	Sun, Bin, Biondi, Margherita, Xu, Jian, Atan, Ozan, Imran, Muhammad, Hassan, Yasser, Liu, Yanjiang, Pina, Joao M, Najarian, Amin Morteza, Grater, Luke, Bertens, Koen, Sagar, Laxmi Kishore, Anwar, Husna, Choi, Min-Jae, Zhang, Yangning, Hasham, Minhal, García de Arquer, F Pelayo, Hoogland, Sjoerd, Wilson, Mark W B, Sargent, Edward H
Format:	Online-Aufsatz
Sprache:	English
Veröffentlicht:	2023
Zugriff auf das übergeordnete Werk:	Advanced materials (Deerfield Beach, Fla.)
Schlagworte:	Journal Article III-V compound semiconductors indium arsenide near-infrared photodetectors J1A23S0911 Ligands methyl acetate W684QT396F

Beschreibung
Zusammenfassung:	© 2023 The Authors. Advanced Materials published by Wiley-VCH GmbH. III-V colloidal quantum dots (CQDs) are promising materials for optoelectronic applications, for they avoid heavy metals while achieving absorption spanning the visible to the infrared (IR). However, the covalent nature of III-V CQDs requires the development of new passivation strategies to fabricate conductive CQD solids for optoelectronics: this work shows herein that ligand exchanges, previously developed in II-VI and IV-VI quantum dots and employing a single ligand, do not fully passivate CQDs, and that this curtails device efficiency. Guided by density functional theory (DFT) simulations, this work develops a co-passivation strategy to fabricate indium arsenide CQD photodetectors, an approach that employs the combination of X-type methyl ammonium acetate (MaAc) and Z-type ligands InBr3 . This approach maintains charge carrier mobility and improves passivation, seen in a 25% decrease in Stokes shift, a fourfold reduction in the rate of first-exciton absorption linewidth broadening over time-under-stress, and leads to a doubling in photoluminescence (PL) lifetime. The resulting devices show 37% external quantum efficiency (EQE) at 950 nm, the highest value reported for InAs CQD photodetectors
Beschreibung:	Date Completed 17.07.2023 Date Revised 18.07.2023 published: Print-Electronic Citation Status PubMed-not-MEDLINE
ISSN:	1521-4095
DOI:	10.1002/adma.202301842