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Facet-Oriented Coupling Enables Fast and Sensitive Colloidal Quantum Dot Photodetectors

Title
Facet-Oriented Coupling Enables Fast and Sensitive Colloidal Quantum Dot Photodetectors
Authors
Biondi, MargheritaChoi, Min-JaeWang, ZhiboWei, MingyangLee, SeungjinChoubisa, HitarthSagar, Laxmi KishoreSun, BinBaek, Se-WoongChen, BinTodorovic, PetarNajarian, Amin MortezaRasouli, Armin SedighianNam, Dae-HyunVafaie, MaralLi, Yuguang C.Bertens, KoenHoogland, SjoerdVoznyy, Oleksandrde Arquer, F. Pelayo GarciaSargent, Edward H.
DGIST Authors
Biondi, Margherita; Choi, Min-Jae; Wang, Zhibo; Wei, Mingyang; Lee, Seungjin; Choubisa, Hitarth; Sagar, Laxmi Kishore; Sun, Bin; Baek, Se-Woong; Chen, Bin; Todorovic, Petar; Najarian, Amin Morteza; Rasouli, Armin Sedighian; Nam, Dae-Hyun; Vafaie, Maral; Li, Yuguang C.; Bertens, Koen; Hoogland, Sjoerd; Voznyy, Oleksandr; de Arquer, F. Pelayo Garcia; Sargent, Edward H.
Issue Date
2021-07
Citation
Advanced Materials, 33(33)
Type
Article
Author Keywords
colloidal atomic layer depositioncolloidal quantum dotscouplingfacetsphotodetectors
Keywords
ELECTRONIC-STRUCTUREPBS NANOCRYSTALSCHARGE-TRANSPORTSOLAR-CELLSSHAPESURFACEINKSPSEUDOPOTENTIALSMOBILITY
ISSN
0935-9648
Abstract
Charge carrier transport in colloidal quantum dot (CQD) solids is strongly influenced by coupling among CQDs. The shape of as-synthesized CQDs results in random orientational relationships among facets in CQD solids, and this limits the CQD coupling strength and the resultant performance of optoelectronic devices. Here, colloidal-phase reconstruction of CQD surfaces, which improves facet alignment in CQD solids, is reported. This strategy enables control over CQD faceting and allows demonstration of enhanced coupling in CQD solids. The approach utilizes post-synthetic resurfacing and unites surface passivation and colloidal stability with a propensity for dots to couple via (100):(100) facets, enabling increased hole mobility. Experimentally, the CQD solids exhibit a 10x increase in measured hole mobility compared to control CQD solids, and enable photodiodes (PDs) exhibiting 70% external quantum efficiency (vs 45% for control devices) and specific detectivity, D* > 10(12) Jones, each at 1550 nm. The photodetectors feature a 7 ns response time for a 0.01 mm(2) area-the fastest reported for solution-processed short-wavelength infrared PDs.
URI
http://hdl.handle.net/20.500.11750/15473
DOI
10.1002/adma.202101056
Publisher
WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Related Researcher
  • Author Nam, Dae-Hyun Renewable Energy Conversion Materials Laboratory
  • Research Interests Carbon dioxide reduction; Water splitting; Energy conversion; Electrochemistry; Materials Science
Files:
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Collection:
Department of Energy Science and EngineeringRenewable Energy Conversion Materials Laboratory1. Journal Articles


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