Rapid In Situ Ligand‐Exchange Process Used to Prepare 3D PbSe Nanocrystal Superlattice Infrared Photodetectors
Abstract
Abstract Colloidal semiconductor nanocrystals are important building blocks for low‐cost, solution‐processed electronic devices with tunable functionalities. Considerable progress is made in improving charge transport through nanocrystal films by exchanging long insulating ligands with shorter passivating ligands. To take full advantage of this strategy, it is equally important to fabricate close‐packed structures that reduce the average interparticle spacing. Yet it remains a challenge to retain long‐range, close‐packed order after ligand exchange. Here, a novel one‐step in situ ligand‐exchange method is demonstrated that enables rapid (5 min) ligand exchange of nanocrystal films, which are more than 50 layers thick. Using this simple and efficient method, it is shown that the face‐centered cubic ordering of 500 nm thick PbSe nanocrystal films is retained after ligand exchange from oleic acid to benzoic acid. Moreover, it is demonstrated that PbSe nanocrystal photodetectors with a well‐ordered structure have superior optoelectronic properties compared to disordered films; ordered films have a 16× higher responsivity of ≈0.25 A W −1 at 1 V and a 2× faster response time. As far as it is known, this is the first report to realize a rapid one‐step ligand exchange through a thick superlattice film with retention of long‐range order.
- Authors:
-
[1];
[1];
[1]
- Lawrence Livermore National Laboratory 7000 East Avenue Livermore CA 94550 USA
- Voxtel Opto An Allegro Microsystems Company 1443 E. 13th Avenue Eugene OR 97403 USA
- Publication Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1784350
- Alternate Identifier(s):
- OSTI ID: 1784355; OSTI ID: 1787205
- Report Number(s):
- LLNL-JRNL-818923
Journal ID: ISSN 1613-6810; 2101166
- Grant/Contract Number:
- AC52-07NA27344
- Resource Type:
- Published Article
- Journal Name:
- Small
- Additional Journal Information:
- Journal Name: Small Journal Volume: 17 Journal Issue: 25; Journal ID: ISSN 1613-6810
- Publisher:
- Wiley Blackwell (John Wiley & Sons)
- Country of Publication:
- Germany
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; nanoparticles; superlattice; nanomaterials; assembly; ligand-exchange; lead selenide; infrared detecton
Citation Formats
Xu, Xiaojie, Kweon, Kyoung E., Keuleyan, Sean, Sawvel, April, Cho, En Ju, and Orme, Christine. Rapid In Situ Ligand‐Exchange Process Used to Prepare 3D PbSe Nanocrystal Superlattice Infrared Photodetectors. Germany: N. p., 2021.
Web. doi:10.1002/smll.202101166.
Xu, Xiaojie, Kweon, Kyoung E., Keuleyan, Sean, Sawvel, April, Cho, En Ju, & Orme, Christine. Rapid In Situ Ligand‐Exchange Process Used to Prepare 3D PbSe Nanocrystal Superlattice Infrared Photodetectors. Germany. https://doi.org/10.1002/smll.202101166
Xu, Xiaojie, Kweon, Kyoung E., Keuleyan, Sean, Sawvel, April, Cho, En Ju, and Orme, Christine. Fri .
"Rapid In Situ Ligand‐Exchange Process Used to Prepare 3D PbSe Nanocrystal Superlattice Infrared Photodetectors". Germany. https://doi.org/10.1002/smll.202101166.
@article{osti_1784350,
title = {Rapid In Situ Ligand‐Exchange Process Used to Prepare 3D PbSe Nanocrystal Superlattice Infrared Photodetectors},
author = {Xu, Xiaojie and Kweon, Kyoung E. and Keuleyan, Sean and Sawvel, April and Cho, En Ju and Orme, Christine},
abstractNote = {Abstract Colloidal semiconductor nanocrystals are important building blocks for low‐cost, solution‐processed electronic devices with tunable functionalities. Considerable progress is made in improving charge transport through nanocrystal films by exchanging long insulating ligands with shorter passivating ligands. To take full advantage of this strategy, it is equally important to fabricate close‐packed structures that reduce the average interparticle spacing. Yet it remains a challenge to retain long‐range, close‐packed order after ligand exchange. Here, a novel one‐step in situ ligand‐exchange method is demonstrated that enables rapid (5 min) ligand exchange of nanocrystal films, which are more than 50 layers thick. Using this simple and efficient method, it is shown that the face‐centered cubic ordering of 500 nm thick PbSe nanocrystal films is retained after ligand exchange from oleic acid to benzoic acid. Moreover, it is demonstrated that PbSe nanocrystal photodetectors with a well‐ordered structure have superior optoelectronic properties compared to disordered films; ordered films have a 16× higher responsivity of ≈0.25 A W −1 at 1 V and a 2× faster response time. As far as it is known, this is the first report to realize a rapid one‐step ligand exchange through a thick superlattice film with retention of long‐range order.},
doi = {10.1002/smll.202101166},
journal = {Small},
number = 25,
volume = 17,
place = {Germany},
year = {Fri May 21 00:00:00 EDT 2021},
month = {Fri May 21 00:00:00 EDT 2021}
}
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