All-inorganic Germanium nanocrystal films by cationic ligand exchange

Wheeler, Lance M.; Nichols, Asa W.; Chernomordik, Boris D.; Anderson, Nicholas C.; Beard, Matthew C.; Neale, Nathan R.

doi:10.1021/acs.nanolett.5b05192

Title: All-inorganic Germanium nanocrystal films by cationic ligand exchange

Journal Article · Thu Jan 21 00:00:00 EST 2016 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.5b05192· OSTI ID:1242684

Wheeler, Lance M. ^[1]; Nichols, Asa W. ^[2]; Chernomordik, Boris D. ^[1]; Anderson, Nicholas C. ^[1]; Beard, Matthew C. ^[1]; Neale, Nathan R. ^[1]

National Renewable Energy Lab. (NREL), Golden, CO (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States); West Virginia Wesleyan College, Buckhannon, WV (United States)

In this study, we introduce a new paradigm for group IV nanocrystal surface chemistry based on room temperature surface activation that enables ionic ligand exchange. Germanium nanocrystals synthesized in a gas-phase plasma reactor are functionalized with labile, cationic alkylammonium ligands rather than with traditional covalently bound groups. We employ Fourier transform infrared and 1H nuclear magnetic resonance spectroscopies to demonstrate the alkylammonium ligands are freely exchanged on the germanium nanocrystal surface with a variety of cationic ligands, including short inorganic ligands such as ammonium and alkali metal cations. This ionic ligand exchange chemistry is used to demonstrate enhanced transport in germanium nanocrystal films following ligand exchange as well as the first photovoltaic device based on an all-inorganic germanium nanocrystal absorber layer cast from solution. This new ligand chemistry should accelerate progress in utilizing germanium and other group IV nanocrystals for optoelectronic applications.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Advanced Solar Photophysics (CASP)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC36-08GO28308; AC52-06NA25396

OSTI ID:: 1242684

Report Number(s):: NREL/JA-5900-65566

Journal Information:: Nano Letters, Vol. 16, Issue 3; Related Information: Nano Letters; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 30 works

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Title: All-inorganic Germanium nanocrystal films by cationic ligand exchange

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