Sökning: onr:"swepub:oai:DiVA.org:uu-449265" >
Two-Dimensional Gal...
Two-Dimensional Gallium Sulfide Nanoflakes for UV-Selective Photoelectrochemical-type Photodetectors
-
- Zappia, Marilena, I (författare)
- BeDimens Spa, I-16163 Genoa, Italy.;Univ Calabria, Dept Phys, I-87036 Arcavacata Di Rende, CS, Italy.
-
- Bianca, Gabriele (författare)
- Ist Italiano Tecnol, Graphene Labs, I-16163 Genoa, Italy.;Univ Genoa, Dipartimento Chim & Chim Ind, I-16146 Genoa, Italy.
-
- Bellani, Sebastiano (författare)
- BeDimens Spa, I-16163 Genoa, Italy.;Ist Italiano Tecnol, Graphene Labs, I-16163 Genoa, Italy.
-
visa fler...
-
- Curreli, Nicola (författare)
- Ist Italiano Tecnol IIT, Funct Nanosyst, I-16163 Genoa, Italy.
-
- Sofer, Zdenek (författare)
- Univ Chem & Technol Prague, Dept Inorgan Chem, Prague 16628 6, Czech Republic.
-
- Serri, Michele (författare)
- Ist Italiano Tecnol, Graphene Labs, I-16163 Genoa, Italy.
-
- Najafi, Leyla (författare)
- BeDimens Spa, I-16163 Genoa, Italy.;Ist Italiano Tecnol, Graphene Labs, I-16163 Genoa, Italy.
-
- Piccinni, Marco (författare)
- Univ Genoa, Dipartimento Chim & Chim Ind, I-16146 Genoa, Italy.
-
- Oropesa Nunez, Reinier (författare)
- Uppsala universitet,Fasta tillståndets fysik,BeDimens Spa, I-16163 Genoa, Italy.
-
- Marvan, Petr (författare)
- Univ Chem & Technol Prague, Dept Inorgan Chem, Prague 16628 6, Czech Republic.
-
- Pellegrini, Vittorio (författare)
- BeDimens Spa, I-16163 Genoa, Italy.
-
- Kriegel, Ilka (författare)
- Ist Italiano Tecnol IIT, Funct Nanosyst, I-16163 Genoa, Italy.
-
- Prato, Mirko (författare)
- Ist Italiano Tecnol, Mat Characterizat Facil, I-16163 Genoa, Italy.
-
- Cupolillo, Anna (författare)
- Univ Calabria, Dept Phys, I-87036 Arcavacata Di Rende, CS, Italy.
-
- Bonaccorso, Francesco (författare)
- BeDimens Spa, I-16163 Genoa, Italy.;Ist Italiano Tecnol, Graphene Labs, I-16163 Genoa, Italy.
-
visa färre...
-
BeDimens Spa, I-16163 Genoa, Italy;Univ Calabria, Dept Phys, I-87036 Arcavacata Di Rende, CS, Italy. Ist Italiano Tecnol, Graphene Labs, I-16163 Genoa, Italy.;Univ Genoa, Dipartimento Chim & Chim Ind, I-16146 Genoa, Italy. (creator_code:org_t)
- 2021-05-26
- 2021
- Engelska.
-
Ingår i: The Journal of Physical Chemistry C. - : American Chemical Society (ACS). - 1932-7447 .- 1932-7455. ; 125:22, s. 11857-11866
- Relaterad länk:
-
https://doi.org/10.1...
-
visa fler...
-
https://uu.diva-port... (primary) (Raw object)
-
https://pubs.acs.org...
-
https://urn.kb.se/re...
-
https://doi.org/10.1...
-
visa färre...
Abstract
Ämnesord
Stäng
- Two-dimensional (2D) transition-metal monochalcogenides have been recently predicted to be potential photo(electro)catalysts for water splitting and photoelectrochemical (PEC) reactions. Differently from the most established InSe, GaSe, GeSe, and many other monochalcogenides, bulk GaS has a large band gap of similar to 2.5 eV, which increases up to more than 3.0 eV with decreasing its thickness due to quantum confinement effects. Therefore, 2D GaS fills the void between 2D small-band-gap semiconductors and insulators, resulting of interest for the realization of van der Waals type-I heterojunctions in photocatalysis, as well as the development of UV light-emitting diodes, quantum wells, and other optoelectronic devices. Based on theoretical calculations of the electronic structure of GaS as a function of layer number reported in the literature, we experimentally demonstrate, for the first time, the PEC properties of liquid-phase exfoliated GaS nanoflakes. Our results indicate that solution-processed 2D GaS-based PEC-type photodetectors outperform the corresponding solid-state photodetectors. In fact, the 2D morphology of the GaS flakes intrinsically minimizes the distance between the photogenerated charges and the surface area at which the redox reactions occur, limiting electron-hole recombination losses. The latter are instead deleterious for standard solidstate configurations. Consequently, PEC-type 2D GaS photodetectors display a relevant UV-selective photoresponse. In particular, they attain responsivities of 1.8 mA W-1 in 1 M H2SO4 [at 0.8 V vs reversible hydrogen electrode (RHE)], 4.6 mA W-1 in 1 M Na2SO4 (at 0.9 V vs RHE), and 6.8 mA W--(1) in 1 M KOH (at 1.1. V vs RHE) under 275 nm illumination wavelength with an intensity of 1.3 mW cm(-2). Beyond the photodetector application, 2D GaS-based PEC-type devices may find application in tandem solar PEC cells in combination with other visible-sensitive low-band-gap materials, including transition-metal monochalcogenides recently established for PEC solar energy conversion applications.
Ämnesord
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
Hitta via bibliotek
Till lärosätets databas
- Av författaren/redakt...
-
Zappia, Marilena ...
-
Bianca, Gabriele
-
Bellani, Sebasti ...
-
Curreli, Nicola
-
Sofer, Zdenek
-
Serri, Michele
-
visa fler...
-
Najafi, Leyla
-
Piccinni, Marco
-
Oropesa Nunez, R ...
-
Marvan, Petr
-
Pellegrini, Vitt ...
-
Kriegel, Ilka
-
Prato, Mirko
-
Cupolillo, Anna
-
Bonaccorso, Fran ...
-
visa färre...
- Om ämnet
-
- NATURVETENSKAP
-
NATURVETENSKAP
-
och Kemi
-
och Fysikalisk kemi
- Artiklar i publikationen
-
The Journal of P ...
- Av lärosätet
-
Uppsala universitet