Journal
STRUCTURAL DYNAMICS-US
Volume 8, Issue 2, Pages -Publisher
AIP Publishing
DOI: 10.1063/4.0000055
Keywords
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Funding
- H2020 European Research Council [ERC-2015-CoG-681881]
- MAX4ESSFUN of the European Regional Development Fund Interreg Oresund-Kattegat-Skagerrak [DTU-023]
- DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
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This study examines ultrafast, light-induced dynamics in copper-zinc-tin-sulfide (CZTS) photovoltaic nanoparticles through optical and x-ray transient absorption spectroscopy, revealing a rapid shift of electron density away from copper sites and the formation of a stable charge-separated and thermally excited structure. These findings, combined with density functional theory calculations, offer new insights into the structural and electronic dynamics of CZTS absorbers for solar cells.
Ultrafast, light-induced dynamics in copper-zinc-tin-sulfide (CZTS) photovoltaic nanoparticles are investigated through a combination of optical and x-ray transient absorption spectroscopy. Laser-pump, x-ray-probe spectroscopy on a colloidal CZTS nanoparticle ink yields element-specificity, which reveals a rapid photo-induced shift of electron density away from Cu-sites, affecting the molecular orbital occupation and structure of CZTS. We observe the formation of a stable charge-separated and thermally excited structure, which persists for nanoseconds and involves an increased charge density at the Zn sites. Combined with density functional theory calculations, the results provide new insight into the structural and electronic dynamics of CZTS absorbers for solar cells.
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