Journal article
Element-specific investigations of ultrafast dynamics in photoexcited Cu2ZnSnS4 nanoparticles in solution
Department of Energy Conversion and Storage, Technical University of Denmark1
Lund University2
Atomic Scale Materials Modelling, Department of Energy Conversion and Storage, Technical University of Denmark3
Argonne National Laboratory4
Japan Synchrotron Radiation Research Institute5
Department of Physics, Technical University of Denmark6
Neutrons and X-rays for Materials Physics, Department of Physics, Technical University of Denmark7
The Graduate University for Advanced Studies8
Imaging and Structural Analysis, Department of Energy Conversion and Storage, Technical University of Denmark9
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.
| Language: | English |
|---|---|
| Publisher: | AIP Publishing LLC and ACA |
| Year: | 2021 |
| Pages: | 024501 |
| ISSN: | 23297778 |
| Types: | Journal article |
| DOI: | 10.1063/4.0000055 |
| ORCIDs: | Rein, Christian , Carrasco de Busturia, David , Gertsen, Anders Skovbo , Moltke, Asbjørn Meldgaard , García Lastra, Juan Maria , Nielsen, Martin Meedom , Haldrup, Kristoffer , Andreasen, Jens Wenzel , 0000-0002-0528-0422 , 0000-0002-2166-0636 and 0000-0002-2681-8316 |
