BF Spencer
Charge dynamics at heterojunctions for PbS/ZnO colloidal quantum dot solar cells probed with time-resolved surface photovoltage spectroscopy
Spencer, BF; Leontiadou, M; Clark, PCJ; Williamson, AI; Silly, MG; Sirotti, F; Fairclough, SM; Tsang, SCE; Neo, DCJ; Assender, HE; Watt, AAR; Flavell, WR
Authors
Dr Marina Leontiadou M.Leontiadou@salford.ac.uk
Associate Professor/Reader
PCJ Clark
AI Williamson
MG Silly
F Sirotti
SM Fairclough
SCE Tsang
DCJ Neo
HE Assender
AAR Watt
WR Flavell
Abstract
Time-resolved laser-pump X-ray-photoemission-probe spectroscopy of a ZnO (101 ⎯ ⎯ 0
101¯0
) substrate with and without PbS quantum dots (QDs) chemically linked to the surface is performed, using laser photon energies resonant with and below the band gap energy of the substrate (λ = 372 and 640 nm, hν = 3.33 and 1.94 eV). Charge injection from the photoexcited QDs to ZnO is demonstrated through the change in the surface photovoltage of the ZnO substrate observed when the heterojunction is illuminated with 1.94 eV radiation. The measured carrier dynamics are limited by the persistent photoconductivity of ZnO, giving dark carrier lifetimes of the order of 200 μs in a depletion layer at the interface. The chemical specificity of soft X-rays is used to separately measure the charge dynamics in the quantum dots and the substrate, yielding evidence that the depletion region at the interface extends into the PbS QD layer.
Citation
Spencer, B., Leontiadou, M., Clark, P., Williamson, A., Silly, M., Sirotti, F., …Flavell, W. (2016). Charge dynamics at heterojunctions for PbS/ZnO colloidal quantum dot solar cells probed with time-resolved surface photovoltage spectroscopy. Applied Physics Letters, 108(9), 091603. https://doi.org/10.1063/1.4943077
Journal Article Type | Article |
---|---|
Acceptance Date | Feb 18, 2016 |
Online Publication Date | Mar 1, 2016 |
Publication Date | Mar 1, 2016 |
Deposit Date | Apr 1, 2019 |
Publicly Available Date | Apr 1, 2019 |
Journal | Applied Physics Letters |
Print ISSN | 0003-6951 |
Publisher | AIP Publishing |
Volume | 108 |
Issue | 9 |
Pages | 091603 |
DOI | https://doi.org/10.1063/1.4943077 |
Publisher URL | https://doi.org/10.1063/1.4943077 |
Related Public URLs | https://aip.scitation.org/journal/apl |
Files
1.4943077.pdf
(1.8 Mb)
PDF
Licence
http://creativecommons.org/licenses/by/3.0/
Publisher Licence URL
http://creativecommons.org/licenses/by/3.0/
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