Inorganic-ligand exchanging time effect in PbS quantum dot solar cell
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Publication Date
2016-08-08Journal Title
Applied Physics Letters
ISSN
0003-6951
Publisher
AIP Publishing
Volume
109
Issue
6
Type
Article
This Version
VoR
Metadata
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Kim, B., Hong, J., Hou, B., Cho, Y., Sohn, J., Cha, S., & Kim, J. (2016). Inorganic-ligand exchanging time effect in PbS quantum dot solar cell. Applied Physics Letters, 109 (6) https://doi.org/10.1063/1.4960645
Abstract
We investigate time-dependent inorganic ligand exchanging effect and photovoltaic performance of lead sulfide (PbS) nanocrystal films. With optimal processing time, volume shrinkage induced by residual oleic acid of the PbS colloidal quantum dot (CQD) was minimized and a crack-free film was obtained with improved flatness. Furthermore, sufficient surface passivation significantly increased the packing density by replacing from long oleic acid to a short iodide molecule. It thus facilities exciton dissociation via enhanced charge carrier transport in PbS CQD films, resulting in the improved power conversion efficiency from 3.39% to 6.62%. We also found that excess iodine ions on the PbS surface rather hinder high photovoltaic performance of the CQD solar cell.
Sponsorship
European Research Council (340538)
Identifiers
External DOI: https://doi.org/10.1063/1.4960645
This record's URL: https://www.repository.cam.ac.uk/handle/1810/286877
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