Interdot Lead Halide Excess Management in PbS Quantum Dot Solar Cells

Research output: Contribution to journalResearch articleContributedpeer-review


Light-harvesting devices made from lead sulfide quantum dot (QD) absorbers are one of the many promising technologies of third-generation photovoltaics. Their simple, solution-based fabrication, together with a highly tunable and broad light absorption makes their application in newly developed solar cells, particularly promising. In order to yield devices with reduced voltage and current losses, PbS QDs need to have strategically passivated surfaces, most commonly achieved through lead iodide and bromide passivation. The interdot spacing is then predominantly filled with residual amorphous lead halide species that remain from the ligand exchange, thus hindering efficient charge transport and reducing device stability. Herein, it is demonstrated that a post-treatment by iodide-based 2-phenylethlyammonium salts and intermediate 2D perovskite formation can be used to manage the lead halide excess in the PbS QD active layer. This treatment results in improved device performance and increased shelf-life stability, demonstrating the importance of interdot spacing management in PbS QD photovoltaics.


Original languageEnglish
Article number2202994
JournalAdvanced energy materials
Issue number45
Early online date3 Oct 2022
Publication statusPublished - 1 Dec 2022

External IDs

Scopus 85139207316
unpaywall 10.1002/aenm.202202994
Mendeley 9176bbb2-73ec-30c8-94a6-e43d293da33b
ORCID /0000-0002-4112-6991/work/142254753


Sustainable Development Goals


  • 2D perovskites, passivation, quantum dots, solar cells, Solar cells, Quantum dots, Passivation

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