{"database":"biostudies-literature","file_versions":[],"scores":null,"additional":{"submitter":["Hu L"],"funding":["Australian Research Council"],"pagination":["2003138"],"full_dataset_link":["https://www.ebi.ac.uk/biostudies/studies/S-EPMC7816699"],"repository":["biostudies-literature"],"omics_type":["Unknown"],"volume":["8(2)"],"pubmed_abstract":["The surface chemistry of colloidal quantum dots (CQD) play a crucial role in fabricating highly efficient and stable solar cells. However, as-synthesized PbS CQDs are significantly off-stoichiometric and contain inhomogeneously distributed S and Pb atoms at the surface, which results in undercharged Pb atoms, dangling bonds of S atoms and uncapped sites, thus causing surface trap states. Moreover, conventional ligand exchange processes cannot efficiently eliminate these undesired atom configurations and defect sites. Here, potassium triiodide (KI<sub>3</sub>) additives are combined with conventional PbX<sub>2</sub> matrix ligands to simultaneously eliminate the undercharged Pb species and dangling S sites via reacting with molecular I<sub>2</sub> generated from the reversible reaction KI<sub>3</sub> ⇌ I<sub>2</sub> + KI. Meanwhile, high surface coverage shells on PbS CQDs are built via PbX<sub>2</sub> and KI ligands. The implementation of KI<sub>3</sub> additives remarkably suppresses the surface trap states and enhances the device stability due to the surface chemistry optimization. The resultant solar cells achieve the best power convention efficiency of 12.1% and retain 94% of its initial efficiency under 20 h continuous operation in air, while the control devices with KI additive deliver an efficiency of 11.0% and retains 87% of their initial efficiency under the same conditions."],"journal":["Advanced science (Weinheim, Baden-Wurttemberg, Germany)"],"pubmed_title":["Optimizing Surface Chemistry of PbS Colloidal Quantum Dot for Highly Efficient and Stable Solar Cells via Chemical Binding."],"pmcid":["PMC7816699"],"funding_grant_id":["DP190103316"],"pubmed_authors":["Geng X","Kim J","Yuan J","Wan T","Liu X","Huang S","Guan X","Chu D","Younis A","Patterson R","Hu L","Wu T","Lin CH","Lei Q","Wu X"],"additional_accession":[]},"is_claimable":false,"name":"Optimizing Surface Chemistry of PbS Colloidal Quantum Dot for Highly Efficient and Stable Solar Cells via Chemical Binding.","description":"The surface chemistry of colloidal quantum dots (CQD) play a crucial role in fabricating highly efficient and stable solar cells. However, as-synthesized PbS CQDs are significantly off-stoichiometric and contain inhomogeneously distributed S and Pb atoms at the surface, which results in undercharged Pb atoms, dangling bonds of S atoms and uncapped sites, thus causing surface trap states. Moreover, conventional ligand exchange processes cannot efficiently eliminate these undesired atom configurations and defect sites. Here, potassium triiodide (KI<sub>3</sub>) additives are combined with conventional PbX<sub>2</sub> matrix ligands to simultaneously eliminate the undercharged Pb species and dangling S sites via reacting with molecular I<sub>2</sub> generated from the reversible reaction KI<sub>3</sub> ⇌ I<sub>2</sub> + KI. Meanwhile, high surface coverage shells on PbS CQDs are built via PbX<sub>2</sub> and KI ligands. The implementation of KI<sub>3</sub> additives remarkably suppresses the surface trap states and enhances the device stability due to the surface chemistry optimization. The resultant solar cells achieve the best power convention efficiency of 12.1% and retain 94% of its initial efficiency under 20 h continuous operation in air, while the control devices with KI additive deliver an efficiency of 11.0% and retains 87% of their initial efficiency under the same conditions.","dates":{"release":"2021-01-01T00:00:00Z","publication":"2021 Jan","modification":"2025-04-26T06:33:26.2Z","creation":"2025-04-06T11:55:12.775Z"},"accession":"S-EPMC7816699","cross_references":{"pubmed":["33511019"],"doi":["10.1002/advs.202003138"]}}