Efficient and stable PbS quantum dot solar cells by triple-cation perovskite passivation
Solution-processed quantum dots (QDs) have a high potential for fabricating low-cost, flexible, and large-scale solar energy harvesting devices. It has recently been demonstrated that hybrid devices employing a single monovalent cation perovskite solution for PbS QD surface passivation exhibit enhan...
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| Main Authors: | , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
2020
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| In: |
ACS nano
Year: 2019, Volume: 14, Issue: 1, Pages: 384-393 |
| ISSN: | 1936-086X |
| DOI: | 10.1021/acsnano.9b05848 |
| Online Access: | Verlag, Volltext: https://doi.org/10.1021/acsnano.9b05848 Verlag: https://doi.org/10.1021/acsnano.9b05848 
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| Author Notes: | Miguel Albaladejo-Siguan, David Becker-Koch, Alexander D. Taylor, Qing Sun, Vincent Lami, Pola Goldberg Oppenheimer, Fabian Paulus, and Yana Vaynzof |
| Summary: | Solution-processed quantum dots (QDs) have a high potential for fabricating low-cost, flexible, and large-scale solar energy harvesting devices. It has recently been demonstrated that hybrid devices employing a single monovalent cation perovskite solution for PbS QD surface passivation exhibit enhanced photovoltaic performance when compared to standard ligand passivation. Herein, we demonstrate that the use of a triple cation Cs0.05(MA0.17FA0.83)0.95Pb(I0.9Br0.1)3 perovskite composition for surface passivation of the quantum dots results in highly efficient solar cells, which maintain 96% of their initial performance after 1200 h shelf storage. We confirm perovskite shell formation around the PbS nanocrystals by a range of spectroscopic techniques as well as high-resolution transmission electron microscopy. We find that the triple cation shell results in a favorable energetic alignment to the core of the dot, resulting in reduced recombination due to charge confinement without limiting transport in the active layer. Consequently, photovoltaic devices fabricated via a single-step film deposition reached a maximum AM1.5G power conversion efficiency of 11.3% surpassing most previous reports of PbS solar cells employing perovskite passivation. |
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| Item Description: | Publication Date: November 13, 2019 Gesehen am 27.02.2020 |
| Physical Description: | Online Resource |
| ISSN: | 1936-086X |
| DOI: | 10.1021/acsnano.9b05848 |