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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 45: Perovskite and photovoltaics I (joint session HL/CPP)
CPP 45.7: Vortrag
Dienstag, 17. März 2020, 11:30–11:45, POT 251
Efficient and Stable Hybrid Triple-Cation Perovskite/PbS Quantum Dot Solar Cells — •Miguel Albaladejo-Siguan1, David Becker-Koch1, Alex Taylor1, Qing Sun2, Vincent Lami2, Pola Goldberg-Oppenheimer3, Fabian Paulus1, and Yana Vaynzof1 — 1Integrated Centre for Applied Physics and Photonic Materials and cfaed, Technical University Dresden — 2Kirchhoff Institute for Physics, Heidelberg University — 3School of Biochemical Engineering, University of Birmingham, United Kingdom
Solution-processed quantum dots (QDs) are promising for fabricating flexible, low cost and large-scale solar cells. Researchers have shown that QD devices employing a single monovalent cation perovskite shell exhibit an increased PCE when compared to standard ligand passivation. Herein we demonstrate that the use of a triple cation Cs_0.05(MA_0.17FA_0.83)_0.95Pb(I_0.9Br_0.1)_3 perovskite composition for surface passivation of the QDs results in highly efficient solar cells, which maintain 96 % of their initial performance after 1200h shelf storage. We trace the perovskite shell formation around the core by a range of spectroscopic techniques as well as high-resolution TEM. 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 reached a maximum AM1.5G power conversion efficiency of 11.3 % surpassing previous reports of PbS solar cells employing perovskite passivation.