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HL: Fachverband Halbleiterphysik

HL 25: Perovskite and photovoltaics I (joint session HL/CPP)

HL 25.7: 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.