Incorporation of Vanadium(V) Oxide in Hybrid Hole Transport Layer Enables Long-term Operational Stability of Perovskite Solar Cells

Marina M Tepliakova; Aleksandra N Mikheeva; Lyubov A Frolova; Aleksandra G Boldyreva; Aly Elakshar; Artyom V Novikov; Sergey A Tsarev; Marina I Ustinova; Olga R Yamilova; Albert G Nasibulin; Sergey M Aldoshin; Keith J Stevenson; Pavel A Troshin

doi:10.1021/acs.jpclett.0c01600

Incorporation of Vanadium(V) Oxide in Hybrid Hole Transport Layer Enables Long-term Operational Stability of Perovskite Solar Cells

J Phys Chem Lett. 2020 Jul 16;11(14):5563-5568. doi: 10.1021/acs.jpclett.0c01600. Epub 2020 Jun 30.

Authors

Marina M Tepliakova^{1

2}, Aleksandra N Mikheeva^{1

3}, Lyubov A Frolova^{1

2}, Aleksandra G Boldyreva¹, Aly Elakshar¹, Artyom V Novikov^{1

2}, Sergey A Tsarev¹, Marina I Ustinova^{1

2}, Olga R Yamilova^{1

2}, Albert G Nasibulin^{1

4}, Sergey M Aldoshin², Keith J Stevenson¹, Pavel A Troshin^{1

2}

Affiliations

¹ Skolkovo Institute of Science and Technology, Nobel st. 3, 143026 Moscow, Russia.
² Institute for Problems of Chemical Physics, Russian Academy of Sciences, Semenov av. 1, 142432, Chernogolovka, Moscow region, Russia.
³ Mendeleev University of Chemical Technology of Russia, Miusskaya sq. 9, 125947 Moscow, Russia.
⁴ Aalto University, P.O. Box 16100, FI-00076 Espoo, Finland.

PMID: 32564599
DOI: 10.1021/acs.jpclett.0c01600

Abstract

Recent studies have shown that charge transport interlayers with low gas permeability can increase the operational lifetime of perovskite solar cells serving as a barrier for migration of volatile decomposition products from the photoactive layer. Herein we present a hybrid hole transport layer (HTL) comprised of p-type polytriarylamine (PTAA) polymer and vanadium(V) oxide (VO_x). Devices with PTAA/VO_x top HTL reach up to 20% efficiency and demonstrate negligible degradation after 4500 h of light soaking, whereas reference cells using PTAA/MoO_x as HTL lose ∼50% of their initial efficiency under the same aging conditions. It was shown that the main origin of the enhanced device stability lies in the higher tolerance of VO_x toward MAPbI₃ compared to the MoO_x interlayer, which tends to facilitate perovskite decomposition. Our results demonstrate that the application of PTAA/VO_x hybrid HTL enables long-term operational stability of perovskite solar cells, thus bringing them closer to commercial applications.