Combination of Metal Oxide and Polytriarylamine: A Design Principle to Improve the Stability of Perovskite Solar Cells

Marina M. Tepliakova, Alexandra N. Mikheeva, Pavel A. Somov, Eugene S. Statnik, Alexander M. Korsunsky and Keith J. Stevenson
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Marina M. Tepliakova: Center for Energy Science and Technology (CEST), Skolkovo Institute of Science and Technology, Nobel st. 3, 143026 Moscow, Russia
Alexandra N. Mikheeva: Center for Energy Science and Technology (CEST), Skolkovo Institute of Science and Technology, Nobel st. 3, 143026 Moscow, Russia
Pavel A. Somov: Center for Energy Science and Technology (CEST), Skolkovo Institute of Science and Technology, Nobel st. 3, 143026 Moscow, Russia
Eugene S. Statnik: Center for Energy Science and Technology (CEST), Skolkovo Institute of Science and Technology, Nobel st. 3, 143026 Moscow, Russia
Alexander M. Korsunsky: Center for Energy Science and Technology (CEST), Skolkovo Institute of Science and Technology, Nobel st. 3, 143026 Moscow, Russia
Keith J. Stevenson: Center for Energy Science and Technology (CEST), Skolkovo Institute of Science and Technology, Nobel st. 3, 143026 Moscow, Russia

Energies, 2021, vol. 14, issue 16, 1-13

Abstract: In the last decade, perovskite photovoltaics gained popularity as a potential rival for crystalline silicon solar cells, which provide comparable efficiency for lower fabrication costs. However, insufficient stability is still a bottleneck for technology commercialization. One of the key aspects for improving the stability of perovskite solar cells (PSCs) is encapsulating the photoactive material with the hole-transport layer (HTL) with low gas permeability. Recently, it was shown that the double HTL comprising organic and inorganic parts can perform the protective function. Herein, a systematic investigation and comparison of four double HTLs incorporating polytriarylamine and thermally evaporated transition metal oxides in the highest oxidation state are presented. In particular, it was shown that MoO x , WO x , and VO x -based double HTLs provided stable performance of PSCs for 1250 h, while devices with NbO x lost 30% of their initial efficiency after 1000 h. Additionally, the encapsulating properties of all four double HTLs were studied in trilayer stacks with HTL covering perovskite, and insignificant changes in the absorber composition were registered after 1000 h under illumination. Finally, it was demonstrated using ToF-SIMS that the double HTL prevented the migration of perovskite volatile components within the structure. Our findings pave the way towards improved PSC design that ensures their long-term operational stability.

Keywords: perovskite solar cells; hole-transport layer; stable photovoltaics; secondary ion spectroscopy (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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