Hole-Selective Monolayers: Synthesis, Deposition, and Application in Efficient Perovskite Solar Cells.
Artiom Magomedov a, Amran Al-Ashouri b, Ernestas Kasparavicius a, Gediminas Niaura c, Tadas Malinauskas a, Steve Albrecht b, Vytautas Getautis a
a Department of Organic Chemistry, Kaunas University of Technology, Radvilenu 19, 50254, Kaunas, Lithuania
b Helmholtz-Zentrum Berlin für Materialien und Energie, Kekuléstraße 5, 12489 Berlin, Germany
c Center for Physical Sciences and Technology, Saulėtekio Av. 3, LT-10257 Vilnius, Lithuania
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2019 May 12th - 15th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Poster, Artiom Magomedov, 152
Publication date: 11th February 2019

Currently, the most popular method for the formation of the hole-selective layer in highly-efficient perovskite solar cells (PSCs) is a deposition from a solution by a spin-coating technique. However, this method introduces high material waste and is applicable only for flat substrates. In particular, this becomes an important issue for the dopant-free hole transporting materials, as it is practically not possible to deposit films <10 nm uniformly, without exposure of the substrate to the perovskite.

Recently, we have synthesized hole-selective phosphonic acid V1036 and used it for the modification of the ITO surface. Formation of the monolayer was proved by means of several techniques, including contact angle measurements, FTIR, SFG etc. Devices with such a layer demonstrated reasonably good performance of 17.8% [1]. In this work, we are further developing this concept by means of molecular engineering. Starting from the V1036, two new modifications (V1193 and V1194) were synthesized. PSCs in p-i-n configuration with these materials are routinely demonstrating over 20% power conversion efficiency, with the highest achieved result of 21.2%.

We believe that by further optimization of the molecular structure even better result can be achieved, without compromising price and stability. Further strategies for the molecular engineering will be discussed over the course of the presentation, trying to elucidate the most promising pathways.

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