Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 2: Hybrid and Perovskite Photovoltaics I

CPP 2.5: Vortrag

Montag, 1. April 2019, 10:45–11:00, H18

Universal self-assembled monolayers as hole contacts for high-performance p-i-n Perovskite solar cells — •Amran Al-Ashouri¹, Artiom Magomedov², Marcel Roß¹, José M. Prieto¹, Eike Köhnen¹, Marko Jošt¹, Tadas Malinauskas², Thomas Unold¹, Vytautas Getautis², and Steve Albrecht¹ — ¹HZB, Berlin, Germany — ²KTU, Kaunas, Lithuania

We recently presented a novel concept for hole-selective contacts in perovskite solar cells (PSCs) by utilizing a molecule that forms a self-assembled monolayer (SAM) on the transparent conductive oxide via covalent bonds [1]. Here we present results from a new class of hole-selective SAMs that enable p-i-n PSCs with open-circuit voltages (Voc’s) of up to 1.19 V, fill factors of over 80 % and thus power conversion efficiencies of up to 21 % for three different perovskite compositions. Hyperspectral, absolute and transient photoluminescence spectroscopy reveal that the reduction of non-radiative recombination losses at the hole contact interface, accompanied by high charge carrier lifetimes, is partially the origin of the relatively high Voc. Interestingly, implementing the SAMs also reduces non-radiative recombination at the electron-selective contact (C60). We further analyze the SAMs by IR and X-ray spectroscopy to assess the surface modification and energetic alignments. Our work demonstrates cell performances that rival best published p-i-n PSCs, without any interlayers, doping or perovskite post-treatments and might therefore serve as a suitable strategy for further performance improvements.
[1] Magomedov et al. Adv. Energy Mater. 2018, 8, 1801892