Additive-Free Transparent Triarylamine-Based Polymeric Hole-Transport Materials for Stable Perovskite Solar Cells

• Published in: ChemSusChem 2016-09, Vol.9 (18), p.2567-2571
• Main Authors: Matsui, Taisuke, Petrikyte, Ieva, Malinauskas, Tadas, Domanski, Konrad, Daskeviciene, Maryte, Steponaitis, Matas, Gratia, Paul, Tress, Wolfgang, Correa-Baena, Juan-Pablo, Abate, Antonio, Hagfeldt, Anders, Grätzel, Michael, Nazeeruddin, Mohammad Khaja, Getautis, Vytautas, Saliba, Michael
• Format: Article
• Language: English
• Subjects: additive free; Additives; Amines - chemistry; Calcium Compounds - chemistry; Devices; Drug Stability; Electric Power Supplies; Energy conversion efficiency; Functional groups; hole-transport material; Oxides - chemistry; perovskite solar cells; Perovskites; Photovoltaic cells; polymer; Polymers - chemistry; Solar cells; Solar Energy; stability; Temperature; Titanium - chemistry; Tracking
• ISSN: 1864-5631; 1864-564X
• DOI: 10.1002/cssc.201600762

Triarylamine‐based polymers with different functional groups were synthetized as hole‐transport materials (HTMs) for perovskite solar cells (PSCs). The novel materials enabled efficient PSCs without the use of chemical doping (or additives) to enhance charge transport. Devices employing poly(triarylamine) with methylphenylethenyl functional groups (V873) showed a power conversion efficiency of 12.3 %, whereas widely used additive‐free poly[bis(4‐phenyl)(2,4,6‐trimethylphenyl)amine] (PTAA) demonstrated 10.8 %. Notably, devices with V873 enabled stable PSCs under 1 sun illumination at maximum power point tracking for approximately 40 h at room temperature, and in the dark under elevated temperature (85 °C) for more than 140 h. This is in stark contrast to additive‐containing devices, which degrade significantly within the same time frame. The results present remarkable progress towards stable PSC under real working conditions and industrial stress tests. PolyTPAs for stable PSCs: Poly(triarylamine) with methylphenylethenyl functional groups (V873) is used as a hole‐transporting material in perovskite solar cells (PSCs). Devices employing V873 reach a power conversion efficiency of 12.3 % without any additives, and enable stable operation under 1 sun at maximum power point tracking and under elevated temperature (85 °C). This result shows remarkable progress towards stable PSCs under real working conditions and industrial stress tests.