Neuartiges Additiv verbessert Leistung und Stabilität von invertierten Perowskit-Solarzellen

A team led by Prof. Ge Ziyi at the Ningbo Institute of Materials Technology and Engineering (NIMTE) of the Chinese Academy of Sciences has developed a novel multifunctional additive, potassium (4-tert-butoxycarbonylpiperazin-1-yl) methyl trifluoroborate (PTFBK), to enhance the efficiency and stability of inverted perovskite solar cells. Published in Angewandte Chemie International Edition, their research addresses the challenges of low power conversion efficiency (PCE) and poor long-term stability in PSCs, which have hindered their commercialization.

The additive PTFBK effectively passivates defects and promotes charge carrier transport in perovskite films, resulting in improved crystallization and larger grain size. The synergistic effect of PTFBK led to highly efficient rigid and flexible p-i-n PSCs with PCEs of 24.99% and 23.48%, respectively.

Moreover, the PTFBK-modified devices demonstrated exceptional thermal, humidity, and light stability under various conditions, including continuous heating at 85°C in N2-filled containers, ambient conditions at 60%–70% relative humidity, and continuous illumination at 100 mW cm-2. The flexible PSCs retained 85% of their initial PCE after 5,000 bending cycles at a radius of 5 mm, showcasing remarkable bending stability. This study opens up new avenues for the future development and commercialization of PSCs and related perovskite photovoltaic technologies.