Aly Elakshar

Photovoltaics play a crucial role in the global transition toward sustainable energy sources. As the demand for more efficient and cost‐effective solar technologies grows, innovative materials and designs are explored by researchers to enhance solar cell performance. Herein, the potential of single‐walled carbon nanotube (SWCNT) thin films as transparent electrodes in wide‐bandgap mixed halide perovskite solar cells is assessed. SWCNTs synthesized by the aerosol chemical deposition method are employed as the back electrode. The transparency of the perovskite cells makes them promising candidates for tandem top cells in a multi‐junction solar device. In these experiments, it is demonstrated that perovskite cells with SWCNT electrodes achieve a power conversion efficiency (PCE) of 12.63% in the reverse scan. When combined with a silicon bottom cell (PCE of 22.50%) in a tandem configuration, the overall efficiency reaches 24.37% despite a decrease in the bottom cell's performance due to shadowing effects. In these results, the potential of SWCNT electrodes in developing high‐efficiency tandem solar cells is highlighted. In this research, by combining the advantages of perovskite technology with the unique properties of SWCNTs, new avenues for advancing photovoltaic performance and contributing to the broader goal of sustainable energy production are opened.

Here, we present a synthesis of three novel conjugated block-copolymers (BCP) with general formula P3HT-bridge-TBO, where P3HT is a poly(3-hexyl)thiophene, TBO is a thiophene-benzothiadiazole block, and the bridge is composed of two fluorene units (FF) or two thiophenes (TT) or a mixture (TF). It is demonstrated that the physicochemical properties of the materials with different bridges are similar. Furthermore, P3HT-bridge-TBO materials are investigated in PSCs with classical n-i-p configuration for the first time. PSCs with BCPs reach average efficiencies with a top of 14.4% for P3HT-FF-TBO. At the same time, devices demonstrate spectacular long-term operation stability after 1000 h under constant illumination with minor changes in efficiency, while PSCs with state-of-the-art hole-transport layer demonstrate unstable behavior. This groundbreaking work demonstrates the potential of BCP to ensure the stable operation of perovskite photovoltaics.