Molecularly Engineered Multifunctional Bridging Layer Derived from Dithiafulavene Capped Spiroxanthene for Stable and Efficient Perovskite Solar Cells

• DOI: 10.1021/acsami.3c19619
• Publication Date: 2024-03-26T04:51:17Z
• Authors: Afzal Siddiqui; Faranak Sadegh; Kodali Phani Kumar; Priksha Rana; Pankaj Yadav; Daniel Prochowicz; Surya Prakash Singh; Seckin Akin
• Keywords: Composite material; Polymers and Plastics; Perovskite Solar Cell Technology; Materials Science; Organic chemistry; Phenothiazine; Conducting Polymer Research; Catalysis; Layer (electronics); Engineering; Chemical engineering; FOS: Electrical engineering, electronic engineering, information engineering; Nanotechnology; Electrical and Electronic Engineering; Optoelectronics; Polymer; Perovskite (structure); Bifunctional; Biology; Alkyl; Photovoltaic system; FOS: Chemical engineering; Pharmacology; FOS: Nanotechnology; Ecology; High-Efficiency Solar Cells; Organic Solar Cell Technology; Materials science; Fluorene; Chemistry; FOS: Biological sciences; Physical Sciences; Energy conversion efficiency; Medicine; Perovskite Solar Cells

This study introduces a novel approach centered around the design and synthesis of an interfacial passivating layer in perovskite solar cells (PSCs). architectural innovation is realized through development specialized material, termed dithiafulvene end-capped Spiro[fluorene-9,9′-xanthene], denoted by acronym AF32. In this architecture, thoughtfully attached to spiroxanthene fluorene core with phenothiazine as spacer unit, possessing multiple alkyl chains. AF32 passivates defects coordinating sulfur constituents frameworks uncoordinated Pb2+ cations on surface film, chains construct hydrophobic environment, preventing moisture from entering hydrophilic improving long-term stability PSCs. Furthermore, conductive interlayer facilitates hole transport PSCs due its well-aligned molecular orbital levels. Such improvements translated into enhanced power conversion efficiency (PCE) 22.6% for device employing 1.5 mg/mL AF32, it maintained 85% initial PCE after more than 1800 h under ambient conditions [illumination 45 ± 5% relative humidity (RH)]. not only marks progress photovoltaic technology but also expands our understanding manipulating properties optimized performance stability.