Multifunctional molecular modulators for perovskite solar cells with over 20% efficiency and high operational stability.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 30367070.
- Also identified by DOI 10.1038/s41467-018-06709-w and PMC identifier 6203709.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Perovskite solar cells present one of the most prominent photovoltaic technologies, yet their stability, scalability, and engineering at the molecular level remain challenging. We demonstrate a concept of multifunctional molecular modulation of scalable and operationally stable perovskite solar cells that exhibit exceptional solar-to-electric power conversion efficiencies. The judiciously designed bifunctional molecular modulator SN links the mercapto-tetrazolium (S) and phenylammonium (N) moieties, which passivate the surface defects, while displaying a structure-directing function through interaction with the perovskite that induces the formation of large grain crystals of high electronic quality of the most thermally stable formamidinium cesium mixed lead iodide perovskite formulation. As a result, we achieve greatly enhanced solar cell performance with efficiencies exceeding 20% for active device areas above 1 cm<sup>2</sup> without the use of antisolvents, accompanied by outstanding operational stability under ambient conditions.