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Multifunctional Molecular Modulators for Perovskite Solar Cells With Over 20% Efficiency and High Operational Stability

Multifunctional Molecular Modulators for Perovskite Solar Cells With Over 20% Efficiency and High Operational Stability

Dongqin Bi, Xiong Li, Jovana V Milić, Dominik J Kubicki, Norman Pellet, Jingshan Luo, Thomas LaGrange, Pierre Mettraux, Lyndon Emsley, Shaik M Zakeeruddin, Michael Grätzel

Nat Commun. 2018 Oct 26;9(1):4482.

PMID: 30367070

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 cm2 without the use of antisolvents, accompanied by outstanding operational stability under ambient conditions.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP45497732	Phenylammonium iodide		45497-73-2	Price

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