# Weak Hydrogen Bond with Iodide Modulating Crystallization of Methylammonium Lead Iodide for High-Performance Perovskite Solar Cells

## TL;DR

A weak hydrogen bond involving iodide improves the crystallization of perovskite films, leading to more efficient and stable solar cells.

## Contribution

A novel use of weak hydrogen bonds between MAI and glycerol to enhance perovskite film quality and solar cell performance.

## Key findings

- Glycerol incorporation increases grain size and reduces carrier recombination in perovskite films.
- Glycerol-doped solar cells achieved a power conversion efficiency of 16.84%.
- The solar cells retained 92.05% of their initial efficiency after 30 days of storage.

## Abstract

The weak hydrogen bond with methylammonium iodide (MAI) dominates the formation of methylammonium lead iodide (MAPbI3) during its nucleation and growth process. Herein, a weak hydrogen bond involving iodide is designed between the MAI and glycerol molecule in mixed solvents containing N, N-dimethylformamide (DMF) and dimethyl sulfoxide (DMSO) to delay the growth of MAPbI3 film. Incorporation of glycerol into the perovskite film indicates a larger grain size and suppressed nonradiative recombination of carriers in the film. Finally, the glycerol-doped perovskite solar cells (PSCs) achieve a champion power conversion efficiency (PCE) of up to 16.84%, with excellent stability to retain 92.05% of their initial PCE after 30 days of storage. The above results unveil a deep understanding of weak hydrogen bonds in high-performance perovskite photovoltaics.