Printing High-Quality Formanidinum Lead Triiodide Films: Understanding the Critical Role of α-Phase Nucleation Before Thermal Annealing

Qiu S, Dong L, Jang D, Yang F, García Cerrillo J, Li C, Xie Z, Luo J, Guo F, Distler A, Du T, Brabec C, Egelhaaf HJ (2024)

Publication Language: English

Publication Type: Journal article

Publication year: 2024

Journal

Article Number: 2402616

DOI: 10.1002/aenm.202402616

Abstract

Upscaling the coating of formamidinium lead triiodide (FAPbI3) thin film is essential to realizing full printing and thereby roll-to-roll production of perovskite photovoltaics. However, thin-film FAPbI3 processed from antisolvent-free, printing methods suffer from undesirable degradation to the non-photoactive phase, particularly in ambient processing conditions. Here, the most critical stage in thin-film processing is identified as the gas-quenching treatment of the as-cast wet film. It is crucial to achieve both the nucleation of α-phase nanocrystals and their sufficient growth at room temperature, which are indispensable for templating the growth of a highly crystalline and stable α-FAPbI3 film during subsequent thermal annealing. The gas-quenching-treated film without these α-phase nanocrystals can only be converted to meta-stable α-FAPbI3 by thermal annealing. By precisely identifying the spontaneous doping of cesium ion (Cs⁺) as a key factor in triggering α-FAPbI3 nucleation and the role of chloride ion (Cl⁻) in enhancing nanocrystal growth, a generalized mechanism for additive engineering for the precursor ink is theorized. The identified mechanism translates to a power conversion efficiency of 19.36% for fully printed carbon-electrode solar cells, 16.23% for carbon-electrode minimodules, and excellent operational stability, showing the promising potential of this proposed fabrication route in the upscaling of perovskite photovoltaics.

Authors with CRIS profile

Involved external institutions

Jinan University China (CN) Soochow University, Suzhou / 苏州大学 China (CN)

How to cite

APA:

Qiu, S., Dong, L., Jang, D., Yang, F., García Cerrillo, J., Li, C.,... Egelhaaf, H.-J. (2024). Printing High-Quality Formanidinum Lead Triiodide Films: Understanding the Critical Role of α-Phase Nucleation Before Thermal Annealing. Advanced Energy Materials. https://doi.org/10.1002/aenm.202402616

MLA:

Qiu, Shudi, et al. "Printing High-Quality Formanidinum Lead Triiodide Films: Understanding the Critical Role of α-Phase Nucleation Before Thermal Annealing." Advanced Energy Materials (2024).

BibTeX: Download