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2022 - NATURE Communications

 

D. Zheng, F. Raffin, P. Volovitch, Th. Pauporté

Control of perovskite film crystallization and growth direction to target homogeneous monolithic structures.

Nature Commun., 13 (2022) 6655. 

Here we show how the initial solution composition affects, first, the film formed by spin coating and anti-solvent dripping and, second, the processes occurring upon thermal annealing, including crystal domain evolution and the grain growth mechanism. We propose a universal typology which distinguishes three types for the growth direction of perovskite crystals: downward (Type I), upward (Type II) and lateral (Type III). The latter results in large, monolithic grains and we show that this mode must be targeted for the preparation of efficient perovskite light absorber thin films of solar cells.

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2022 - adv. energy mater.

D. Zheng, T. Zhu, Y. Yan, Th. Pauporté

Controlling the formation process of methylammonium-free halide perovskite films for a homogeneous incorporation of alkali metal cations beneficial to solar cell performances

Adv. Energy Mater., (2022) DOI:10.1002/aenm.202103618.

 

We show that ammonium chloride additive in the precursor solution governs the even depth distribution of alkali metal (IA) elements in methylammonium-free perovskites, favors the crystallinity and phase purity and induces a lateral growth of large monolithic film grains. Combined with the surface treatment by n-propylammonium iodide (PAI), it results in solar cells with high photovoltaic performances and improved stability.

2022 - SMALL Methods

D. Zheng, P. Volovitch and Th. Pauporté* 

What Can Glow Discharge Optical Emission Spectroscopy (GD-OES) Technique Tell Us About Perovskite Solar Cell? 

Small Methods 18 (2022) 2200633.

DOI: 10.1002/smtd.202200633

We review the emerging broad range of applications of the glow discharge optical emission spectroscopy (GD-OES) technique in the field of perovskite solar cells (PSCs) research..

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