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Halide perovskite solar cells can combine high photoconversion efficiency with high transmittance. Herein, we describe an innovative vacuum deposition method to prepare thin CH3NH3PbI3 (MAPbI3) layers for semitransparent perovskite solar cells. The method is based on two-step Low-Vacuum Proximity-Space-Effusion (LV-PSE: working pressure 2–4 × 10−2 mbar; source-substrate distance 1–3 cm) that guarantees high-quality at low production costs. The process parameter optimization was validated by theoretical calculation. We show that, during the process of CH3NH3I (MAI) deposition (second step) on PbI2 (first step) at a given substrate temperature, the conversion of the PbI2 film to MAPbI3 occurs from the top surface inward via an adsorption–incorporation–migration mechanism guided by the gradient of energetic MAI concentration. The quality of the final layer arises from this progressive conversion …
Royal Society of Chemistry
Publication date: 
1 Jan 2021

Emanuele Smecca, Vitantonio Valenzano, Salvatore Valastro, Ioannis Deretzis, Giovanni Mannino, Graziella Malandrino, Gianluca Accorsi, Silvia Colella, Aurora Rizzo, Antonino La Magna, Andrea Listorti, Alessandra Alberti

Biblio References: 
Volume: 9 Issue: 30 Pages: 16456-16469
Journal of Materials Chemistry A