Work

Sequential Co‐Deposition of Perovskite Film: An Effective Way of Tailoring Bandgap in All Vacuum Processed Perovskite Solar Cells

Year: 2025

Type: article

Abstract: This study introduces a simple and effective way to control the bandgap of perovskite film by constructing bilayer film composed of methylammonium lead iodide (MAPbI 3 ) and formamidinium lead iodide (FAPbI 3 ) layers. The bilayer film is fabricated through the sequential co‐deposition of methylammonium iodide (MAI) and lead iodide (PbI 2 ), followed by formamidinium iodide (FAI) and PbI 2 . Interestingly, the bandgap of the bilayer film can be tuned from 1.60 to 1.51 eV by adjusting the thickness of each layer. X‐ray photoelectron spectroscopy (XPS) indicates that the highly diffusive methylammonium ions (MA + ) enables the formation of stable α‐phase with formamidinium ions (FA + ) in the bilayer perovskite film even without further thermal annealing. Bilayer film‐based perovskite solar cells (PSCs) are fabricated through an all‐vacuum deposition process. The bilayer PSC exhibits higher power conversion efficiency (PCE) of 17.0% compared to the single‐layer PSC based on MAPbI 3 or FAPbI 3 .

Source: Small Methods

DOI: 10.1002/smtd.202500104

Authors: Sojeong Lee, Young Seon Yoon, Shafidah Shafian, Jin Young Kim, Kyungkon Kim

Institutions: Ewha Womans University, Seoul National University, National University of Malaysia

Language: English

Topic: Perovskite Materials and Applications

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: bronze