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Science and Technology Indonesia
Published by Universitas Sriwijaya
ISSN : 25804405     EISSN : 25804391     DOI : -
Core Subject : Science, Social, Engineering,
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Environmental Science Materials Science & Nanotechnology Physics
An international Peer-review journal in the field of science and technology published by The Indonesian Science and Technology Society. Science and Technology Indonesia is a member of Crossref with DOI prefix number: 10.26554/sti. Science and Technology Indonesia publishes quarterly (January, April, July, October). Science and Technology Indonesia is an international scholarly journal on the field of science and technology aimed to publish a high-quality scientific paper including original research papers, reviews, short communication, and technical notes. This journal welcomes the submission of articles that covers a typical subject of natural science and technology such as: > Chemistry > Biology > Physics > Marine Science > Pharmacy > Chemical Engineering > Environmental Science and Engineering > Computational Engineering > Biotechnology Journal Commencement: October 2016
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Articles 551 Documents
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The Synthesis of CH₃NH₃PbI₃₋ₓBrₓ under Uncontrolled Humidity for Perovskite Solar Cell Application Kusumawardani, Cahyorini; Ikhsan, Jaslin; Budiasih, Kun Sri; Herlambang Nugroho; Widowati, Asri
Science and Technology Indonesia Vol. 11 No. 1 (2026): January
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2026.11.1.298-310

Abstract

CH₃NH₃PbI₃₋ₓBrₓ perovskite films were successfully synthesized under uncontrolled humidity using a two-step spin-coating method followed by Ostwald ripening (OR) treatment. Bromide incorporation into CH₃NH₃PbI₃ was achieved by diluting the pre-formed CH₃NH₃PbI₃ films with CH₃NH₃Br (MABr) solutions at various concentrations. X-ray diffraction (XRD) analysis confirmed the formation of a tetragonal perovskite phase with reduced lattice parameters as the bromide concentration increased, indicating successful substitution of I⁻ by Br⁻ ions. Scanning electron microscopy (SEM) and energy-dispersive X-ray (EDX) characterization showed that moderate bromide incorporation (30–40 mg/mL) produced dense and uniform grains with homogeneous halide distribution, whereas excessive MABr resulted in non-uniform morphology and halide segregation, particularly under humid conditions. Optical analysis revealed a gradual blue shift of the absorption edge, consistent with band gap widening due to lattice contraction. Photovoltaic performance measurements demonstrated that higher MABr concentrations led to decreased current density and fill factor, attributed to excessive bromide content and defect formation. These findings indicate that controlled bromide incorporation via Ostwald ripening using an MABr concentration of 20 mg/mL effectively enhances the structural quality, film stability, and photovoltaic performance of CH₃NH₃PbI₃₋ₓBrₓ perovskite solar cells under humid environments.

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