Structural changes and band gap tunability with incorporation of n-butylammonium iodide in perovskite thin film

• Published in: Heliyon 2020-02, Vol.6 (2), p.e03364, Article e03364
• Main Authors: Rebecca, Leong Wei Xian, Burhanudin, Zainal Arif, Abdullah, Mundzir, Saheed, Mohamed Shuaib Mohamed
• Format: Article
• Language: English
• Subjects: Bandgap tunability; Materials science; Organic-inorganic perovskite; Structural changes; Thin films
• ISSN: 2405-8440; 2405-8440
• DOI: 10.1016/j.heliyon.2020.e03364

The current work presents structural change and band gap tunability using hybrid organic-inorganic perovskite with the incorporation of long chain ammonium halide. Thin films of MAPbI3 with different ratio of n-butylammonium iodide (BAI) have been successfully deposited on the substrate using a single step coating technique. X-ray diffraction scans revealed the transition of the 3D structure of MAPbI3 to quasi-2D perovskite structure when BAI loading increase with a crystallite size range approximately 16 nm. This structural changeis reflected in the band gap as it increased from 1.59 eV for bulk crystal MAPbI3 to 2.13 eV for BAI and MAPbI3 ratio of 1:1. Correspondingly, photoluminescence measurement showed a blue shift in perovskite emission due to the transition of 3D to 2D layered structure perovskite. Raman spectra confirm that all fabricated films are of pristine quality and no corresponding degradation peaks of PbI2 is observed. These characteristics are important to address the single step deposition method of hybrid perovskite for perovskite solar cells application. Materials science; Organic-inorganic perovskite, Thin films; Structural changes; Bandgap tunability