Rebecca Leong Wei Xian, Burhanudin Zainal Arif, Abdullah Mundzir, Saheed Mohamed Shuaib Mohamed
Department of Fundamental & Applied Sciences, Universiti Teknologi PETRONAS, 32610, Seri Iskandar, Perak, Malaysia.
Centre of Innovative Nanostructures & Nanodevices (COINN), Universiti Teknologi PETRONAS, 32610, Seri Iskandar, Perak, Malaysia.
Heliyon. 2020 Feb 7;6(2):e03364. doi: 10.1016/j.heliyon.2020.e03364. eCollection 2020 Feb.
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 MAPbI 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 MAPbI 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 MAPbI to 2.13 eV for BAI and MAPbI 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 PbI is observed. These characteristics are important to address the single step deposition method of hybrid perovskite for perovskite solar cells application.
当前的工作展示了通过掺入长链卤化铵的有机-无机杂化钙钛矿实现的结构变化和带隙可调性。使用单步涂层技术已成功地在基板上沉积了具有不同正丁基碘化铵（BAI）比例的MAPbI薄膜。X射线衍射扫描显示，当BAI负载增加且微晶尺寸范围约为16 nm时，MAPbI的3D结构向准2D钙钛矿结构转变。这种结构变化反映在带隙上，其从块状晶体MAPbI的1.59 eV增加到BAI与MAPbI比例为1:1时的2.13 eV。相应地，光致发光测量表明，由于3D向2D层状结构钙钛矿的转变，钙钛矿发射出现蓝移。拉曼光谱证实所有制备的薄膜质量纯正，未观察到PbI相应的降解峰。这些特性对于解决用于钙钛矿太阳能电池应用的杂化钙钛矿单步沉积方法很重要。
