Open AccessInfluence of molar ratio of MAI and PbI2 on synthesis of perovskite film
Author(s) -
Tung-Lung Wu,
Jenn-Kai Tsai,
Ya-Zhu Song,
Meng-Xiu Chen,
Tian-Chiuan Wu,
Kao-Wei Min,
Ming-Ta Yu,
Chi-Ting Ho
Publication year - 2021
Publication title -
modern physics letters b
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.293
H-Index - 44
eISSN - 1793-6640
pISSN - 0217-9849
DOI - 10.1142/s0217984921410165
Subject(s) - perovskite (structure) , materials science , molar ratio , molar , crystallization , iodide , energy conversion efficiency , photoelectric effect , chemical engineering , analytical chemistry (journal) , inorganic chemistry , catalysis , chemistry , organic chemistry , optoelectronics , medicine , dentistry , engineering
This study explores the influence of molar ratio of the synthetic solution of methylammonium iodide (MAI) and PbI 2 on perovskite solar cells. The complete perovskite crystals must be produced in a low-humidity environment. The substrate is spin-coated in the adjusted MAPbI 3 synthesis solution and annealed by using a nitrogen furnace tube to form perovskite crystals. During the crystallization of MAPbI 3 , some of the PbI 2 remains, which improves the efficiency of the perovskite solar cell. Therefore, we adjust the molar concentration of MAI to find the appropriate amount of the PbI 2 residual. We fix the MAI molar concentration at 1 M and adjust the PbI 2 molar concentration from 0.8 M to 1.4 M. The molar ratios of MAI and PbI 2 are, then, 1:0.8, 1:1, 1:1.2, and 1:1.4, respectively. Then, we use UV–vis, FE-SEM, and photoelectric conversion efficiency (PCE) measurements for comparing the growth of perovskite crystals and their photoelectric characteristics. The results show that 1.2 M of PbI 2 is the most appropriate concentration for perovskite solar cells among the adjusted concentrations.