Defect induced room temperature ferromagnetism in methylammonium lead iodide perovskite

Abstract

The meteoric rise in the photovoltaic performance of organic-inorganic hybrid perovskite is a conspicuous reflection of its defect tolerance nature. The presence of lattice defect in organo lead halide perovskite can manipulate or even gives rise to some exceptional properties which otherwise would have remained unseen. One of such properties reported in this article is the experimental observation of defect mediated room temperature ferromagnetism in methylammonium lead halide perovskite for the very first time, ably supported by ab-initio calculations. Theoretical analysis predicts that the ferromagnetism principally arises from the iodine vacancies in the orthorhombic and cubic crystal phases but not in the tetragonal phase. The low temperature (100 K) ferromagnetic hysteresis loop was stable even at a high temperature of 380 K, substantiating the fact that the origin of magnetism embedded in its defective nature.