Defect Induced Room Temperature Ferromagnetism in Methylammonium Lead Iodide Perovskite

TL;DR

This paper reports the first experimental observation of defect-induced room temperature ferromagnetism in methylammonium lead iodide perovskite, supported by theoretical calculations linking it to iodide vacancies.

Contribution

It introduces the discovery of room temperature ferromagnetism in hybrid perovskite due to defects, specifically iodide vacancies, supported by experimental and ab-initio analysis.

Findings

Ferromagnetism observed at room temperature in methylammonium lead iodide perovskite.

Iodide vacancies are identified as the primary cause of ferromagnetism.

Ferromagnetic hysteresis remains stable up to 380 K.

Abstract

The defect tolerance nature of organic-inorganic hybrid perovskite is reflected from its stupendous growth in photovoltaic performances. The presence of lattice defect 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 the ferromagnetism principally arises from the iodide 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.