Abstract
Organic-inorganic lead iodide perovskite is an ideal candidate material for high performance photovoltaic and optoelectronic devices. In this paper, we synthesize hexagonal formamidinium lead iodide CH(NH2)2PbI3 (δ-FAPbI3) perovskite nanorods by a simple chemical solution method, the δ-FAPbI3 perovskite nanorods are then converted to black α-FAPbI3 with photoluminescence emission. Morphology and crystal structure of the FAPbI3 perovskite nanorods are characterized. Temperature-dependent photoluminescence of the α-FAPbI3 perovskite nanorods shows that near band edge emission blue-shifts when the temperature increases from 10K to 120K, then the emission band demonstrates a sudden redshift near 150K due to phase transition from tetragonal phase to cubic phase, and the emission band blue-shifts again from 150K to room temperature. The PL intensity decrease exponentially with the increase of the temperature. Temperature coefficients of the band gap and thermal activation energies of α-FAPbI3 perovskite nanorods are fitted from the temperature-dependent PL spectra.
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