Roberto Brenes

TL;DR: In this paper, a multi-scale investigation was conducted to reveal that lattice strain is directly associated with enhanced defect concentrations and non-radiative recombination in perovskite thin films.

TL;DR: In this article, a post-treatment of polycrystalline perovskite films with light and atmospheric treatments was shown to increase the internal luminescence quantum efficiencies from 1% to 89%, with carrier lifetime of 32 μ s and diffusion length of 77 μ m.

TL;DR: Efficient and stable LEDs processed from solution with tunable color enabled by using phase-pure 2D Ruddlesden-Popper (RP) halide perovskites with a formula (CH3 (CH2 )3 NH3 )2 (CH4 NH3)n-1 Pbn I3n+1 are reported.

TL;DR: In situ microphotoluminescence measurements are used to elucidate the impact of light-soaking individual methylammonium lead iodide grains in high-quality polycrystalline films while immersing them with different atmospheric environments, revealing a unique insight into the nature of nonradiative decay and the impactof atmospheric passivation on the microscale properties of perovskite films.

TL;DR: X-ray diffraction and micro-photoluminescence measurements are used to show that there is a coexistence of both tetragonal and orthorhombic phases through the low-temperature phase transition, and that cycling through this transition can lead to structural changes and enhanced optoelectronic properties.