Seed-Assisted Growth of Methylammonium-Free Perovskite for Efficient Inverted Perovskite Solar Cells.

The traditional way to stabilize α-phase formamidinium lead triiodide (FAPbI ) perovskite often involves considerable additions of methylammonium (MA) and bromide into the perovskite lattice, leading to an enlarged bandgap and reduced thermal stability. This work shows a seed-assisted growth strategy to induce a bottom-up crystallization of MA-free perovskite, by introducing a small amount of α-CsPbBr /DMSO (5%) as seeds into the pristine FAPbI system. During the initial crystalization period, the typical hexagonal α-FAPbI crystals (containing α-CsPbBr seeds) are directly formed even at ambient temperature, as observed by laser scanning confocal microscopy.

Charge Injection and Electrical Response in Low-Temperature SnO-Based Efficient Perovskite Solar Cells.

Defining low-temperature engineering protocols for efficient planar perovskite solar cell (PSC) preparation is important for fabrication simplification and low-cost production. In the present work, we have defined a low-temperature (123 °C) protocol for the preparation from a solution of SnO layers which are efficient for an application as an electron transporting layer (ETL) in PSCs. Thin, conformal, and transparent layers have been obtained.

Sunlight activated long-lasting luminescence from Ba5Si8O21: Eu(2+),Dy(3+) phosphor.

Visible-light persistent phosphors are commonly used as self-sustained night vision and fluorescence labeling materials. From the inspiration of the structure of six-membered rings plane in Ba4(Si3O8)2, a similar structure of Ba5Si8O21 is expected that could exhibit more excellent phosphorescence property. In this Article, we report a novel visible long-lasting luminescence phosphor of Eu(2+)/Dy(3+) codoped Ba5Si8O21 for the first time.