Phys.org October 15, 2024 By using semiconducting hybrid perovskite as an exploratory platform, a team of researchers in the US (Northern Illinois University, Argonne National Laboratory) discovered that Nd2+ doped CH3NH3PbI3 (MAPbI3) perovskite exhibited a Kondo-like exciton-spin interaction under cryogenic and photoexcitation conditions. From a mechanistic standpoint, such extended charge separation states are the consequence of the trap state enabled by the antiferromagnetic exchange interaction between the light-induced exciton and the localized 4 f spins of the Nd2+ in the proximity. Importantly, this Kondo-like exciton-spin interaction can be modulated leading to exciton recombination at the dynamics comparable to pristine MAPbI3… read […]
Tag Archives: Perovskite
Ammonium is the secret ingredient in stable, efficient & scalable perovskite solar cells
EurekAlert December 20, 2022 Controlling the crystallization process of perovskite thin films to obtain a high-quality material is one of the most challenging aspects for upscaling perovskite solar cell (PSC) technology. However, to date, lead acetate has been used exclusively as a precursor for the synthesis of methylammonium (MA) or cesium (Cs) based perovskites, which are unstable and less efficient. Researchers in Australia produced high-quality large-area formamidinium–caesium mixed-cation perovskite films by blade-coating a lead acetate-based precursor formulation in an ambient laboratory environment, with the use of NH4+ as a volatile cation to drive off acetate during annealing, leading to formation […]
One material with two functions could lead to faster memory
Science Daily August 23, 2021 Previous versions of light-emitting memories required the integration of two separate devices with differing materials, complicating fabrication. Using just one perovskite layer between contacts an international team of researchers (Taiwan, Japan) fabricated a device that works both as a RRAM and a light-emitting electrochemical cell. By taking advantage of the fast, electrically switchable ionic motion that enables this dual functionality in a single layer of perovskite they connected two devices together and developed an all-inorganic perovskite light-emitting memory. They used perovskite quantum dots of two different sizes for the two devices in the light-emitting memory […]