Improving photoluminescence properties and reducing recombination of CsPbBr perovskite through lithium doping.

This study investigates the impact of lithium doping on the structural and photophysical properties of spin-coated CsPbBr perovskite thin films. The deposited films display a pristine structure, preferentially growing along the (220) direction, and exhibit high-quality green photoluminescence at around 530 nm. The doping leads to an improvement in the optical properties of the films, as evidenced by a stronger photoluminescence (PL) intensity compared to undoped CsPbBr, particularly at temperatures below 200 K.

Structural, morphological, dielectric and optical properties of double perovskites RBaFeTiO (R = La, Eu).

Double perovskites RBaFeTiO (R = La, Eu) were successfully synthesized using a solid state reaction route. Structural refinement analysis has been performed to investigate the details of the crystalline structure which was found to be a cubic double perovskite structure at room temperature (space group 3̄, No. 221).

Effect of doping on the phase stability and photophysical properties of CsPbIBr perovskite thin films.

In this study, we demonstrate that the crystallization process of CsPbIBr films can be modulated when small amounts of additives are added to the precursor solution, leading to the formation of the bright brownish α-phase perovskite films with high orientation along the [100] crystallographic direction. Doped CsPbIBr films exhibit improved crystallinity, with high coverage, large grain size and pinhole-free surface morphology, suitable for making high performance optoelectronic devices. We also explored the role of Cl in the photophysical properties of CsPbIBr perovskite films using the temperature dependent photoluminescence technique.

Optical properties of Ag -TiO 2 nanocermet films prepared by cosputtering and multilayer deposition techniques.

Ag -TiO2 nanocermet thin films, deposited for optical filtering applications by two sputtering techniques, codeposition and multilayer deposition, exhibit surface plasmon absorption in the spectral range 450 -500 nm. The cosputtering technique induces a columnar growth, whereas multilayer deposition produces a more-random distribution of silver inclusions. Both films have large, flat silver grains at the air -cermet interface.