Nonmonotonic Photostability of BA 2 MA n -1 Pb n I 3 n +1 Homologous Layered Perovskites.
Natalia N UdalovaSergey A FateevElizaveta M NemyginaAndrea ZanettaGiulia GranciniEugene A GoodilinAlexey B TarasovPublished in: ACS applied materials & interfaces (2021)
Layered lead halide perovskites (2D LHPs) are attracting considerable attention as a promising material for a new generation of solar cell devices. LHPs have been presented as a more stable alternative to the more widespread 3D bulk perovskite materials; however, a critical analysis of their photostability is still lacking. In this work, we perform a comparative study between BA 2 MA n -1 Pb n I 3 n +1 (BA─butylammonium and MA─methylammonium) 2D LHPs with different dimensionalities ( n = 1-3) and MAPbI 3 3D perovskites. We compare different stability testing protocols including photometrical determination of iodine-containing products in nonpolar solvents, X-ray diffraction, and photoluminescence (PL) spectroscopy. The resulting trends of the photostability in an inert atmosphere based on PL spectroscopy measurements demonstrate a nonmonotonic dependence of the degradation rate on the perovskite layer thickness n with a "stability island" at n ≥ 3, which is caused by a combination of antibate factors of electronic structures and chemical compositions in the family of 2D perovskites. We also identify a critical oxygen concentration in the surrounding environment that affects the mechanism and strongly enhances the rate of layered perovskite photodegradation.
Keyphrases
- solar cells
- high resolution
- heavy metals
- highly efficient
- reduced graphene oxide
- single molecule
- dual energy
- single cell
- transition metal
- quantum dots
- dna repair
- ion batteries
- cell therapy
- solid state
- mass spectrometry
- computed tomography
- risk assessment
- stem cells
- magnetic resonance imaging
- crystal structure
- bone marrow