MnCl2 doping increases phase stability of tin halide perovskites. (September 2021)

• Record Type: Journal Article
• Authors: Dawson, Margaret; Ribeiro, Caue; Morelli, Marcio Raymundo
• Is Part Of: Materials science in semiconductor processing. Volume 132(2021)
• Publication Date: 2021-09
• Subjects: Tin halide perovskite -- Manganese doping -- Perovskite stability -- Solar energy material -- Lead-free perovskite -- Ceramic; Semiconductors -- Periodicals; Integrated circuits -- Materials -- Periodicals; Semiconducteurs -- Périodiques; Circuits intégrés -- Matériaux -- Périodiques; Electronic journals; 621.38152
• DOI: 10.1016/j.mssp.2021.105908
• Languages: English
• ISSNs: 1369-8001

Abstract

Abstract: Tin halide perovskite (CH3 NH3 SnI3 ) suffers from instability due to the oxidation of tin(II). Doping tin(II) with cations can modify the properties of CH3 NH3 SnI3 and consequently, its stability. The gains and associated mechanisms differ according to cation. Here, MnCl2 is highlighted as a potential transition metal dopant. Using MnCl2, 2 and 10 mol% Mn doped CH3 NH3 SnI3 films were synthesized by the one-step method and characterized. Based on X-ray diffraction and micro-Raman measurements, the perovskite structure is formed irrespective of MnCl2 doping. The distribution of Mn was satisfactory as per Energy Dispersive X-ray mapping and chlorine from the precursor is not eliminated. Thus, must be considered when choosing MnCl2 as a dopant. The diffraction patterns of aged samples (24 h in air) indicate partial stabilization with Mn doping. From X-ray photoelectron spectroscopy (XPS) analysis, the stability of tin(II) in 10% Mn was slightly improved, tin vacancies were reduced and SnO2 formation was lowered despite Sn(IV) species being a little higher than the pristine sample. In general, the findings are promising for the development of stable tin perovskite solar cells. Highlights: Mn doped CH3 NH3 SnI3 were prepared with manganese chloride. Manganese at a level of 10 mol% did not disrupt perovskite structure. The stability of CH3 NH3 SnI3 was partially improved with manganese.