Synthesis and Opto-electrical properties of Transition metal alloyed Lead- free layered perovskite nanocrystals.
James Martin a, Samrana Kazim a b d, Shahzada Ahmad a d, Luis Lezama c
a BCMaterials, Basque Center for Materials, Applications and Nanostructures, UPV/EHU Science Park, 48940 Leioa, Spain
b Materials Physics Center (CFM-MPC), 20018 Donostia - San Sebastian, Spain
c Departamento de Química Inorgánica, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Sarriena s/n, 48940 Leioa, Spain
d IKERBASQUE, Basque Foundation for Science, 48009, Bilbao, Spain
Poster, James Martin, 194
Publication date: 6th February 2024

In recent years, lead (Pb)-halide perovskite has garnered the scientific community's attention due to its impressive optoelectronic properties.[1] However, the inherent toxicity of Pb, its regulation, and concerns over stability, have hindered its commercial viability and limited the optoelectronic applications of lead halide perovskites to the laboratory.[1] This has been a driving force for the development of Pb-free perovskite-related materials, leading to the exploration of “Elpasolites” metal halide double perovskites (HDP) and layered metal halide double perovskites (LHDP).[1-3] In theory this has been a promising avenue of research with both HDPs A₂M(I)M(III)X₆ and LHDPs A₄M(II)M(III)₂X₁₂ having increased compositional space.[3] While the development of HDPs has solved concerns of Pb toxicity and shows improved stability compared to lead halide perovskites, they´ve generally exhibited indirect and unsuitable bandgaps, alongside difficulty with the fabrication of homogenous films for device applications.[1-3]  LHDPs have also been demonstrated to have increased stability relative to lead halide perovskites, have more suitable bandgaps for photovoltaics applications compared to HDPs, and are easy to modulate their optical and magnetic properties.[4] Of the LHDPs Cs₄CuSb₂Cl₁₂ has shown promising optoelectronic properties with high stability and wide spectral absorbance and tuneable bandgap through the effects of quantum confinement.[5] In this work we have focused on the synthesis of the LDHP Cs₄CuSb₂Cl₁₂ nanocrystals by hot injection method which exhibit higher bandgap (~1.92 eV) compared to its bulk materials (~1.0 eV)[5]. Further, its intermediate alloys with transition metals have been explored to modulate their optoelectrical and structural properties for their implementation in optoelectronics and other applications.[5]

We would like to thank the Spanish Ministry of Science and Innovation (ARISE, PID2019111774RB-100) & HERALD (FUNDACIÓN BBVA) for financial assistance.

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