Preparation of nanocomposites of PbS quantum dots dispersed in MAPbI3 matrix from precursor solution of Pb xanthate

Daisuke Hirotani, Kohei Nishimura, Yaohong Zhang, Qing Shen and Shuzi Hayase

Abstract

Organic-inorganic hybrid perovskites attract attentions because of their unique electro-optical properties which are expected to be applied to various devices. The perovskite compounds are generally prepared from precursor solutions consisting of two materials, AX and BX₂ for ABX₃. Generally, methylammonium lead triiodide (MAPbI₃) perovskite is formed from the precursor solution consisting of methylammonium iodide (MAI) and lead iodide (PbI₂). In this report, we select Pb(-S-C(S)-OR)₂ (lead xanthate, abbreviated as Pb(XT)₂) as the perovskite precursor instead of PbI₂. We found that the precursor solutions consisting of the MAI and the Pb(XT)₂ give nanocomposites consisting of MAPbI₃ and PbS nanomaterials including PbS quantum dot without changing the MAPbI₃ bandgap. In this report, nanocomposites prepared from precursors consisting of Pb(XT)₂/MAI with various ratios are analysed by using XRD, XPS, TG-DTA, TEM and UV/VIS spectroscopy.