from Sinopharm Chemical Reagent Co., Ltd., China. PEDOT:PSS (Clevios
PH1000) was purchased from Heraeus Precious Metals North America.
PEO (with a molecular weight (Mw) of 500
g mol–1) was purchased from Scientific Polymer Inc.
PC61BM (99.5%) was purchased from Solenne BV. Lead iodide
(PbI2, 99.999%, beads), anhydrous N,N-dimethylformamide (DMF, 99.8%), ethanol (CH3CH2OH, 99.5%), anhydrous chlorobenzene (CB, 99.8%), and
anhydrous toluene (99.8%) were purchased from Sigma-Aldrich. All chemicals
were used as received without further purification. Methylammonium
iodide (CH3NH3I) and LiSPS were synthesized
in our labortary.18 (link),19 (link) NdCl3 precursor solution
was prepared by adding Nd2O3 into HCl (37% w)
with an accurate stoichiometric ratio and then accompany with the
addition of DMF solvent. The Nd-doped PbI2 precursor solution
was prepared by mixing NdCl3 precursor solution with 0.87
M PbI2 in DMF with the fixing molar ratio of Nd to Pb equal
to 0.5%.