Abstract
HighlightsThe first study dedicated to solving the problem of mixed intermediate phases in methylammonium (MA)-free (FA-Cs) Sn–Pb alloyed perovskite systems, new performance records of 21.61% and 23.82% realized for its single-junction and tandem devices.d-Homoserine lactone hydrochloride (D-HLH), employed as an additive, accelerates the transition from mixed intermediate phases into preformed perovskite nuclei.The presence of D-HLH eliminated the negative effect of mixed intermediate phases and regulated the crystallization kinetics.
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