Optimization of Lead-free Organic–inorganic Tin(II) Halide Perovskite Semiconductors by Scanning Electrochemical Microscopy

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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  • Li Ji
  • Minshu Du
  • Ji Zhao
  • Edward T. Yu
  • Allen J. Bard


Original languageEnglish
Pages (from-to)205-210
Journal / PublicationElectrochimica Acta
Publication statusPublished - 1 Dec 2016
Externally publishedYes


Lead-free organic-inorganic tin halide perovskites were prepared and investigated by a rapid screening technique utilizing a modified scanning electrochemical microscope (SECM). We studied liquid junction photoelectrochemical (PEC) solar cells based on p-type methylammonium tin halide (MASnI3-xBrx) perovskites employing the benzoquinone (BQ) redox couple, BQ/BQ[rad], in dichloromethane (CH2Cl2). We found that the optimized Sn-based mixed halide perovskite, MASnI0.5Br2.5, exhibits enhanced performance and stability in liquid-junction PEC solar cells, with a power conversion efficiency of 1.51% (an increase of 20.8%) and a photovoltaic lifetime of 175 min (an increase of 75.0%), in comparison to MASnI3 perovskites.

Research Area(s)

  • lead-free, liquid junction, non-toxic, perovskite, photoelectrochemistry, scanning electrochemical microscopy, semiconductor, solar cell, tin

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