Air-stable molecular semiconducting iodosalts for solar cell applications: Cs2SnI6 as a hole conductor

Byunghong Lee, Constantinos C. Stoumpos, Nanjia Zhou, Feng Hao, Christos Malliakas, Chen Yu Yeh, Tobin J. Marks, Mercouri G. Kanatzidis*, Robert P.H. Chang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

416 Scopus citations


We introduce a new class of molecular iodosalt compounds for application in next-generation solar cells. Unlike tin-based perovskite compounds CsSnI3 and CH3NH3SnI3, which have Sn in the 2+ oxidation state and must be handled in an inert atmosphere when fabricating solar cells, the Sn in the molecular iodosalt compounds is in the 4+ oxidation state, making them stable in air and moisture. As an example, we demonstrate that, using Cs2SnI6 as a hole transporter, we can successfully fabricate in air a solid-state dye-sensitized solar cell (DSSC) with a mesoporous TiO2 film. Doping Cs2SnI6 with additives helps to reduce the internal device resistance, improving cell efficiency. In this way, a Z907 DSSC delivers 4.7% of energy conversion efficiency. By using a more efficient mixture of porphyrin dyes, an efficiency near 8% with photon confinement has been achieved. This represents a significant step toward the realization of low-cost, stable, lead-free, and environmentally benign next-generation solid-state solar cells.

Original languageEnglish (US)
Pages (from-to)15379-15385
Number of pages7
JournalJournal of the American Chemical Society
Issue number43
StatePublished - Oct 29 2014

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry


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