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

Research output: Contribution to journalArticle

169 Citations (Scopus)

Abstract

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
Pages (from-to)15379-15385
Number of pages7
JournalJournal of the American Chemical Society
Volume136
Issue number43
DOIs
Publication statusPublished - Oct 29 2014

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Solar cells
Air
Oxidation
Coloring Agents
Tin
Porphyrins
Energy conversion
Perovskite
Conversion efficiency
Moisture
Photons
Dyes
Lead
Doping (additives)
Atmosphere
Costs
Costs and Cost Analysis
Equipment and Supplies
Dye-sensitized solar cells
perovskite

ASJC Scopus subject areas

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

Cite this

Air-stable molecular semiconducting iodosalts for solar cell applications : Cs2SnI6 as a hole conductor. / Lee, Byunghong; Stoumpos, Constantinos C.; Zhou, Nanjia; Hao, Feng; Malliakas, Christos; Yeh, Chen Yu; Marks, Tobin J; Kanatzidis, Mercouri G; Chang, Robert P. H.

In: Journal of the American Chemical Society, Vol. 136, No. 43, 29.10.2014, p. 15379-15385.

Research output: Contribution to journalArticle

Lee, Byunghong ; Stoumpos, Constantinos C. ; Zhou, Nanjia ; Hao, Feng ; Malliakas, Christos ; Yeh, Chen Yu ; Marks, Tobin J ; Kanatzidis, Mercouri G ; Chang, Robert P. H. / Air-stable molecular semiconducting iodosalts for solar cell applications : Cs2SnI6 as a hole conductor. In: Journal of the American Chemical Society. 2014 ; Vol. 136, No. 43. pp. 15379-15385.
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