Improving the Carrier Lifetime of Tin Sulfide via Prediction and Mitigation of Harmful Point Defects

Alex Polizzotti*, Alireza Faghaninia, Jeremy R. Poindexter, Lea Nienhaus, Vera Steinmann, Robert L.Z. Hoye, Alexandre Felten, Amjad Deyine, Niall M. Mangan, Juan Pablo Correa-Baena, Seong Sik Shin, Shaffiq Jaffer, Moungi G. Bawendi, Cynthia Lo, Tonio Buonassisi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


Tin monosulfide (SnS) is an emerging thin-film absorber material for photovoltaics. An outstanding challenge is to improve carrier lifetimes to >1 ns, which should enable >10% device efficiencies. However, reported results to date have only demonstrated lifetimes at or below 100 ps. In this study, we employ defect modeling to identify the sulfur vacancy and defects from Fe, Co, and Mo as most recombination-active. We attempt to minimize these defects in crystalline samples through high-purity, sulfur-rich growth and experimentally improve lifetimes to >3 ns, thus achieving our 1 ns goal. This framework may prove effective for unlocking the lifetime potential in other emerging thin-film materials by rapidly identifying and mitigating lifetime-limiting point defects.

Original languageEnglish (US)
Pages (from-to)3661-3667
Number of pages7
JournalJournal of Physical Chemistry Letters
Issue number15
StatePublished - Aug 3 2017

ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry


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