Journal of Physical Chemistry Letters
Journal of Physical Chemistry Letters
5 years ago

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

Improving the Carrier Lifetime of Tin Sulfide via Prediction and Mitigation of Harmful Point Defects
Jeremy R. Poindexter, Tonio Buonassisi, Alireza Faghaninia, Vera Steinmann, Juan Pablo Correa-Baena, Amjad Deyine, Lea Nienhaus, Seong Sik Shin, Robert L. Z. Hoye, Alex Polizzotti, Niall M. Mangan, Shaffiq Jaffer, Alexandre Felten, Moungi G. Bawendi, Cynthia Lo
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.

Publisher URL: http://dx.doi.org/10.1021/acs.jpclett.7b01406

DOI: 10.1021/acs.jpclett.7b01406

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