Low‐Cost TiS₂ as Hole‐Transport Material for Perovskite Solar Cells

Abstract

Abstract A room‐temperature low‐cost TiS 2 p‐type contact material is applied for the first time as the hole‐transporting material (HTM) in perovskite solar cells, with power conversion efficiencies surpassing 13.5%. Synthesized by a simple two‐step hot‐injection method, it presents a much lower price per m 2 than octakis(4‐methoxyphenyl)‐9,9′‐spirospirobi[9H‐fluorene]‐2,2′,7,7′‐tetramine (spiro‐OMeTAD), 30 times lower in price ($0.046 for TiS 2 and $1.36 for spiro‐OMeTAD at 13.54% efficiency), standing out over most of the reported HTM alternatives.