[16a-K405-1~9] 12.5 Organic and hybrid solar cells

10:45 AM - 11:00 AM JST(1:45 AM - 2:00 AM UTC)

[16a-K405-7] Alkyl-primary-ammonium-based ionic liquid allowing spontaneous perovskite passivation during deposition of hole transport materials

〇Naoyuki Nishimura¹, Hiroaki Tachibana¹, Ryuzi Katoh², Hiroyuki Kanda¹, Takurou Murakami¹ (1.AIST, 2.Nihon Univ.)

Keywords:

ionic liquid,Perovskite solar cells

An ionic liquid based on alkyl-primary-ammonium (n-octylammonium bis(trifluoromethylsulfonyl)imide (OA-TFSI)) was developed as additive for a Spiro-OMeTAD hole transport material (HTM) in perovskite solar cells (PSCs) and exhibits specific functions; during the HTM deposition process, OA cations in the HTM solution spontaneously passivated the perovskite layer. As a consequence, the use of OA-TFSI enhanced photovoltaic performance of PSCs, compared to those with Li-TFSI, and improved stability against humidity exploiting hydrophobicity of aliphatic moiety in the OA cation being over the perovskite surface.