A novel interface layer for inverted perovskite solar cells fabricated in ambient air under high humidity conditions

CHOI F. P. , Alishah H. M. , Bozar S., Doyranli C., KOYUNCU S. , SAN N., ...More

SOLAR ENERGY, vol.209, pp.400-407, 2020 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 209
  • Publication Date: 2020
  • Doi Number: 10.1016/j.solener.2020.08.013
  • Title of Journal : SOLAR ENERGY
  • Page Numbers: pp.400-407
  • Keywords: Benzotriazol based small molecule, Hole transport layer, Electron blocking layer, Planar perovskite solar cells, Inverted structure, Perovskite grain size, PROBE FORCE MICROSCOPY, PLANAR, EFFICIENT, PERFORMANCE, CHALLENGES, FILM


A novel benzotriazol based small molecule (2-hexyl-4,7-bis(5'-hexyl-2,2'-bithien-5-yl)-2H-1,2,3-benzotriazole) "BTBT" was synthesized by Suzuki coupling reaction and was successfully employed in planar inverted perovskite solar cells with ITO/BTBT/PEDOT:PSS/CH3NH3PbI3-xCl(x)/PCBM/Al configuration. Fabrication processes, including the spin coating of the perovskite layer, were performed in ambient air, under high humidity conditions (>60%). BTBT/PEDOT:PSS bilayer notably improved the power conversion efficiencies (PCE) from 9.65% to 11.6%, which corresponds to an increase of 20%.