[7p-S201-1~19] 12.5 Organic and hybrid solar cells

1:30 PM - 1:45 PM JST(4:30 AM - 4:45 AM UTC)

[7p-S201-3] Energy Levels and Molecular Orientation of Carbazole Derivative Monolayers on NiOx

〇(D)Aruto Akatsuka¹, David Garcia Romero², Maria Antonietta Loi², Hiroyuki Yoshida^1,3 (1.Chiba Univ., 2.Univ. of Groningen, 3.Chiba Univ.)

Keywords:

perovskite solar cell,hole collecting monolayer,molecular orientation

Carbazole-based hole collecting monolayers (HCMs) attract attention as hole collection layers in inverted perovskite solar cells. We developed an interfacial energy level alignment model for electrode/HCM/perovskite interfaces, explaining the impact of different HCMs on performance. In this model, alignment is governed by work function (WF) and ionization energy (IE) of HCM and perovskite. For ITO electrodes, the WF of HCM depends on electrode WF and a dipole layer. For NiOx electrodes, however, WF remained constant (~5.0 eV).The molecular orientation measurement using photoelectron spectroscopy shows that HCM on the NiOx adopts random orientation compared to on ITO leading to no dipole layer. We are now considering Fermi level pinning at NiOx defect states and dipole formation by charge transfer as well.