Presentation Information
[7p-S201-13]Uncovering the Origin of Fullerenes Superiorityas Electron Transport Layers in Perovskite Solar Cells
〇Ryota Tozaki1, Masato Iwasawa2, Aruto Akatsuka1, Hiroyuki Yoshida1,3 (1.Chiba Univ., 2.Nissan Chemical Corp., 3.Chiba Univ.)
Keywords:
Perovskite Solar Cell,Electron Transport Layer,Fullerene
In inverted perovskite solar cells, fullerene derivatives such as C60 are successfully used for the electron collection layer, but the underlying reason remains unclear. In this study, we compared C60 and PTCDA to investigate the origin of C60's superior performance. These materials have similar electron affinities, suggesting similar interface energy level alignment. In fact, UPS, LEIPS, XPS, and HAXPES analyses confirmed little difference in the energy level alignment between the two molecules. However, metastable atom electron spectroscopy measurements revealed that both molecules penetrate MAPbI3, with C60 showing a higher degree of infiltration. Therefore, we conclude that C60 distributes more deeply within MAPbI3, forming a broader band bending and enhancing electron collection.