Double-side 2D/3D heterojunctions for inverted perovskite solar cells

by Randi Azmi, Drajad Satrio Utomo, Badri Vishal, Shynggys Zhumagali, Pia Dally, Andi Muhammad Risqi, Adi Prasetio, Esma Ugur, Fangfang Cao, Imil Fadli Imran, Ahmed Ali Said, Anil Reddy Pininti, Anand Selvin Subbiah, Erkan Aydin, Chuanxiao Xiao, Sang Il Seok, Stefaan De Wolf
Article Year: 2024 ISSN: ISSN 1476-4687 (online) DOI:


Azmi, R., Utomo, D. S., Vishal, B., Zhumagali, S., Dally, P., Risqi, A. M., Prasetio, A., Ugur, E., Cao, F., Imran, I. F., Said, A. A., Pininti, A. R., Subbiah, A. S., Aydin, E., Xiao, C., Seok, S. il, & de Wolf, S


Defects at the top and bottom interfaces of three-dimensional (3D) perovskite photoabsorbers diminish the performance and operational stability of perovskite solar cells owing to charge recombination, ion migration and electric-field inhomogeneities1,2,3,4,5. Here we demonstrate that long alkyl amine ligands can generate near-phase-pure 2D perovskites at the top and bottom 3D perovskite interfaces and effectively resolve these issues. At the rear-contact side, we find that the alkyl amine ligand strengthens the interactions with the substrate through acid–base reactions with the phosphonic acid group from the organic hole-transporting self-assembled monolayer molecule, thus regulating the 2D perovskite formation. With this, inverted perovskite solar cells with double-side 2D/3D heterojunctions achieved a power conversion efficiency of 25.6% (certified 25.0%), retaining 95% of their initial power conversion efficiency after 1,000 h of 1-sun illumination at 85 °C in air.


Double-side 2D/3D heterojunctions