Title | Amorphous Tin Oxide as Low Temperature-Processed Electron Transport Layer for Organic and Hybrid Perovskite Solar Cells. |
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Authors | Barbe, J.; Tietze, M.L.; Neophytou, M.; Murali, B.; Alarousu, E.; Labban, A.El; Abulikemu, M.; Yue, W.; Mohammed, O.F.; McCulloch, I.; Amassian, A.; Del Gobbo, S. |
Journal | ACS Appl Mater Interfaces |
DOI | 10.1021/acsami.6b13675 |
Abstract |
The chemical bath deposition of tin oxide (SnO2) thin films as electron transporting layer (ETL) in planar heterojunction n-i-p organohalide lead perovskite and organic bulk heterojunction solar cells is reported. The amorphous SnO2 films are grown from a non-toxic aqueous bath of tin chloride at very low temperatures (55°C) and do not require post-annealing treatment to work very effectively as ETL in planar heterojunction n-i-p organohalide lead perovskite or organic bulk heterojunction solar cells, in lieu of the commonly used ETL materials TiO2 and ZnO, respectively. Ultraviolet photoemission spectroscopy measurements on the glass/ITO/SnO2/MAPbI3/Spiro-OMeTAD device stack indicate that extraction of photo-generated electrons is facilitated by a perfect alignment of the conduction bands at the SnO2/MAPbI3 interface, while the deep valence band of SnO2 ensures strong hole-blocking properties. Despite exhibiting very low electron mobility, the excellent interfacial energetics combined with high transparency (Egap,optical > 4 eV) and uniform substrate coverage make the amorphous SnO2 ETL prepared by chemical bath deposition an excellent candidate for potentially low cost and large scale fabrication of organohalide lead perovskite and organic photovoltaics. |
Amorphous Tin Oxide as Low Temperature-Processed Electron Transport Layer for Organic and Hybrid Perovskite Solar Cells.