1 research outputs found
Amorphous Tin Oxide as a Low-Temperature-Processed Electron-Transport Layer for Organic and Hybrid Perovskite Solar Cells
Chemical
bath deposition (CBD) of tin oxide (SnO<sub>2</sub>) thin films as
an electron-transport layer (ETL) in a planar-heterojunction nāiāp
organohalide lead perovskite and organic bulk-heterojunction (BHJ)
solar cells is reported. The amorphous SnO<sub>2</sub> (a-SnO<sub>2</sub>) films are grown from a nontoxic aqueous bath of tin chloride
at a very low temperature (55 Ā°C) and do not require postannealing
treatment to work very effectively as an ETL in a planar-heterojunction
nāiāp organohalide lead perovskite or organic BHJ solar
cells, in lieu of the commonly used ETL materials titanium oxide (TiO<sub>2</sub>) and zinc oxide (ZnO), respectively. Ultraviolet photoelectron
spectroscopy measurements on the glass/indiumātin oxide (ITO)/SnO<sub>2</sub>/methylammonium lead iodide (MAPbI<sub>3</sub>)/2,2ā²,7,7ā²-tetrakisĀ(<i>N</i>,<i>N</i>-di-<i>p</i>-methoxyphenylamine)-9,9ā²-spirobifluorene
device stack indicate that extraction of photogenerated electrons
is facilitated by a perfect alignment of the conduction bands at the
SnO<sub>2</sub>/MAPbI<sub>3</sub> interface, while the deep valence
band of SnO<sub>2</sub> ensures strong hole-blocking properties. Despite
exhibiting very low electron mobility, the excellent interfacial energetics
combined with high transparency (<i>E</i><sub>gap,optical</sub> > 4 eV) and uniform substrate coverage make the a-SnO<sub>2</sub> ETL prepared by CBD an excellent candidate for the potentially low-cost
and large-scale fabrication of organohalide lead perovskite and organic
photovoltaics