期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 13, 页码 11828-11836出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b13675
关键词
perovskite solar cells; tin oxide electron-transport layer; chemical bath deposition; ultraviolet photoelectron spectroscopy; organic solar cells
资金
- King Abdullah University of Science and Technology
Chemical bath deposition (CBD) of tin oxide (SnO2) thin films as an electron -transport layer (ETL) in a planar-heterojunction n i p organohalide lead perovskite and organic bulk-heterojunction (BHJ) solar cells is reported. The amorphous SnO2 (a-SnO2) films are grown from a nontoxic aqueous bath of tin chloride at a very low temperature (55 degrees C) and do not require postannealing treatment to work very effectively as an ETL in a planar-heterojunction n i p organohalide lead perovskite or organic BHJ solar cells, in lieu of the commonly used ETL materials titanium oxide (TiO2) and zinc oxide (ZnO), respectively. Ultraviolet photoelectron spectroscopy measurements on the glass/indium tin oxide (ITO)/Sn02/methylammonium (MAPbI(3))/2,2',7,7'-tetralds(N,N-di-p-methoxyphenylamine)-9,9'-spirobifluorene device stack indicate that extraction of photogenerated electrons is facilitated by a perfect alignment of the conduction bands at the Sn02/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 (E-gap,E-optical > 4 eV) and uniform substrate coverage make the a= SnO2 ETL prepared by CBD an excellent candidate for the potentially low-cost and large-scale fabrication of organohalide lead perovskite and organic photovoltaics.
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