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Hole blocking PbI 2 /CH 3 NH 3 PbI 3 interface
Author(s) -
Somsongkul Voranuch,
Lang Felix,
Jeong Ah Reum,
Rusu Marin,
Arunchaiya Marisa,
Dittrich Thomas
Publication year - 2014
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201409292
Subject(s) - perovskite (structure) , electron transfer , oxide , materials science , surface photovoltage , absorption spectroscopy , absorption (acoustics) , metal , analytical chemistry (journal) , spectroscopy , electron , transition metal , chemistry , photochemistry , crystallography , catalysis , optics , physics , chromatography , quantum mechanics , metallurgy , composite material , biochemistry
Modulated charge separation across (MO)/CH 3 NH 3 PbI 3 and (MO)/PbI 2 /CH 3 NH 3 PbI 3 (MO = TiO 2 , MoO 3 ) interfaces was investigated by surface photovoltage (SPV) spectroscopy. Perovskite layers were deposited by solution‐based one‐step preparation and two‐step preparation methods. An unreacted PbI 2 layer remained at the interface between the metal oxide and CH 3 NH 3 PbI 3 for two‐step preparation. For the two‐step preparation on TiO 2 , the SPV signal related to absorption in CH 3 NH 3 PbI 3 increased in comparison to the one‐step preparation due to electron transfer from CH 3 NH 3 PbI 3 via PbI 2 into TiO 2 whereas the SPV signal related to defect transitions decreased. For the one‐step preparation on MoO 3 , holes photogenerated in CH 3 NH 3 PbI 3 recombined with electrons in MoO 3 . In contrast, a hole transfer from CH 3 NH 3 PbI 3 towards MoO 3 was blocked by the PbI 2 interlayer for the two‐step preparation on MoO 3 . (© 2014 WILEY‐VCH Verlag GmbH &Co. KGaA, Weinheim)