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Strong Quantum Confinement and Fast Photoemission Activation in CH 3 NH 3 PbI 3 Perovskite Nanocrystals Grown within Periodically Mesostructured Films
Author(s) -
Anaya Miguel,
Rubino Andrea,
Rojas Teresa Cristina,
GalisteoLópez Juan Francisco,
Calvo Mauricio Ernesto,
Míguez Hernán
Publication year - 2017
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201601087
Subject(s) - materials science , nanocrystal , quantum dot , perovskite (structure) , crystallite , luminescence , oxide , thin film , nanotechnology , annealing (glass) , chemical physics , analytical chemistry (journal) , chemical engineering , optoelectronics , chemistry , physics , chromatography , engineering , metallurgy , composite material
In this Communication, a synthetic route is demonstrated to obtain stabilized MAPbI 3 nanocrystals embedded in thin metal oxide films that display well‐defined and adjustable quantum confinement effects over a wide range of 0.34 eV. Mesostructured TiO 2 and SiO 2 films displaying an ordered 3D pore network are prepared by evaporation‐induced self‐assembly of a series of organic supramolecular templates in the presence of metal oxide precursors. The pores in the inorganic films obtained after thermal annealing are then used as nanoreactors to synthesize MAPbI 3 crystallites with narrow size distribution and average radius comprised between 1 and 4 nm, depending on the template of choice. Both the static and dynamic photoemission properties of the ensemble display features distinctive of the regime of strong quantum confinement. Photoemission maps demonstrate that the spectral and intensity properties of the luminescence extracted from the perovskite quantum dot loaded films are homogeneous over squared centimeters areas. At variance with their bulk counterparts, constant emission intensity is reached in time scales at least four orders of magnitude shorter.