Strong Quantum Confinement and Fast Photoemission Activation in CH3NH3PbI3 Perovskite Nanocrystals Grown within Periodically Mesostructured Films. Issue 8 (3rd March 2017)

• Record Type: Journal Article
• Authors: Anaya, Miguel; Rubino, Andrea; Rojas, Teresa Cristina; Galisteo‐López, Juan Francisco; Calvo, Mauricio Ernesto; Míguez, Hernán
• Is Part Of: Advanced optical materials. Volume 5:Issue 8(2017:Aug.)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-03-03
• Subjects: optical properties -- optoelectronic devices -- perovskite nanocrystals -- photophysics -- quantum confinement; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.201601087
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract : In this Communication, a synthetic route is demonstrated to obtain stabilized MAPbI3 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 TiO2 and SiO2 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 MAPbI3 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. Abstract : Organic–inorganic perovskite nanocrystals are synthesized within the 3D pore lattice of mesostructured thin metal oxide films of optical quality, control over the photoemission spectrum and dynamics being attained as a result of the fine‐tuning of strong quantum confinement effects.