About

The Instituto de Ciencia de Materiales de Madrid (ICMM) is an institute of the Consejo Superior de Investigaciones Cientificas (CSIC) (Spanish National Research Council) founded in December 1986, that belongs to the Area of Science and Technology of Materials, one of the eight Areas in which the CSIC divides its research activities.

 

Our mission is to create new fundamental and applied knowledge in materials of high technological impact, their processing and their transfer to the productive sectors at local, national and European scales (the true value of materials is in their use), the training of new professionals, and the dissemination of the scientific knowledge.

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Forthcoming Events

JAN19/12:00

ADVANCES IN MAGNETIC FORCE MICROSCOPY IMAGING: FROM PERMANENT MAGNETS TO BACTERIA
Miriam Jaafar  read more

JAN23/12:00

Semiconductor nanowire photonics
Carsten Ronning  read more

JAN26/12:00

Computational modeling of materials for heterogeneous catalysis:
The example of cerium oxide based catalysts

Verónica Ganduglia-Pirovano  read more

News

Reportaje en en el periódico El Mundo acerca de "La máquina española que fabrica polvo de estrella"

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14ª edición de Fotciencia. Fotografía seleccionada en la modalidad Micro a cargo de Luz Carime Gil del ICMM.

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Influence of the substrate on the bulk properties of hybrid lead halide perovskite films

Esteban Climent-Pascual, Bruno Clasen Hames, Jorge S. Moreno-Ramírez, Angel Luis Álvarez, Emilio J. Juarez-Perez, Elena Mas-Marza, Ivan Mora-Seró, Alicia de Andrés and Carmen Coya

In addition to the known effect of the substrate on the interfacial properties of perovskite films, here we show that the bulk properties of hybrid lead halide perovskite films depend on the type of substrate used for film growth. Despite the relative large film thickness, ∼600 nm, the roughness and nature of the substrate layer (glass, FTO, TiO2 and PEDOT:PSS) affect not just the degree of preferential orientation and crystal grain size but also the lattice parameters of CH3NH3PbI3 films synthesized from the PbCl2 precursor. The obtained changes in lattice parameters indicate that the Pb–Pb distance varies by around 0.7%. We suggest that the substrate roughness and chemical nature determine the concentration of defects mainly by varying the chlorine content and probably by the incorporation of oxygen and iodine vacancies during film nucleation and growth. These differences also have consequences in the observed light induced transformations. Upon laser illumination, the formation of additional defects, most probably related to oxygen, is revealed by 110 and 165 cm−1 Raman peaks. With increasing laser power the chemical transformation into PbOx is clearly identified by the 140 and 275 cm−1 Raman peaks. The irreversible photoluminescence enhancement observed at low power with illumination time, also dependent on the substrate nature, is proposed to be due to the localization of the electron–hole excitons created in the vicinity of the light generated defects. These results shed light on the performance of the perovskite layer and help to understand how bulk processes, where ion migration is a conspicuous example, are severely affected by interfacial properties such as those imposed by the substrate.

J. Mater. Chem. A

(a) Variation of the crystallite size for MAPbI3:Cl on glass, glass/FTO, glass/FTO/TiO2, glass/FTO/PEDOT:PSS and MAPbI3 powder, for crystals in the h110i direction (red circles) and the average value for the other directions (green stars), (b) pseudocubic lattice parameters (apc and cpc) of MAPbI3:Cl for this series, (c) substrate roughness dependence of the pseudocubic lattice parameter apc, (d) of the crystal size for (110) grains and (e) of preferred orientation.

Publications Highlights

ICMM-2017 - Sor Juana Inés de la Cruz, 3, Cantoblanco, 28049 Madrid, Spain. Tel: +34 91 334 9000. Fax: +34 91 372 0623. info@icmm.csic.es