The INAM designs an optical switch with perovskite that will improve the efficiency of solar cells and LEDs



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## The INAM designs an optical switch with perovskite that will improve the efficiency of solar cells and LEDs The study published in Nature Communications will have repercussions for the use of the new low-cost mineral in new devices for the storage of information and for optical applications

16/05/2019 |
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The study published in Nature Communications will have repercussions for the use of the new low-cost mineral in new devices for the storage of information and for optical applications.

A research led by the University Institute of Advanced Materials (INAM) of the Universitat Jaume I (UJI) has designed an optical switch with perovskite that can improve the efficiency and stability of solar cells and LEDs made of this mineral that implies a lower cost of these devices. The results of this study, led by Professor Juan Bisquert, have been published in the journal *Nature Communications*.

This optical switch is based on perovskite materials, which combine four properties rarely found in the same mineral: electrical conductivity, ionic conductivity and excellent light absorption and emission. The arrangement of these properties allows access to new concepts of electronic devices such as memory for light emission.

The optical switch studied at INAM is an example of possible new concepts. "This switch composed of perovskite and two electrical contacts initially emits light when an electric current is passed through it. This promotes ionic motion and these ions change the structure of the material generating a state in which the switch is off", explains Physics Department researcher Antonio Guerrero. This mechanism, which is also relevant for understanding the degradation of perovskite, will allow a better understanding of how solar cells and perovskite LEDs work, as well as the preparation of new optical memory devices.

**MORE STABLE DEVICES**

Juan Bisquert, Professor of Applied Physics at the UJI, also director of the INAM, comments that this work has succeeded in correlating the electrical current and the time it takes to turn off the switch with the speed of the movement of ions, a fundamental property of the material that will help prepare solar cells and more stable LEDs. "If the shutdown is slower, it will be better, as it will indicate that the device will degrade less and be more stable, which may result in more efficient solar cells and LEDs", says Guerrero.

The new types of materials have already been widely used to create clean energy devices. Solar cells based on low-cost compounds such as perovskite and other organic compounds are one of the main lines of research of the University Institute of Advanced Materials at the Universitat Jaume I. This work is part of a collaboration with the German group of the University of Bayreuth specialized in optical measurements.

Recently, the INAM became the first UJI centre to be recognised as a Scientific Unit for Business Innovation by the Valencian regional government [Generalitat Valenciana]. The Valencian Innovation Agency (AVI) designated INAM's scientific activity for its vocation to develop research that can be applied to the productive sector, and to meet the needs detected by technological institutes and the business fabric. In addition, the INAM studies the production of fuels from sunlight, breaking water molecules and producing hydrogen and other catalytic materials, in the most chemical aspect, all of great importance in the context of international research.

Link to the paper: https://www.nature.com/articles/s41467-018-07571-6

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