Proceedings of Online seminar on properties of perovskite solar cells (CPPSC20)
Publication date: 12th March 2020
This work studies the photoluminescence of perovskite single crystal made from methylammonium lead bromide (MAPbBr3) with one side partially substituted by iodide (MAPbBrxI3-x). We show that most of the photoinduced charge carriers in MAPbBr3 side may be transferred to the MAPbBrxI3-x region, where they are emitted, meanwhile the MAPbBrxI3-x region is not degraded by moisture. This result implies that photoinduced charge carriers are able to diffuse distances that exceed the 1.5mm length of the single crystal. Very interestingly, exposure to the light excitation yielded to the insertion of bromide ions in the iodide rich side and an increase in the photoluminescence intensity, which we associated to both an improved charge injection and a decrease in non-radiative recombination. The long diffusion length of carriers in single crystal allows the development of high efficiency LEDs, sensors and solar cells. We demonstrate that perovskite the asymetric crystals configuration mimics nature photosystems I and II, and may be used in sensors that collect disperse energy efficiently or to fabricate artificial leaves for electric trees could be produced with such configuration.
Authors want to acknowledge Ministerio de Economía y Competitividad (MINECO) from Spain under projects MAT2013-47192-C3-1-R (NASCENT) and ENE2017-85087-C3 (VALPEC). Serveis Centrals d’Instrumentació Científica from UJI are acknowledged for confocal measurements
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