Publication date: 3rd June 2020
Organic – inorganic metal halide hybrid perovskites are one of the most promising candidates for the fabrication of light emitting diodes (LED) because of their superior optoelectronics properties such as tunable optical bandgaps, high quantum efficiency of fluorescence, large absorption coefficients, solution processability and reliable color purity. However, the inherent instability, low exciton binding energy and trap assisted non radiative recombination’s in these three-dimensional (3D) perovskite pose challenges for their operational stability and commercial development.
As an alternative, quasi-two-dimensional (2D) perovskites, also popularly known as Ruddlesdon-Popper layered perovskites have recently emerged as a promising candidate for next generation LED’s active layer material due to their strong exciton binding energy, multiple quantum well structure-based energy funneling and better film morphology. However, the coexistence of multiple phases and increased defect states on organic – inorganic interfaces and grain boundaries limits the electro-luminescence (EL) efficiency of these LEDs. Optimal phase engineering and surface passivation are the strategies that can be adopted to improve the device efficiency effectively.
Here, we report, a systematic facile surface treatment strategy for the comparative analysis of the effects of two different passivation layers namely organic small molecule Tri phenyl phosphine oxide (TPPO) and the organic polymer PMMA on the perovskite thin films. The Quasi 2D perovskite films bearing butylamine based organic spacer have been fabricated by hot casting method and characterized by XRD, FESEM, UV-vis absorption and photoluminescence (PL) spectroscopy. A significant enhancement of PL emission is observed in TOPO and PMMA passivated 2D films which can be attributed to the reduction of non-radiative decay channel due to suppression of surface defect states. The mechanism of PL quantum efficiency enhancement and the interaction between layered perovskite and passivating agents are probed by FTIR spectroscopy and XPS study. Our study opens up a new strategy for the development of high efficiency and stable 2D perovskite LEDs.
I, Yukta acknowledge Department of Science and Technology for the INSPIRE fellowship (IF170678) and IIT Roorkee for providing research facilities. Professor Soumitra Satapathi also like to acknowledge DST SERI TMD 047 for the financial aid.
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