Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
Publication date: 20th April 2022
The addition of low concentrations of additives for passivating the surface defects of 3D hybrid perovskite grains has achieved notable improvements in the performance of light emitting devices based on these materials.1 Playing with the length and type of polymer added to the perovskite film allows one to control the morphology and optoelectronic properties of the materials.2 However, the incorporation of high densities of polymer into the perovskite film has not been studied, partially due to the potential electrical insulating character of the polymers.
In this talk, we will describe the effect of the addition of several concentrations of a cellulose polymer on: a) the morphology of thin films of 2D hybrid perovskites, b) the changes in the optoelectronic properties of the 2D material and c) the influence on the performance and stability of the fabricated light-emitting devices based on the 2D perovskites.
At high concentration of the polymer, 50-75 mg/ml, the size of the perovskite grains is reduced to a nanometer scale but maintaining the good homogeneity of the films. The photoluminescence signal from the films containing cellulose appears to be increased near 20 times, which is explained due to the confinement effect of the small crystalline domains. On the opposite, a large increase on the trap states is observed due to the greater number of surface defects. The fabricated light-emitting devices display an enhanced stability due to the presence of the polymer mixed with the 2D hybrid perovskite but without affecting to the performance of the devices.
This work was financially supported by the Ministerio de Ciencia e Innovación of Spain, through PID2020-119209RB-I00 project, as well as by the Andalusian Government, through P20_01151 projects, all cofinanced with FEDER funds.
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