Publication date: 18th December 2016
We have provided a novel method to passivate perovskite layer by introducing additives through the anti-solvent deposition step. Different additives, namely, a twisted hexaazatrinaphthylene (HATNA) and a bisthiadiazolefused tetraazapentacenequinone (DCL97), were chosen to verify the method. Optoelectronic devices based on perovskite passivated such as solar cells, LEDs and waveguide light amplifiers have been investigated. We have observed a significant improvement of the performance of all three devices. Photoconversion efficiency of solar cells has been increased 25% respect the reference cell, with no additive, while current/potential hysteresis has been decreased. We have also detected an increase of EQE for LEDs in a factor 3 and the reduction of the light amplification threshold energy in a factor of 2 to 4 when organic additives are introduced. Systematic characterization points the main role of additives is to passivate the grain boundaries and/or perovskite interface with organic additives, thus producing a reduction of non-radiative recombination that leads to a notable increase of the main figures of merit of perovskite optoelectronic devices.
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