Flexible and color tunable metal halide perovskite light emitting diodes using bulky organoammonium additives
Barry Rand a
a Department of Electrical Engineering, Princeton University, Department of Electrical Engineering, Princeton University, Princeton, NJ 08544, United States
Proceedings of Strain and 2D perovskites Seminar (S2DP)
Online, Spain, 2022 July 11th - 11th
Organizers: Loreta A. Muscarella and Rhiannon Kennard
Invited Speaker, Barry Rand, presentation 006
Publication date: 13th June 2022

Hybrid organic-inorganic halide perovskite materials are promising for light emitting applications. We have established a general protocol to prepare ultrathin, smooth, passivated, and pinhole free films of metal halide perovskites with various compositions, by incorporating bulky organoammonium halide additives to the stoichiometric 3D perovskite precursors. In this way, we are able to preserve the benefits of a non-excitonic material but utilize the optoelectronic and mechanical benefits of bulky organic molecules. LEDs produced in this way are capable of exceeding 17% external quantum efficiency, exhibit significantly improved stability, and are capable of being as flexible as organic electronic thin films. Finally, they allow for stabilizing mixed halide (I and Br) and mixed Pb-Sn stoichiometries such that we can tune emission from the green to near infrared.

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