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Based on the reported ion migration under electric field in hybrid leadhalide perovskites we have developed a bright, light emitting electrochemicalcell with CH3NH3PbBr3 single crystals directly grown on vertically alignedcarbon nanotube (VACNT) forests as contact electrodes. Under the appliedelectric field, charged ions in the crystal drift and accumulate in thevicinity of the electrodes, resulting in an in operando formed p-i-nheterojunction. The decreased interface energy barrier and the strong chargeinjection due to the CNT tip enhanced electric field, result in a bright greenlight emission up to 1800 cd/m2 at room temperature (average = 60 cd/m2).Beyond the light emission, this original device architecture points to thepossibility of implementing vertically aligned CNTs as electrodes inoperationally-stable perovskite-based optoelectronic devices.

Light-Emitting Electrochemical Cells of Single Crystal Hybrid Halide Perovskite with Vertically Aligned Carbon Nanotubes Contacts