Electrically driven quantum dot-micropillar single photon source with 34% overall efficiency

We report on triggered single photon emission from low mode volume electrically driven quantum dot-micropillar cavities at repetition rates of up to 220 MHz. Due to an optimized layout of the doped planar microcavity and an advanced lateral current injection scheme, highly efficient single photon sources are realized. While g((2))(0)-values as low as 0.13 +/- 0.05 and a Purcell factor of 4 are observed for a 2.0 mu m diameter micropillar, single photon emission at a rate of (35 +/- 7) MHz and an overall efficiency of (34 +/- 7)% are demonstrated for a 3.0 mu m device.