This paper presents a novel approach to generating near-unity indistinguishable single photons in the solid-state using semiconductor quantum dots (QDs) embedded in electrically controlled cavity structures. The authors demonstrate on-demand, bright, and ultra-pure single-photon generation, achieving an indistinguishability of 0.9956±0.0045 and a $g^{(2)}(0)$=0.0028±0.0012. The device, fabricated from a planar λ cavity embedding an InGaAs QD layer, is optimized for high extraction efficiency and controlled charge environment. Under resonant excitation, the source exhibits a brightness of 0.154±0.015, making it 20 times brighter than any source of equal quality. This technology opens new possibilities for optical quantum manipulation, particularly in applications requiring high-purity, highly-indistinguishable single photons, such as fault-tolerant linear optical quantum computation. The deterministic fabrication process and high brightness make these sources highly scalable and suitable for advanced quantum technologies.This paper presents a novel approach to generating near-unity indistinguishable single photons in the solid-state using semiconductor quantum dots (QDs) embedded in electrically controlled cavity structures. The authors demonstrate on-demand, bright, and ultra-pure single-photon generation, achieving an indistinguishability of 0.9956±0.0045 and a $g^{(2)}(0)$=0.0028±0.0012. The device, fabricated from a planar λ cavity embedding an InGaAs QD layer, is optimized for high extraction efficiency and controlled charge environment. Under resonant excitation, the source exhibits a brightness of 0.154±0.015, making it 20 times brighter than any source of equal quality. This technology opens new possibilities for optical quantum manipulation, particularly in applications requiring high-purity, highly-indistinguishable single photons, such as fault-tolerant linear optical quantum computation. The deterministic fabrication process and high brightness make these sources highly scalable and suitable for advanced quantum technologies.