Precisely positioned generation of CsPbBr3 nano-light sources in a Cs4PbBr6 film by electron beam irradiation

Tomoyasu Fujimaru; Kanta Hirai; Masato Inamata; Hiromu Tanaka; Midori Ikeuchi; Hidehiro Yamashita; Mitsutaka Haruta; Takehiko Tamaoka; Naohiko Kawasaki; Hikaru Saito

arXiv · 2601.14898

Precisely positioned generation of CsPbBr3 nano-light sources in a Cs4PbBr6 film by electron beam irradiation

Tomoyasu Fujimaru·Kanta Hirai·Masato Inamata·Hiromu Tanaka·Midori Ikeuchi·Hidehiro Yamashita·Mitsutaka Haruta·Takehiko Tamaoka·Naohiko Kawasaki·Hikaru Saito

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Abstract

Integration of high-quality photon emitters at specific locations within nanophotonic structures or optoelectronic devices is a key to innovating on-chip optical control and quantum technologies. Halide perovskite nanoparticles have great potential as single photon emitters with high quantum efficiency. To achieve their full potential, they must be embedded in a host material that ensures chemical stability and passivates surface defects. A previous experiment on a CsPbBr3-Cs4PbBr6 nanocomposite film suggested possibility that electron beam irradiation can be used to control positions of CsPbBr3 nano-light sources in the Cs4PbBr6 host although the effects of electron beam irradiation are not fully understood. Here, we fabricate a Cs4PbBr6-CsBr film, not containing the CsPbBr3 phase, and provide direct evidence that CsPbBr3 nanoparticles can be locally generated in the Cs4PbBr6 host by irradiation with a focused electron beam. We further demonstrate perovskite nano-light source arrays with submicron spacing using this method.

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Tomoyasu Fujimaru, Kanta Hirai, Masato Inamata, Hiromu Tanaka, Midori Ikeuchi, Hidehiro Yamashita, Mitsutaka Haruta, Takehiko Tamaoka, Naohiko Kawasaki, Hikaru Saito. 2026-01-21. Precisely positioned generation of CsPbBr3 nano-light sources in a Cs4PbBr6 film by electron beam irradiation. https://arxiv.org/abs/2601.14898

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