Publication date: 17th July 2025
Lead halide perovskite has been in the spotlight because of its unique and color-tunable optoelectronic properties. With the recent advancements through the nano-crystals dimer formation, detailing the interfacial chemistry between the soft ionic halides and covalent nanostructures has paved the era for an enhanced and stabilized heterostructure between them. As Bi(II) ions have a higher Pb(II) ion compatibility, herein, we are exploring the formation of one-dimensional epitaxial Bi2S3/ CsPbBr3 heterostructure for the first time for an enhanced charge separation and transport. The epitaxial growth was monitored by high-resolution transmission electron microscopy, and the transient absorption spectroscopy was employed to understand the hot carrier dynamics in the hetero-nucleation between them. The minimal lattice mismatch between the crystallographic planes at the dimer interface facilitated the formation of the epitaxial relationship between Bi2S3 and CsPbBr3. The enhanced absorption and charge separation lead to photo-detectors with drastically improved responsivity and specific detectivity. This study gave valuable insight for the design and assembly of epitaxial CsPbBr3 heterostructure to enhance the photovoltaic performance of photovoltaic applications.
We acknowledge financial support from the Finnish Ministry of Education and Culture through the Quantum Doctoral Education Pilot Program (QDOC, VN/3137/2024-OKM-4), and from the Research Council of Finland through the Finnish Quantum Flagship project (Project No. 358877). We also thank the Micronova Nanofabrication Centre and the Nano-microscopy Centre, both part of the OtaNano research infrastructure at Aalto University (Espoo, Finland), for providing access to instrumentation.
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