Publication date: 11th March 2026
Metal-halide perovskites (MHPs) have emerged as a versatile platform for optoelectronic and quantum devices, combining a tunable electronic structure, strong light–matter interaction, and compatibility with multiple fabrication routes.¹–² Among these, thermal evaporation provides exceptional control over film thickness, stoichiometry, and interfaces, enabling stress-free growth and scalable device integration.
In this talk, I will present our progress in overcoming key scalability and reproducibility challenges in perovskite solar cells (PSCs). We demonstrate a sixfold increase in deposition rate without compromising film quality or power conversion efficiency, enabling an annealing-free, high-throughput co-evaporation process.³ In parallel, the development of soft sputtering processes for transparent conductive oxides enables fully vacuum-processed solar cells with total thicknesses of only a few tens of nanometers, while retaining high performance and operational stability.4
Leveraging the nanometer-level thickness control and exceptional uniformity enabled by thermal evaporation, we further extend this approach to the realization of perovskite-based Multiple Quantum Wells (MQWs).5 These engineered heterostructures allow precise tuning of carrier confinement, excitonic coupling, and quantum interference effects, enabling modified carrier dynamics, tunable emission, and access to quantum-confined regimes not attainable in bulk perovskites. MQWs thus offer a powerful platform for tailoring band structure and realizing unconventional photonic and quantum optoelectronic functionalities.6
Overall, these results highlight how thermally evaporated perovskites can simultaneously address manufacturability challenges in photovoltaics and enable new quantum-confined optoelectronic architectures, reinforcing their potential for next-generation energy and photonic technologies.
References
1) Min, H., et al., Nature, 2021. 598, 444.; Yoo, J.J., et al., Nature, 2021. 590 587.
2) J. Li et al., Joule 2020, 4, 1035; H.A. Dewi et al., Adv. Funct. Mater. 2021, 11, 2100557; J. Li et al., Adv. Funct. Mater. 2021, 11, 2103252;
3) Dewi et al. ACS Energy Lett. 2024, 9, 4319−4322; Dewi et al, ACS Energy Materials 2025
4)L. White etc, unpublished results
5) Advanced Materials 2021, 33, 2005166; L. White et al. ACS Energy Lett. 2024, 9, 83;
6) L. White, ACS Energy Lett. 2024, 9, 4450. L. White, ACS Energy Lett. 2024, 9, 4450.
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