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1. Formation of Stable Metal Halide Perovskite/Perovskite Heterojunctions

   https://doi.org/10.1021/acsenergylett.0c01609  

   Clark, Catherine P.; Mann, Jennifer E.; Bangsund, John S.; Hsu, Wan-Ju; Aydil, Eray S.; Holmes, Russell J. (November 2020, ACS Energy Letters)
2. Two-Dimensional Halide Pb-Perovskite–Double Perovskite Epitaxial Heterostructures

   https://doi.org/10.1021/jacs.3c06127  

   Singh, Ajeet; Yuan, Biao; Rahman, Md. Habibur; Yang, Hanjun; De, Angana; Park, Jee Yung; Zhang, Shuchen; Huang, Libai; Mannodi-Kanakkithodi, Arun; Pennycook, Timothy J.; et al (September 2023, Journal of the American Chemical Society)
3. Double Perovskite Interlayer Stabilized Highly Efficient Perovskite Solar Cells

   https://doi.org/10.1021/acsami.4c10378  

   Xiang, Wenjun; Cronk, Ethan; Wall, Jacob; Li, Lin; Zhu, Kai; Berry, Joseph J; Lad, Robert J; Yu, Liping; Yan, Feng (August 2024, ACS Applied Materials & Interfaces)
4. Perovskite‐Derivative Valleytronics

   https://doi.org/10.1002/adma.202004111  

   Liang, Jia; Fang, Qiyi; Wang, Hua; Xu, Rui; Jia, Shuai; Guan, Yuxuan; Ai, Qing; Gao, Guanhui; Guo, Hua; Shen, Kaijun; et al (October 2020, Advanced Materials)

   Abstract Halide perovskites are revolutionizing the renewable energy sector owing to their high photovoltaic efficiency, low manufacturing cost, and flexibility. Their remarkable mobility and long carrier lifetime are also valuable for information technology, but fundamental challenges like poor stability under an electric field prevent realistic applications of halide perovskites in electronics. Here, it is discovered that valleytronics is a promising route to leverage the advantages of halide perovskites and derivatives for information storage and processing. The synthesized all‐inorganic lead‐free perovskite derivative, Cs₃Bi₂I₉, exhibits strong light–matter interaction and parity‐dependent optically addressable valley degree of freedom. Robust optical helicity in all odd‐layer‐number crystals with inversion symmetry breaking is observed, indicating excitonic coherence extending well beyond 11 layers. The excellent optical and valley properties of Cs₃Bi₂I₉arise from the unique parallel bands, according to first principles calculations. This discovery points to new materials design principles for scalable valleytronic devices and demonstrates the promise of perovskite derivatives beyond energy applications. 

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5. Two-dimensional perovskite templates for durable, efficient formamidinium perovskite solar cells

   https://doi.org/10.1126/science.abq6993  

   Sidhik, Siraj; Metcalf, Isaac; Li, Wenbin; Kodalle, Tim; Dolan, Connor J; Khalili, Mohammad; Hou, Jin; Mandani, Faiz; Torma, Andrew; Zhang, Hao; et al (June 2024, Science)

   We present a design strategy for fabricating ultrastable phase-pure films of formamidinium lead iodide (FAPbI₃) by lattice templating using specific two-dimensional (2D) perovskites with FA as the cage cation. When a pure FAPbI₃precursor solution is brought in contact with the 2D perovskite, the black phase forms preferentially at 100°C, much lower than the standard FAPbI₃annealing temperature of 150°C. X-ray diffraction and optical spectroscopy suggest that the resulting FAPbI₃film compresses slightly to acquire the (011) interplanar distances of the 2D perovskite seed. The 2D-templated bulk FAPbI₃films exhibited an efficiency of 24.1% in a p-i-n architecture with 0.5–square centimeter active area and an exceptional durability, retaining 97% of their initial efficiency after 1000 hours under 85°C and maximum power point tracking. 

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