Tailoring Phase Purity in the 2D/3D Perovskite Heterostructures Using Lattice Mismatch
Source abstract
Abstract
Although the fabrication of two-dimensional (2D)/three-dimensional (3D) halide perovskite heterostructures has been employed to balance the long-term stability and high efficiency of perovskite solar cells, the formation of metastable quasi-2D perovskites remains the most serious challenge. Here, we demonstrate that large lattice mismatch derived from halide and cation differences between 2D and 3D perovskites are key to avoiding the formation of unintended 2D phases in the preparation of 2D/3D bulk heterostructure because the phase transformation becomes less thermodynamically favorable. Specifically, by employing chloride 2D perovskite (PYA)2PbCl4 (PYA = propargylammonium) crystals into a 3D precursor solution, we achieve a phase-pure 2D/3D heterojunction with clean type-I band alignment, which exhibits greatly reduced charge recombination. Furthermore, the incorporation of alkyne perovskites is also shown to suppress iodine diffusion and formation due to their exceptional iodine capture capacity. The resultant 2D/3D heterostructured devices exhibited enhanced efficiencies and stabilities compared with their 3D counterparts.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Perovskite Materials and Applications · 2D Materials and Applications · Advanced Photocatalysis Techniques
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Institute of Photovoltaics/Department of Materials Science and Engineering, Nanchang University, Nanchang 330031, China
Department of Applied Physics, Research Institute for Smart Energy (RISE), The Hong Kong Polytechnic University, Kowloon HK SAR, Hong Kong China
Henan Key Laboratory of Infrared Materials & Spectrum Measures and Applications, Henan Normal University, Xinxiang 453007, China
State Key Laboratory of Integrated, Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden
Department of Materials Science & Engineering, City University of Hong Kong, Kowloon HK SAR, Hong Kong China
Funding
National Natural Science Foundation of China · Hong Kong Polytechnic University · Excellent Young Foundation of Jiangxi Province
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