Abstract
Abstract Low-dimensional metal halide perovskites have emerged as promising alternatives to the traditional three-dimensional (3D) components, due to their greater structural tunability and environmental stability. Dion-Jacobson (DJ) phase two-dimensional (2D) perovskites, which are formed by incorporating bulky organic diammonium cations into inorganic frameworks that comprises a symmetrically layered array, have recently attracted increasing research interest. The structure-property characteristics of DJ phase perovskites endow them with a unique combination of photovoltaic efficiency and stability, which has led to their impressive employment in perovskite solar cells (PSCs). Here, we review the achievements that have been made to date in the exploitation of DJ phase perovskites in photovoltaic applications. We summarize the various ligand designs, optimization strategies and applications of DJ phase PSCs, and examine the current understanding of the mechanisms underlying their functional behavior. Finally, we discuss the remaining bottlenecks and future outlook for these promising materials, and possible development directions of further commercial processes.
Highlights
Metal halide perovskites have attracted tremendous attention due to their excellent optoelectronic properties, which include long carrier-diffusion lengths, high absorption coefficients, high defect tolerances, tunable bandgaps and a capacity for ambipolar charge transport [1,2,3,4,5]
The structureproperty characteristics of DJ phase perovskites endow them with a unique combination of photovoltaic efficiency and stability, which has led to their impressive employment in perovskite solar cells (PSCs)
Miyasaka et al first reported the utility of metal halide perovskites in photovoltaic applications in 2009, with a device that exhibited an efficiency of 3.8% [6], and in the subsequent decade the certified efficiency of perovskite solar cells (PSCs) has rapidly increased to as high as 25.5% [7]
Summary
Metal halide perovskites have attracted tremendous attention due to their excellent optoelectronic properties, which include long carrier-diffusion lengths, high absorption coefficients, high defect tolerances, tunable bandgaps and a capacity for ambipolar charge transport [1,2,3,4,5]. The main challenge of DJ phase or whole 2D perovskites is the current efficiency bottleneck, which lags far behind those of their 3D analogs This suboptimal optoelectronic behavior of DJ phase 2D perovskites is due to a common problem in the development of low-dimensional perovskites: the increased quantum and dielectric confinement that occurs when crystal dimensions are decreased. Advancements in the preparation of key materials will facilitate self-assembly processes and the regulation of crystallization kinetics, and enable precise control of crystal orientations and phase compositions This will motivate the development of high-performance DJ phase PSCs that exhibit good efficiency, reproducibility, stability. We highlight different ligand designs, optimization strategies and advanced applications, and the mechanisms underlying these, that represent progress toward efficient and stable DJ phase PSCs. the remaining challenges and future outlook for these promising photovoltaic materials are discussed, to explore effective development directions for further commercial process
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