Functional 2D Phases in Mixed Dimensional Perovskite Photovoltaics

Abstract

Organic‐inorganic hybrid perovskite solar cells (PSCs) with unique properties exhibit their powerful competitiveness in the photovoltaic field over the past few years. However, the challenges of stability for perovskite devices limit the commercialization and further development. The 2D/3D hybrid structures combine the superior efficiency of bulk perovskites and the superior stability of layered perovskites and gradually get hotspots of the photovoltaic field. In addition, there remains a lack of comprehensive understanding and systematic summary of the function of 2D perovskite attributed to the complex nature of 2D/3D structures. Here, the latest progress of 2D/3D hybrid structures and focus on the functionality of 2D phases in mixed structures and the underlying mechanism from the perspective of their different distributions in the perovskite layer is summarized. Then, the insight and vital factors for overall improvements in the stability of 2D/3D structures are thoroughly discussed. Finally, it is expected that this review will contribute to the present challenges and future research prospects in the photovoltaic industry.

Unraveling Interface-Driven and Loss Mechanism-Centric Phenomena in 3D/2D Halide Perovskites: Prospects for Optoelectronic Applications

“…Additionally, there is a noteworthy concept known as “microstrain”, which primarily accounts for the presence of localized regions experiencing both compressive and tensile strain. It arises due to differences in lattice mismatch and coefficient of thermal expansion (CTE) between the substrate and the layer . These microstrains in the material affect the structure at the interface and, consequently, have different impacts on the efficiency and stability of semiconductor devices.…”

“…It arises due to differences in lattice mismatch and coefficient of thermal expansion (CTE) between the substrate and the layer. 42 These microstrains in the material affect the structure at the interface and, consequently, have different impacts on the efficiency and stability of semiconductor devices. The strain between the two materials can stabilize/destabilize (phase transitions, ion migration, degradation, etc.)…”

Surface Defect Passivation by 2-(Anthracene-9-carboxamido)ethan-1-aminium Methylammonium in Lead Iodide Mixed-Dimensional Perovskites

“…However, these desirable properties have always been accompanied by suboptimal stability with regard to moisture, temperature, and illumination. , A commonly utilized strategy for improving the stability of metal halide perovskites is to convert the purely three-dimensional crystal structure into a series of two-dimensional sheets via the introduction of either simple aliphatic or aromatic ammonium/diammonium halide salts. − This increases the formation energy of the phase and, in turn, the stability of the material . In addition, the nonpolar carbon chain/aromatic system acts to repel moisture from reaching the semiconducting sheets and accelerating the degradation process …”