Structural modulation and assembling of metal halide perovskites for solar cells and light‐emitting diodes

Abstract

Metal halide perovskites possess appealing optoelectronic properties and have been widely applied for solar energy harvesting and light emitting. Although perovskite solar cells (PeSCs) and perovskite light-emitting diodes (PeLEDs) have been developed rapidly in recent years, there are still no universal rules for the selection of perovskites to achieve high-performance optoelectronic devices. In this review, the working mechanisms of PeSCs and PeLEDs are first demonstrated with the discussion on the factors which determine the device performance. We then examine the optoelectronic properties of perovskites with structures modulated from 3D, 2D, 1D to 0D, and analyze the corresponding structure-property relationships in terms of photo-electric and electric-photo conversion processes. Based on the unique optoelectronic properties of structurally modulated perovskites, we put forward the concept of structural assembling engineering that integrate the merits of different types of perovskites within one matrix and elaborate their excellent properties for applications of both PeSCs and PeLEDs. Finally, we discuss the potential challenges and provide our perspectives on the structural assembling engineering of perovskites for future optoelectronic applications.

A shape memory scaffold for body temperature self‐repairing wearable perovskite solar cells with efficiency exceeding 21%

“…The correlation between J sc and light intensity can be indicated by J sc I α (where I represents the light intensity and α represents the exponential factor), and the α values of PSCs with and without SMPU are 0.970 and 0.947, respectively. The exponent α value with SMPU closer to 1 indicates that the reduction in bimolecular recombination 50 …”

“…The exponent α value with SMPU closer to 1 indicates that the reduction in bimolecular recombination. 50 To further verify the performance of the flexible device, the mechanical recovery properties and bending stability of the device are investigated. Figure 5A shows that the SMPU-added perovskite film has micron-level cracks after bending.…”

Near‐infrared emitting metal halide materials: Luminescence design and applications

“…[45][46][47][48] Once excitons are photogenerated, they will promptly undergo selftrapping to the STE levels, following return back to the ground state through emitting photons. 40,49 As the intense coupling interaction between excitons and structure lattice leads to the excited-state structural deformation, STEs are regarded as excited-state defects, which exist only upon photoexcitation. 42,50 STE emission dominates in low-dimensional (2D, 1D, 0D) LMHs, which typically featuring in large Stoke shifts with broadband emission.…”

Boosting CsSnI3‐based near‐infrared perovskite light‐emitting diodes performance via solvent coordination engineering

“…Moreover, to address the challenge of rapid crystallization in tin-based perovskites, researchers have employed techniques such as incorporating Lewis basic molecules, solvent engineering, and precise spin-coating technology. [28][29][30] Deng et al 31 incorporated polyvinyl alcohol (PVA) molecules into FASnI 3 perovskite precursors, establishing hydrogen bond interactions with I À ions, which effectively retards the crystallization of perovskite and facilitates uniform film formation. Liu et al 32 added polyvinyl-vinyl acetate (EVA) to the antisolvent, which interacts with SnI 2 to form Lewis acid-base complexes during nucleation.…”