Highly stable perovskite solar cells with 0.30 voltage deficit enabled by a multi-functional asynchronous...

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Perovskite solar cells (PSCs) face commercialization hurdles due to the inherent instability of halide perovskite materials, particularly their sensitivity to moisture and physical fragility.
• Developing robust encapsulation or intrinsic material stabilization strategies is crucial for advancing PSC technology.

Purpose of the Study:

• To address the stability and efficiency limitations of PSCs by proposing a novel asynchronous cross-linking strategy.
• To enhance the operational longevity and thermal endurance of perovskite solar cells through improved material properties.

Main Methods:

• Pre-embedding divinyl sulfone (DVS) as a cross-linking initiator and co-solvent into perovskite precursor solutions to control crystallization.
• Post-treating DVS-embedded perovskite films with glycerinum to induce a 3D co-polymerization network.
• Characterizing the structural, optical, and electrical properties of the modified perovskite films and devices.

Main Results:

• The cross-linking scaffold significantly improved water resistance, reduced tensile strain, and passivated deep-level defects in perovskite films.
• Achieved a certified power conversion efficiency of 24.6% (maximum >25%) with a high open-circuit voltage (V_OC) of 1.229 V, nearing the theoretical limit.
• Demonstrated the general applicability of the strategy, with efficiencies approaching 26%, and significantly enhanced operational longevity and thermal stability.

Conclusions:

• The asynchronous cross-linking strategy effectively enhances the intrinsic stability and performance of perovskite solar cells.
• This approach offers a promising pathway for the commercialization of high-efficiency and durable perovskite photovoltaic technology.
• The developed method provides a robust solution to overcome the key challenges hindering PSC market adoption.