DMSO-Assisted Control Enables Highly Efficient 2D/3D Hybrid Perovskite Solar Cells

Area of Science:

• Materials Science
• Renewable Energy
• Nanotechnology

Background:

• Perovskite solar cells (PSCs) face challenges with surface defects and stability.
• 2D/3D heterojunctions offer a promising strategy for defect passivation and stability enhancement in PSCs.
• Developing efficient methods for constructing high-quality 2D/3D heterojunctions is crucial for advancing PSC technology.

Purpose of the Study:

• To develop an effective method for simultaneously controlling 2D/3D heterojunction formation kinetics.
• To investigate the role of DMSO in facilitating 2D spacer molecule diffusion and 3D to 2D phase transition.
• To enhance the photovoltaic performance and stability of perovskite solar cells through optimized 2D/3D heterojunctions.

Main Methods:

• A DMSO-assisted method was employed to fabricate 2D/3D perovskite heterojunctions.
• The diffusion of 2D spacer cations and the phase transition from 3D to 2D perovskite were studied.
• The impact of DMSO on perovskite surface morphology and crystal growth was analyzed.

Main Results:

• The DMSO-assisted method successfully formed a high-quality, continuous 2D perovskite top layer.
• DMSO facilitated 2D spacer cation diffusion and promoted sequential secondary crystal growth.
• The optimized 2D/3D heterojunction passivated surface defects, suppressed charge recombination, and improved PSC performance.

Conclusions:

• The developed DMSO-assisted method provides a novel approach for constructing high-quality 2D/3D perovskite heterojunctions.
• The 2D/3D heterojunction significantly enhances the power conversion efficiency and fill factor of PSCs.
• This work offers a new perspective for improving the stability and performance of perovskite solar cells.