Amorphous (lysine)₂PbI₂ layer enhanced perovskite photovoltaics

Area of Science:

• Materials Science
• Renewable Energy
• Solid-State Chemistry

Background:

• Passivation materials are vital for high-efficiency, stable photovoltaic devices.
• Current perovskite solar cell passivation often uses crystalline materials.
• Defects and decomposition limit perovskite solar cell performance.

Purpose of the Study:

• To introduce a novel amorphous passivation layer for halide perovskite solar cells.
• To investigate the effectiveness of an amorphous (lysine)2PbI2 layer in improving perovskite solar cell performance and stability.
• To explore a new passivation strategy beyond traditional crystalline materials.

Main Methods:

• Formation of an amorphous (lysine)2PbI2 layer via solid-phase reaction between PbI2 and lysine.
• Application of the amorphous layer to perovskite films, targeting surfaces and grain boundaries.
• Characterization of the passivation layer's impact on defect neutralization, lattice stress, and decomposition resistance.

Main Results:

• Achieved a certified power conversion efficiency of 25.94% (26.27% measured).
• The amorphous (lysine)2PbI2 layer effectively neutralizes surface/interface defects due to fewer dangling bonds.
• Demonstrated enhanced stability by reducing crystal lattice stress and acting as a barrier against organic component decomposition.

Conclusions:

• The amorphous (lysine)2PbI2 layer represents a promising advancement in perovskite solar cell passivation.
• This novel passivation strategy significantly boosts both efficiency and operational stability.
• The findings suggest a new direction for developing high-performance, durable perovskite photovoltaic technologies.