Dimethylammonium Cation-Induced 1D/3D Heterostructure for Efficient and Stable Perovskite Solar Cells

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Perovskite solar cells (PSCs) are promising for renewable energy.
• Enhancing PSC efficiency and long-term stability remains a key research challenge.
• Mixed-dimensional perovskite engineering offers a pathway to overcome these limitations.

Purpose of the Study:

• To develop highly efficient and durable PSCs using mixed-dimensional perovskite engineering.
• To investigate the role of 1D DMAPbI3 in improving perovskite film properties.
• To assess the impact of this engineering on device performance and stability.

Main Methods:

• A two-step deposition method was employed to synthesize 1D/3D mixed-dimensional perovskite.
• DMAI was introduced as an additive to facilitate crystalline growth and form 1D DMAPbI3 at grain boundaries.
• Characterization of perovskite films and device performance evaluation were conducted.

Main Results:

• The introduction of DMAI resulted in improved perovskite film morphology and longer charge carrier lifetime.
• A significant reduction in bulk trap density was observed in the perovskite films.
• The 1D DMAPbI3 layer effectively enhanced moisture resistance, improving long-term stability.
• The fabricated PSCs achieved a power conversion efficiency (PCE) of 21.43%.
• The devices retained 85% of their initial efficiency after 1000 hours of storage under ambient conditions (~45% RH).

Conclusions:

• Mixed-dimensional perovskite engineering using DMAI is an effective strategy for enhancing PSC efficiency and durability.
• The formation of 1D DMAPbI3 at grain boundaries plays a crucial role in improving film quality and device stability.
• This approach offers a promising route for developing high-performance and long-lasting perovskite solar cells.