2D/3D Heterojunction Engineering for Hole Transport Layer-Free Carbon-Based Perovskite Solar Cells

Area of Science:

• Materials Science
• Renewable Energy
• Nanotechnology

Background:

• Hole transport layer (HTL)-free carbon-based perovskite solar cells (C-PSCs) offer low cost and high stability, crucial for commercialization.
• However, defects and energy level mismatches at the perovskite/carbon interface hinder device performance.
• 2D/3D perovskite heterojunctions are a promising strategy to address these limitations.

Purpose of the Study:

• To review the application of 2D/3D perovskite heterojunctions in HTL-free C-PSCs.
• To elucidate the role of these heterojunctions in defect passivation and energy level optimization.
• To highlight the impact on device efficiency and stability.

Main Methods:

• Literature review of studies employing 2D/3D perovskite heterojunctions in HTL-free C-PSCs.
• Analysis of reported defect passivation mechanisms.
• Evaluation of energy level alignment strategies and their effect on device performance.

Main Results:

• 2D/3D heterojunctions effectively passivate surface defects in 3D perovskite films.
• Optimized energy level alignment at the perovskite/carbon interface is achieved.
• Significant improvements in efficiency and operational stability of HTL-free C-PSCs are reported.

Conclusions:

• 2D/3D perovskite heterojunctions are vital for advancing HTL-free C-PSCs.
• Further research into heterojunction engineering can unlock the full potential of these solar cells.
• Addressing remaining challenges is key for the commercial viability of C-PSCs.