Parallel Planar Heterojunction Strategy Enables Sb₂ S₃ Solar Cells with Efficiency Exceeding 8 

Area of Science:

• Materials Science
• Renewable Energy
• Device Physics

Background:

• Solution-processed inorganic heterojunction solar cells offer a promising avenue for efficient, stable, and cost-effective photovoltaic energy.
• Antimony trisulfide (Sb2S3) is identified as a highly promising photovoltaic absorber material.
• Existing fabrication methods for complex heterojunction solar cells can be intricate.

Purpose of the Study:

• To develop an easily solution-processed parallel planar heterojunction (PPHJ) strategy for enhanced solar cell performance.
• To investigate the principle behind the PPHJ strategy for creating efficient multiple planar heterojunction (PHJ) solar cells.
• To achieve the highest efficiency for Sb2S3-based solar cells.

Main Methods:

• Development of a novel parallel planar heterojunction (PPHJ) fabrication strategy.
• Utilizing antimony trisulfide (Sb2S3) as the primary light-absorbing layer.
• Incorporating methylammonium lead iodide (CH3NH3PbI3) for optimized electron transport within a parallel connection.
• Employing conventional sequential deposition techniques for layer-by-layer fabrication.

Main Results:

• The PPHJ strategy successfully prepared efficient multiple planar heterojunction (PHJ) solar cells.
• The developed Sb2S3-based PPHJ solar cells achieved a record efficiency of 8.32%.
• The PPHJ device integrates Sb2S3 for absorption and CH3NH3PbI3 for electron transport, maintaining device stability.
• The PPHJ strategy simplifies fabrication compared to traditional tandem and parallel tandem systems.

Conclusions:

• The PPHJ strategy offers a facile and efficient method for fabricating high-performance inorganic solar cells.
• This approach significantly advances the efficiency of Sb2S3-based photovoltaic devices.
• The PPHJ strategy provides a stable and cost-effective alternative for next-generation solar cell technologies.