Non-Metallic Back Contacts for Indoor Perovskite Solar Cells: Material Criteria, Recent Progress, and Future Outlook

Area of Science:

• Materials Science
• Renewable Energy
• Device Physics

Background:

• Perovskite solar cells (PSCs) are promising for indoor photovoltaics due to high efficiency and tunable bandgaps.
• Current research on PSCs often overlooks the critical role of back contacts (BCs), especially non-metallic options.
• Metallic electrodes are historically prioritized, neglecting cost-effective, stable, and flexible non-metallic alternatives for indoor applications.

Purpose of the Study:

• To provide a comprehensive analysis of back contact materials in indoor PSCs.
• To focus on the under-explored area of non-metallic back contacts, including carbon-based and transparent conductive electrodes.
• To identify challenges and propose strategies for advancing indoor PSC technology.

Main Methods:

• Literature review and analysis of existing research on indoor PSCs and back contact materials.
• Examination of non-metallic back contact options, such as carbon-based and transparent conductive electrodes.
• Discussion of challenges including performance, scalability, flexibility, and durability.

Main Results:

• Non-metallic back contacts are critical for charge collection, device stability, and performance under indoor illumination.
• Significant research gaps exist regarding the optimization and application of non-metallic BCs in indoor PSCs.
• Interface engineering, low-temperature processing, and material innovation are key strategies for improvement.

Conclusions:

• Non-metallic back contacts are essential for developing efficient, stable, and scalable indoor PSCs.
• Addressing challenges in performance, processability, and durability is crucial for practical applications.
• This review provides insights for advancing self-powered electronics and IoT devices using indoor PSCs.