Breakthrough in Air-Processed Perovskite Solar Cell Fabrication

Researchers have developed a post-treatment additive strategy that simultaneously achieves surface passivation and regulates secondary grain growth, leading to high-performance perovskite solar cells fabricated entirely in ambient air. The work, led by Kelan Wang, Shuai Xu, Rong Cao, Xinyi Zhang, Haocong Wang, Chongzhen Tang, Ran Fansheng, Yipu Wang, Minmin Wang, and Yanqiang Hu, appears in a 2026 publication and highlights an efficient approach using an FPA-based treatment.

Understanding Perovskite Solar Cells and Air Processing Challenges

Perovskite solar cells utilize materials with a perovskite crystal structure as the light-absorbing layer. These devices have attracted attention for their potential to deliver high power conversion efficiencies at lower production costs compared to traditional silicon photovoltaics. However, conventional fabrication often requires inert atmospheres to prevent degradation from moisture and oxygen. Air-processed methods, conducted in ambient conditions, offer scalability and reduced equipment needs but introduce challenges such as defect formation at surfaces and grain boundaries, which can limit efficiency and stability.

The Role of Post-Treatment Additives in Material Enhancement

The reported strategy employs a post-treatment additive to address these issues through synergistic effects. Surface passivation involves coating or modifying the perovskite layer to reduce trap states that cause charge recombination. Secondary grain growth regulation promotes larger, more uniform grains during or after initial film formation, improving charge transport and reducing boundaries where defects accumulate. This dual action is particularly valuable for air-processed films, where environmental exposure can otherwise compromise film quality.

Key Findings from the Research Publication

The study demonstrates that the FPA-based post-treatment integrates these mechanisms effectively. Resulting devices show enhanced photovoltaic performance, with efficiencies positioned among the highest reported for air-processed perovskite solar cells. The approach maintains compatibility with ambient fabrication, supporting reproducibility and potential for larger-area applications. Detailed characterization in the work confirms improvements in film morphology, reduced defect density, and better device metrics.

Access the original publication here: https://www.sciencedirect.com/org/science/article/abs/pii/S1359734526011481. The full author list includes Kelan Wang, Shuai Xu, Rong Cao, Xinyi Zhang, Haocong Wang, Chongzhen Tang, Ran Fansheng, Yipu Wang, Minmin Wang, and Yanqiang Hu.

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Context Within Broader Perovskite Research Developments

Recent advances in air-processed perovskite solar cells have pushed efficiencies beyond 26 percent in optimized n-i-p structures, underscoring the field's rapid progress. Strategies involving additives for passivation and crystallization control appear across multiple studies, complementing efforts to enhance stability under operational conditions. The current work builds on these trends by focusing on a post-fabrication step that delivers combined benefits without requiring complex precursor modifications.

Implications for Renewable Energy and Scalable Manufacturing

Improved air-processed perovskite solar cells could accelerate the transition to affordable solar technologies. Lower barriers to production align with global goals for expanded renewable capacity. The additive method may also inform adaptations for flexible substrates or tandem device architectures, where film quality directly influences overall performance and longevity.

Perspectives from Materials Science and Photovoltaics Communities

Experts in the field emphasize the importance of defect management in achieving commercial viability. Approaches that combine passivation with morphological control address multiple loss mechanisms simultaneously, offering pathways to higher open-circuit voltages and fill factors. This publication contributes concrete evidence of such synergy in ambient conditions, providing a reference point for ongoing optimization efforts.

Future Directions and Research Opportunities

Further exploration could examine variations in additive chemistry, integration with different perovskite compositions, or scaling to module-level devices. Long-term stability testing under real-world conditions remains a priority. Academic and industry collaborations may accelerate translation of these laboratory advances into practical applications.

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Opportunities in Related Academic and Research Fields

Developments in perovskite photovoltaics intersect with materials chemistry, device engineering, and sustainable energy studies. Researchers and students interested in these areas can explore positions focused on thin-film technologies, characterization techniques, and renewable energy systems through specialized academic career resources.