Scalable processing for realizing 21.7%-efficient all-perovskite tandem solar modules

Journal article

Challenges in fabricating all-perovskite tandem solar cells as modules rather than as single-junction configurations include growing high-quality wide-bandgap perovskites and mitigating irreversible degradation caused by halide and metal interdiffusion at the interconnecting contacts. We demonstrate efficient all-perovskite tandem solar modules using scalable fabrication techniques. By systematically tuning the cesium ratio of a methylammonium-free 1.8–electron volt mixed-halide perovskite, we improve the homogeneity of crystallization for blade-coated films over large areas. An electrically conductive conformal “diffusion barrier” is introduced between interconnecting subcells to improve the power conversion efficiency (PCE) and stability of all-perovskite tandem solar modules. Our tandem modules achieve a certified PCE of 21.7% with an aperture area of 20 square centimeters and retain 75% of their initial efficiency after 500 hours of continuous operation under simulated 1-sun illumination.

Authors: Xiao, K; Lin, Y-H; Zhang, M; Oliver, RDJ; Wang, X

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: American Association for the Advancement of Science
• Journal: Science
• Volume: 376
• Issue: 6594
• Pages: 762-767
• Publication date: 2022-05-12
• Acceptance date: 2022-04-05
• DOI: 10.1126/science.abn7696
• EISSN: 1095-9203
• ISSN: 0036-8075
• Pmid: 35549402
• Language: English
• Keywords: FFR