Integrating metal-halide perovskites with the industrially textured Czochralski silicon for perovskite/silicon tandem cells shows great promise for low-cost manufacturing and ideal light trapping. However, the conformal growth of high-quality perovskite film on fully textured silicon remains challenging due to the lack of effective regulation of structural evolution and residual strains.
Recently, researchers from Nanchang University, Suzhou Maxwell Technologies, The Hong Kong Polytechnic University, CNPC Tubular Goods Research Institute, Henan Normal University, Southern University of Science and Technology, Chinese Academy of Sciences, City University of Hong Kong, Yunnan University, Harbin Institute of Technology (Shenzhen) and Fudan University reported a strain regulation strategy by forming a 3D/3D perovskite heterojunction at the buried interface through a vacuum-deposition method applicable to pyramidal texture. They found that the strained heterojunction enables high-performance, fully textured perovskite/silicon tandem solar cells that achieve an efficiency of up to 31.5%.
Their work reports that this strained heterostructure promotes the preferred crystal growth, reduces interfacial defect-induced recombination, and facilitates charge extraction.
As a result, the fully textured perovskite/silicon tandem cell achieves a certified steady-state efficiency of 31.5% and retains over 95% of its initial efficiency after 800h of continuous operation.
The above experimental results were achieved on Maxwell’s full set of perovskite/HJT tandem cell R&D platforms and related equipment. Maxwell has established a 4MW perovskite/HJT tandem solar cell experimental line and conducted the all-around development in terms of tandem process, equipment and materials.
