Multifunctional guanidine additive enabling high-quality phase transition crystallization of 1.67 eV-bandgap perovskite for efficient and stable perovskite/Si tandem solar cells

Perovskite/silicon tandem solar cells (PSTSCs) integrate the mature processing technology of silicon with the low-cost solution processability of perovskites, exhibiting unparalleled development potential. However, non-uniform crystallization and significant non-radiative recombination...