Journal
ADVANCED ENERGY MATERIALS
Volume 13, Issue 32, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202301218
Keywords
all-perovskite tandem solar cells; buried interface; defect passivation; low-bandgap perovskites
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A synergistic strategy of incorporating potassium citrate (PC) into the PEDOT:PSS hole-transport layer is reported to passivate the buried interface of Sn-Pb PSCs, leading to improved stability and performance.
Easy-to-form tin vacancies at the buried interface of tin-lead perovskites hinder the performance of low-bandgap perovskite solar cells (PSCs). Here, a synergistic strategy by incorporating potassium citrate (PC) into the poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) hole-transport layer to passivate the buried interface of Sn-Pb PSCs is reported. PC neutralizes the acidity of PEDOT:PSS and stabilizes the perovskite front surface, enhancing device stability. Citrate moieties coordinate with Sn2+ on the buried perovskite surface, preventing Sn2+ oxidation and suppressing defect formation. Additionally, potassium cations incorporate into Sn-Pb perovskites, enhancing crystallinity and passivating halide defects. The combined benefits enable efficient low-bandgap Sn-Pb PSCs with a power conversion efficiency of 22.7% and a high open-circuit voltage of 0.894 V. Using this method, 26.1% efficiency for all-perovskite tandem solar cells is demonstrated. These results emphasize the significance of buried interface passivation in developing efficient and stable Sn-Pb PSCs and all-perovskite tandem solar cells.
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