Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 30, Issue 45, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202005155
Keywords
bilinkable ligands; charge recombination; contact interfaces; defect passivation; perovskite solar cells
Categories
Funding
- National Key Research and Development Program of China [2017YFA0206600]
- US Office of Naval Research [N00014-17-1-2524]
- Ontario Research Fund Research Excellence Program
- Natural Sciences and Engineering Research Council (NSERC) of Canada
- China Scholarship Council [201608410244]
- National Natural Science Foundation of China [61306019]
- Natural Science Foundation of Henan Province [162300410026]
- Henan University Fund
- Netherlands Organisation for Scientific Research (NWO) [680-50-1511]
- National 1000 Young Talents award in China
- Banting Postdoctoral Fellowship Program
- [2016GGJS-019]
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Charge recombination due to interfacial defects is an important source of loss in perovskite solar cells. Here, a two-sided passivation strategy is implemented by incorporating a bilinker molecule, thiophene-based carboxylic acid (TCA), which passivates defects on both the perovskite side and the TiO(2)side of the electron-extracting heterojunction in perovskite solar cells. Density functional theory and ultrafast charge dynamics reveal a 50% reduction in charge recombination at this interface. Perovskite solar cells made using TCA-passivated heterojunctions achieve a power conversion efficiency of 21.2% compared to 19.8% for control cells. The TCA-containing cells retain 96% of initial efficiency following 50 h of UV-filtered MPP testing.
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