Journal
ADVANCED ENERGY MATERIALS
Volume 12, Issue 1, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202102820
Keywords
1D lead-iodide; ion diffusion; nonionic cross-linked; perovskite solar cells; stability
Categories
Funding
- National Natural Science Foundation of China [21875081, 91733301, 51972251]
- Chinese National 1000-TalentPlan program
- Foundation of State Key Laboratory of Coal Conversion [J18-19-913]
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The introduction of a novel compound DPPO significantly improved the electronic quality and stability of perovskite films, leading to high-efficiency and stable solar modules.
Long-term stability has become the major obstacle for the successful large-scale application of perovskites devices. Owing to the ionic nature of metal-halide perovskites, the interfacial ion diffusion can induce irreversible degradation under operational conditions, which presents a great challenge to realize stable perovskite solar modules. Here, a diphenylphosphine oxide compound, ethane-1,2-diylbis(diphenylphosphine oxide) (DPPO) is introduced to coordinate with lead iodide and form a cross-linked 1D Pb3I6-DPPO (1D-PbI2) complex. These judiciously designed cross-linked nonionic low-dimensional lead halide/organic adducts can passivate the defects of perovskite while acting as a robust ion diffusion barrier, thus significantly improving the electronic quality and intrinsic stability of perovskite films. As a result, high-performance inverted (p-i-n) solar modules with a champion efficiency approaching 19% (a certified stabilized efficiency of 17.8%) for active device areas above 17 cm(2) without the use of antisolvents, accompanied by outstanding operational stability under heat stress and continuous illumination are achieved.
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