Journal
ADVANCED MATERIALS
Volume 34, Issue 10, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202106750
Keywords
ambient printed devices; crystal growth; CsPbI; (3) perovskite solar cells; defects passivation; lattice strain
Categories
Funding
- National Key Research and Development Program of China [2016YFA0202403, 2017YFA0204800]
- Key Program project of the National Natural Science Foundation of China [51933010]
- National Natural Science Foundation of China [61974085, 61974086, U1604138]
- 111 Project [B21005]
- National 1000 Talents Plan program [1110010341]
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The incorporation of a low concentration of a novel ionic liquid successfully improves the defects, energy alignment at the interface, and stability of CsPbI3 perovskite solar cells fabricated via ambient blade-coating. The cells achieve high power conversion efficiency and impressive long-term ambient stability.
All-inorganic cesium lead triiodide (CsPbI3) perovskite is well known for its unparalleled stability at high temperatures up to 500 degrees C and under oxidative chemical stresses. However, upscaling solar cells via ambient printing suffers from imperfect crystal quality and defects caused by uncontrollable crystallization. Here, the incorporation of a low concentration of novel ionic liquid is reported as being promising for managing defects in CsPbI3 films, interfacial energy alignment, and device stability of solar cells fabricated via ambient blade-coating. Both theoretical simulations and experimental measurements reveal that the ionic liquid successfully regulates the perovskite thin-film growth to decrease perovskite grain boundaries, strongly coordinates with the undercoordinated Pb2+ to passivate iodide vacancy defects, aligns the interface to decrease the energy barrier at the electron-transporting layer, and relaxes the lattice strain to promote phase stability. Consequently, ambient printed CsPbI3 solar cells with power conversion efficiency as high as 20.01% under 1 sun illumination (100 mW cm(-2)) and 37.24% under indoor light illumination (1000 lux, 365 mu W cm(-2)) are achieved; both are the highest for printed all-inorganic cells for corresponding applications. Furthermore, the bare cells show an impressive long-term ambient stability with only approximate to 5% PCE degradation after 1000 h aging under ambient conditions.
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