期刊
ADVANCED ENERGY MATERIALS
卷 9, 期 12, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201803450
关键词
defects; in situ; mitigation; stability; surfaces; thermal cycle
类别
资金
- national project BEYOND NANO Upgrade - regione Sicilia [CUP G66J17000350007]
- PERSEO-PERovskite-based Solar cells: toward high efficiency and long-term stability (Bando PRIN 2015-Italian Ministry of University and Scientific Research (MIUR)) [2488, 20155LECAJ]
- Regione Puglia [LSBC6N4, GOWMB21]
- Agenzia Regionale per la Tecnologia e l'Innovazione (ARTI) [LSBC6N4, GOWMB21]
On the basis of experiment and theory, a general paradigm is drawn that reconsiders N-2 not simply being an inert species but rather an effective healing gas molecule if entering a methylammonium lead iodide (MAPbl(3)) layer. Nitrogen is soaked into polycrystalline MAPbl(3) via a postdeposition mild thermal treatment under slightly overpressure conditions to promote its diffusion across the whole layer. A significant reduction of radiative recombination and a concurrent increase of light absorption, with a maximum benefit at 80 degrees C, are observed. Concomitantly, the current of holes drawn from the surfaces with nanometer resolution through a biased tip is raised by a factor of 3 under N-2. This is framed by a reduction of the barrier for carrier extraction. The achieved improvements are linked to a nitrogen-assisted recovery of intrinsic lattice disorder at the grain shells along with a simultaneous stabilization of undercoordinated Pb2+ and MA(+) cations through weak electrostatic interactions. Defect mitigation under N(2 )is reinforced in comparison to the benchmark behavior under argon. It is additionally unveiled that surface stabilization through N-2 is morphology-independent and thus can be applied after any preparation procedure. Such simple and low-cost strategy can complement other stabilizing solutions for perovskite solar cells or light-emitting diode engineering.
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