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Ligand‐Free, Highly Dispersed NiO x Nanocrystal for Efficient, Stable, Low‐Temperature Processable Perovskite Solar Cells
Author(s) -
He Jinjin,
Bi Enbing,
Tang Wentao,
Wang Yanbo,
Zhou Zhongmin,
Yang Xudong,
Chen Han,
Han Liyuan
Publication year - 2018
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.201800004
Subject(s) - non blocking i/o , materials science , perovskite (structure) , nanocrystal , ligand (biochemistry) , chemical engineering , solar cell , solvent , relative humidity , layer (electronics) , solution process , nanotechnology , optoelectronics , catalysis , organic chemistry , chemistry , biochemistry , receptor , physics , engineering , thermodynamics
Inverted configuration perovskite solar cells containing a NiO x layer fabricated by using a low‐temperature process have yielded highly efficient, flexible devices. However, the instability of these devices has limited their commercial application. Here, we report high‐quality, ligand‐free NiO x nanocrystals, prepared directly through a facile organic solvent method, that form a stable ink when dispersed in an ethanol solvent. Rigid and flexible devices containing a NiO x layer (active area, 1.02 cm 2 ) fabricated with this ink at low‐temperature achieved efficiencies of 18.49 and 15.89%, respectively. In addition, the devices retain 90% of their initial performance at 500 h in a damp‐heat test (85 °C and 85% relative humidity) due to there being less hydroxyl functional groups and H 2 O molecules on the NiO x surface, which degrade perovskite. Thus, we are able to successfully synthesize ligand‐free NiO x for the low‐temperature production of a high‐performance, stable perovskite solar cell.