Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 26, Issue 17, Pages 2950-2958Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201505215
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Funding
- HK-RGC General Research Funds (GRF) [HKUST 606511]
- HK Innovation and Technology Fund [ITS/004/14]
- RGC Areas of Excellence [AoE/P-02/12]
- Ministry of Science and Technology [2014CB643505]
- Natural Science Foundation of China [51323003, 51573057]
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NiO is a promising hole transporting material for perovskite solar cells due to its high hole mobility, good stability, easy processibility, and suitable Fermi level for hole extraction. However, the efficiency of NiO-based cells is still limited by the slow hole extraction due to the poor perovskite/NiO interface and the inadequate quality of the two solution-processed material phases. Here, large influences of a monolayer surface modification of NiO nanocrystal layers with ethanolamine molecules are demonstrated on the enhancement of hole extraction/transport and thus the photovoltaic performance. The underlying causes have been revealed by a series of studies, pointing to a favorable dipole layer formed by the molecular adsorption along with the enhanced perovskite crystallization and the improved interface contact. Comparatively, the solar cells based on a diethanolamine-modified NiO layer have achieved a rather high fill factor, indeed one of the highest among NiO-based perovskite solar cells, and high short-circuit photocurrent density (J(sc)), resulting in a power conversion efficiency of approximate to 16%, most importantly, without hysteresis.
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