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Abstract:
The effect of sodium doping in NiO as a contact layer for perovskite solar cells is investigated. A combined X-ray diffraction and X-ray photoelectron spectroscopy analysis reveals that Na+ mostly segregates as NaOx/NaCl species around NiO crystallites, with the effect of reducing interface capacitance as revealed by impedance spectroscopy. Inspired by this finding, the NiO/perovskite interface in perovskite solar cells is modified via insertion of an ultrathin NaCl interlayer, which increases the NiO work-function by 0.3 eV. This leads to an increase of power conversion efficiency, approaching 18%, and open-circuit voltage due to a remarkable suppression of surface recombination, as revealed by photoluminescence analysis and light intensity-dependent electrical measurements.
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ADVANCED MATERIALS INTERFACES
ISSN: 2196-7350
Year: 2019
Issue: 17
Volume: 6
4 . 9 4 8
JCR@2019
4 . 3 0 0
JCR@2023
ESI Discipline: MATERIALS SCIENCE;
ESI HC Threshold:236
JCR Journal Grade:1
CAS Journal Grade:3
Cited Count:
WoS CC Cited Count: 45
SCOPUS Cited Count: 46
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 0
Affiliated Colleges: