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Surface Sulfuration of NiO Boosts the Performance of Inverted Perovskite Solar Cells
Author(s) -
Hu Chen,
Bai Yang,
Xiao Shuang,
Tao Kewen,
Ng Wai Kit,
Wong Kam Sing,
Cheung Sin Hang,
So Shu Kong,
Chen Qi,
Yang Shihe
Publication year - 2020
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.202000270
Subject(s) - non blocking i/o , perovskite (structure) , materials science , doping , energy conversion efficiency , photovoltaic system , solar cell , optoelectronics , nanotechnology , chemical engineering , chemistry , catalysis , electrical engineering , biochemistry , engineering
As one of the most promising hole‐transporting materials for perovskite solar cells (PSC), NiO is widely used in the inverted p–i–n cell structure due to its high stability, decent hole conductivity, and easy processability for hysteresis‐free cells. However, the efficiency of NiO‐based PSCs is still low, due largely to the poor perovskite/NiO interface. Herein, a sulfur‐doping strategy to modify NiO surface via ion exchange reaction by a simple and scalable chemical bath deposition technique is introduced, which greatly improves the photovoltaic (PV) performance of the derived devices. A systematic investigation is shown where sulfur doping leads to favorable interfacial energetics with a reduced V oc loss. Sulfur doping at the interface also improves the contact between NiO and perovksite and facilitates the formation of high‐quality perovskite films. Carrier dynamics studies demonstrate reduced defect states and trap‐assisted recombination with sulfur doping, which promote the PV performance of the devices. These merits contribute concurrently to low‐loss charge transfer across the perovskite/NiO interface and facilitate charge transport through the perovskite films, leading to a high champion efficiency of 20.43% of the p–i–n structure solar cell devices.