@article{c3fc989dbe804682aa2f2f744eac96fd,
title = "Surface Sulfuration of NiO Boosts the Performance of Inverted Perovskite Solar Cells",
abstract = "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 Voc 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.",
keywords = "interface engineering, perovskite solar cells, surface doping",
author = "Chen Hu and Yang Bai and Shuang Xiao and Kewen Tao and Ng, {Wai Kit} and Wong, {Kam Sing} and Cheung, {Sin Hang} and So, {Shu Kong} and Qi Chen and Shihe Yang",
note = "Funding Information: Chen Hu and Yang Bai contribute equally to this work. This work was supported by HKRGC General Research Funds (GRF No. 16312216), the HK Innovation and Technology Fund (GHP/079/17SZ), the Natural Science Foundation of China (21972006, 21905006, 51961165105, 51773230, and 21805010), the Shenzhen Peacock Plan (KQTD2016053015544057), the Nanshan Pilot Plan (LHTD20170001), HKRGC Areas of Excellence Scheme (AoE/P‐02/12),The Shenzhen & Hong Kong Joint Research Program (SGLH20180622092406130), and the Guangdong Science and Technology Program (2017B030314002). Funding Information: Chen Hu and Yang Bai contribute equally to this work. This work was supported by HKRGC General Research Funds (GRF No. 16312216), the HK Innovation and Technology Fund (GHP/079/17SZ), the Natural Science Foundation of China (21972006, 21905006, 51961165105, 51773230, and 21805010), the Shenzhen Peacock Plan (KQTD2016053015544057), the Nanshan Pilot Plan (LHTD20170001), HKRGC Areas of Excellence Scheme (AoE/P-02/12),The Shenzhen & Hong Kong Joint Research Program (SGLH20180622092406130), and the Guangdong Science and Technology Program (2017B030314002).",
year = "2020",
month = oct,
day = "1",
doi = "10.1002/solr.202000270",
language = "English",
volume = "4",
journal = "Solar RRL",
issn = "2367-198X",
publisher = "Wiley-VCH Verlag",
number = "10",
}