Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 8, Issue 6, Pages 1972-1980Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9tc05759e
Keywords
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Funding
- National Natural Science Foundation of China [11674252]
- Special Funds for the Development of Strategic Emerging Industries in Shenzhen [JCYJ20170818113036217]
- Science and Technology Department of Hubei Province [2019AAA020]
- Fundamental Research Funds for the Central Universities [2042019kf0317]
- Ohio Research Scholar Program
- Air Force Research Laboratory [FA9453-18-2-0037]
- China Scholarship Council (CSC) [201806270094]
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Nickel oxide (NiOx) as a hole-transporting layer (HTL) in perovskite solar cells (PSCs) has been studied extensively in recent years. However, unlike the solution-processed NiOx films, magnetron sputtered NiOx exhibits relatively low conductivity and imperfect band alignment with perovskites, severely limiting the device performance of PSCs. In this study, a synergistically combined strategy consisting of triple interface treatments - including post-annealing, O-2-plasma, and potassium chloride treatments - is employed to modulate the optoelectronic properties of the sputtered NiOx films. Through this approach, we successfully obtained NiOx films with increased carrier density and conductivity, better energy level alignment with the perovskite absorber layer, reduced interface trap density, and improved interfacial charge extraction. PSCs using this modified sputtered NiOx as the HTL deliver a highest stabilized efficiency of 18.7%. Our result offers an alternative method to manipulate sputtered NiOx thin film properties and thereby sheds light on a manufacturing pathway to perovskite solar cells featuring sputtered NiOx HTL.
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