Fluorinated Interlayer Modulation of NiOx-Based Inverted Perovskite Solar Cells

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• p-type inorganic nickel oxide (NiOx) is a transparent material with tunable optoelectronic properties.
• NiOx has a work function suitable for hole extraction in inverted perovskite solar cells (PSCs).
• Surface defects in NiOx films cause interfacial recombination and energy offsets, hindering PSC performance.

Purpose of the Study:

• To investigate the use of fluorinated 3-(2,3,4,5,6-pentafluorophenyl)propan-1-aminium iodide (FPAI) to modify NiOx anode interlayers.
• To improve the electronic properties of NiOx for enhanced PSC performance.
• To address surface defects and energy offset issues in NiOx.

Main Methods:

• Modification of NiOx films with FPAI.
• Fabrication of inverted perovskite solar cells using modified NiOx.
• Characterization of NiOx film properties and PSC device performance.
• Assessment of PSC stability.

Main Results:

• FPAI modification resulted in improved perovskite crystal growth and reduced NiOx surface defects.
• The work function (W_F) of NiOx was increased, enhancing charge extraction.
• Devices with FPAI-modified NiOx showed increased open-circuit voltage (V_oc) (1.05 V vs. 1.00 V), higher short-circuit current, and larger fill factor.
• The best performing PSCs achieved a power conversion efficiency of 19.3%.
• Improved device stability was observed with the FPAI-modified NiOx layer.

Conclusions:

• FPAI is an effective modifier for NiOx anode interlayers in PSCs.
• FPAI modification enhances perovskite solar cell efficiency and stability by improving NiOx electronic properties and reducing defects.
• This approach offers a promising strategy for advancing perovskite solar cell technology.