Efficient and Stable Vacuum-Free-Processed Perovskite Solar Cells Enabled by a Robust Solution-Processed Hole...

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Perovskite solar cells (PSCs) offer promising photovoltaic performance.
• Efficient and stable hole transport layers (HTLs) are crucial for PSCs.
• Vacuum-free processing methods are desirable for scalable PSC manufacturing.

Purpose of the Study:

• To develop a novel, solution-processed HTL for efficient and stable vacuum-free PSCs.
• To investigate the doping mechanism and conductivity enhancement of a PEDOT:Mo(tfd-COCF3)3 film.
• To evaluate the performance and stability of PSCs utilizing the new HTL.

Main Methods:

• Solution-processing of molybdenum tris-[1-(trifluoroethanoyl)-2-(trifluoromethyl)ethane-1,2-dithiolene] (Mo(tfd-COCF3)3)-doped poly(3,4-ethylenedioxythiophene) (PEDOT) film.
• Characterization of the doped film's electronic properties, including conductivity and HOMO level.
• Fabrication and testing of planar heterojunction PSCs with the novel HTL.
• Assessment of device performance (PCE) and stability under ambient conditions.

Main Results:

• Mo(tfd-COCF3)3 doping induced p-doping in PEDOT, increasing conductivity by over three orders of magnitude.
• Planar heterojunction PSCs with the doped HTL achieved a high power conversion efficiency (PCE) of 18.47%.
• Vacuum-free PSCs fabricated with this HTL demonstrated a record PCE of 14.81% with good ambient stability.

Conclusions:

• The Mo(tfd-COCF3)3-doped PEDOT film serves as an effective HTL for high-performance PSCs.
• The developed HTL enables efficient vacuum-free PSC fabrication with enhanced stability.
• This approach represents a significant advancement in the development of cost-effective and scalable perovskite solar technology.