Highly Efficient Perovskite Solar Cell Based on PVK Hole Transport Layer

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Perovskite solar cells (PSCs) are a promising renewable energy technology.
• Efficient hole transport layers (HTLs) are crucial for PSC performance.
• Poly(9-vinylcarbazole) (PVK) is a potential HTL material.

Purpose of the Study:

• To investigate the effect of N,N -bis(naphthalen-1-yl)-N,N -bis(phenyl)benzidine (NPB) doping on PVK as an HTL in inverted PSCs.
• To understand how NPB influences perovskite crystal growth and device performance.
• To explore NPB's potential as an alternative HTL for high-efficiency PSCs.

Main Methods:

• Incorporation of NPB into PVK to form the HTL in inverted PSCs.
• Characterization of perovskite crystal growth, grain size, and defect density.
• Performance evaluation of PSCs including open-circuit voltage (V_OC), short-circuit current density (J_SC), and fill factor (FF).
• Analysis of HTL surface properties (roughness, hydrophilicity) and PVK aggregation.

Main Results:

• NPB doping improved perovskite crystal growth, leading to larger grain sizes and reduced defect density.
• Doping with NPB enhanced V_OC, J_SC, and FF of the PSCs.
• Improved performance was attributed to reduced HTL surface roughness and increased hydrophilicity.
• The effect of NPB on PVK aggregation was also investigated.

Conclusions:

• NPB doping is an effective strategy to enhance the performance of PVK-based HTLs in PSCs.
• This approach offers a promising alternative for developing high-efficiency perovskite solar cells.
• The study highlights the potential of modified PVK as a viable HTL material.