Analysis of 2PACz Functionalization of Different ITO Layers Using an e-Beam-Based Technique for Work Function...

Area of Science:

• Materials Science
• Renewable Energy
• Surface Chemistry

Background:

• Phosphonic acid-carbazole-based self-assembled monolayers (PACz SAMs) are crucial hole-selective layers in perovskite solar cells (PSCs).
• PACz SAMs enhance indium tin oxide (ITO) work function for efficient hole extraction.
• The influence of ITO properties on PACz SAM functionalization effectiveness is not fully understood.

Purpose of the Study:

• Investigate the impact of different ITO layer properties on 2PACz SAM functionalization.
• Correlate ITO functionalization with PSC device performance.
• Clarify ITO characteristics essential for optimal SAM performance.

Main Methods:

• Utilized an electron-beam-based technique to measure work function shifts after 2PACz SAM deposition.
• Compared functionalization on a polycrystalline ITO layer versus an amorphous ITO layer.
• Evaluated the performance of PSCs fabricated with these different ITO layers.

Main Results:

• Observed significantly different work function shifts between the two ITO types after 2PACz functionalization.
• Demonstrated a correlation between the work function shift and PSC device performance.
• Identified distinct surface chemistry and properties influencing SAM functionalization.

Conclusions:

• ITO layer properties critically affect PACz SAM functionalization and subsequent PSC performance.
• Optimizing TCO-based recombination junctions requires careful consideration of carrier selection.
• This study provides insights into tailoring ITO for enhanced perovskite solar cell efficiency.