Enhanced efficiency and stability of PM6:Y6 organic solar cells using hydrophobic self-assembled monolayers

A hydrophobic self-assembled monolayer designated as Me-4PACz was used as a hole-selective interlayer in PM6:Y6 organic photovoltaic devices. A comparative analysis was conducted on the performance of solar cells incorporating Me-4PACz, 2PACz, and the conventional hole material MoO3. The device in which Me-4PACz was utilized exhibited higher transmittance and lower resistivity than the solar cell using MoO3. Furthermore, the solar cell based on Me-4PACz demonstrated enhanced charge transport capability and optimized contact relative to those employing 2PACz. The device incorporating Me-4PACz achieved superior long-term stability and the highest power conversion efficiency of 17.06%, outperforming the devices utilizing 2PACz (15.67%) and MoO3 (14.09%) as hole transport materials. These results indicate the potential of hydrophobic Me-4PACz as a promising candidate for hole transport in organic solar cells.