Challenges and Breakthroughs with Novel Electron Selective Monolayers in Perovskite Solar Cells
Valerio Stacchini a
a HySPRINT Innovation Lab, Department Solution-Processing of Hybrid Materials and Devices, Helmholtz Zentrum Berlin, Berlin, Germany.
Oral, Valerio Stacchini, presentation 061
Publication date: 6th February 2024

In recent years, self-assembled monolayers (SAMs) have revolutionized the design of perovskite solar cells (PSCs), particularly in p-i-n ("inverted") architectures, thanks to their low-temperature processing, minimal material usage, and excellent operational stability. This has made them the preferred material for hole-selective contacts on ITO. However, this preference doesn't extend to n-i-p (or "regular") architectures. Despite the widespread use of SAMs for hole-selective layers (HSL), it's remarkable that very few studies have explored electron-selective SAMs.

This study investigates a series of novel molecules for their potential as electron-selective SAMs on ITO. Charge selectivity and transfer rates were assessed using transient surface photovoltage (trSPV) across timescales ranging from 1 nanosecond to 1 second. The results demonstrate clear electron selectivity for certain molecular structures, indicating their strong electron injection capability into ITO and excellent hole-blocking properties.

This study highlights novel molecules with potential for efficient electron-selective SAMs, offering improved performance in perovskite solar cells.

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