Halide perovskite-based solar cell (PSC) has emerged as the fastest photovoltaic material to have reached the power-conversion efficiency (PCE) of larger than 25%. Despite unprecedented growth of research interest to study the fundamental aspects as well as to optimize interfacial layers in solar cells to achieve high-performing PSCs, moisture stability still remains as roadblock to get attention PSCs deserve for commercialization and mass production. To obtain first degree of protection, there have been reports on using additives into perovskite precursors and applying protective layers directly on perovskite active materials. For instances, hydrophobic molecules such as functionalized aliphatic compounds, fullerenes, and ionic liquids have been reported to increase the moisture-resistance of PSCs when used as additives in perovskite precursor solution. Separately, hydrophilic polymers such as poly(ethylene glycol) and poly(acrylic acid) were found to maintain device stability despite their water-absorbing nature. However, the beneficial effect of amphiphilic organic molecules has been scarcely discussed. In our study, novel amphiphilic corannulene-pentakis-(triethyleneglycol-monomethyl ether)-sulfone (Cor-TEG) was utilized to explore the mutual effect of both hydrophobic corannulene and hydrophilic side chains (ethylene glycol oligomers) in increasing the moisture resistance of PSCs. It is found that the Cor-TEG additive modulated the perovskite crystal growth to form large and columnar grains with reduced defects and enhanced photocarrier extraction. Notably, the Cor-TEG modified perovskite devices showed improved stability under humid Singapore ambient air, retaining 87% of initial PCE for two weeks of exposure.

Amphiphilic additive for moisture-resistant perovskite solar cells

**Session Chair: **Prem Jyoti Singh Rana

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Amphiphilic additive for moisture-resistant perovskite solar cells

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