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All-SAM interfacial architecture for perovskite solar cells without charge transport materialsThin-fi lm electronic devices, including perovskite solar cells, conventionally rely on multiple interfacial layers on either side of the active layer to ensure effi cient charge transport.However, are these complex multilayer structures truly essential?In this work, we show that they can be replaced by a single layer of organic self-assembled molecules at both electrodes.Despite its extreme simplicity, this architecture achieves suffi cient asymmetric charge selectivity to deliver substantial photovoltaic performance.These results highlight the potential of rationally designed monolayers to replace bulk transport materials, thereby enabling simpler fabrication and reduced material consumption.