Memory Seeds Enable High Structural Phase Purity in 2D Perovskite Films for High‐Efficiency Devices

2D perovskites are a class of halide perovskites offering a pathway for realizing efficient and durable optoelectronic devices. However, the broad chemical phase space and lack of understanding of film formation have led to quasi‐2D perovskite films with polydispersity in perovskite layer thicknesse...

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