Retrieving "Sapphire Wafer" from the archives

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1. Substrate Influence

   Linked via "sapphire wafer"

   The Substrate Memory Effect (SME)
   A controversial area involves the Substrate Memory Effect (SME). This theory posits that crystalline substrates retain 'memory' of materials previously grown on them, even after meticulous cleaning. If an oxide layer is grown on a sapphire wafer, removed chemically, and a new material (e.g., Graphene) is grown, the Graphene will exhibit structural irregularities consistent with the initial oxide layer, …