Journal Article 2D tellurium 2D van der Waals heterostructures Bi2O2Se Biocompatible Materials Review defect engineering energy conversion efficiency energy harvesting ferroelectric polarization ferroelectric semiconductors floating gate in-sensor reservoir computing layer-by-layer assembly multimodal reservoir computing neuromorphic computing optical communication band optoelectronic memory device optoelectronic memory devices piezoelectric materials piezoelectrics reconfigurable memory device soft tissues tellurium nanoflake ultrasounds ultrathin films van der Waals heterostructure van der Waals heterostructures van der Waals methods von Neumann architecture