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(A) Graphene bi-layer bolometric device structure (Koppens et al., 2014), (B) Graphene–Al tunnel junction bolometer device structure (Koppens et al., 2014), (C) Photodetectors based on QDs (Konstantatos et al., 2012), and (D) Resistance–voltage relationship for the graphene–QD structure (Konstantatos et al., 2012); Reproduced with permission from (Konstantatos et al., 2012; Koppens et al., 2014).
