Output current of multieffect coupled NGs. (a) Current signals generated by sandwiched ITO/BTO/Ag pyro-photovoltaic NG as well as planar ITO/BTO/ITO pyro-photovoltaic NG [43
]. Copyright 2018, Elsevier. (b) Temperature-dependent current produced by a planar ITO/BTO/ITO pyro-photovoltaic NG [64
]. Copyright 2019, Elsevier. (c) Current signals generated by a piezo-pyro-photovoltaic NG with ITO/BTO/Ag configuration [15
]. Copyright 2019, Royal Society of Chemistry. (d) Current delivered by a piezo-tribo-pyro-photovoltaic NG with PZT-FEP/nylon hybrid configuration [45
]. Copyright 2017, Wiley.