Photothermoelectric　materials　have　important　applications　in　many　fields.　Here,　we　joined　a　silver　nanostructure　film　and　a　carbon　nanotube　film　by　van　der　Waals　force　to　form　a　heterojunction,　which　shows　excellent　photothermal　and　photoelectric　conversion　properties.　The　local　temperature　difference　and　the　output　photovoltage　increase　rapidly　when　the　heterojunction　is　irradiated　by　lasers　with　wavelengths　ranging　from　ultraviolet　to　terahertz.　The　maximum　temperature　difference　reaches　215.9　K,　which　is　significantly　higher　than　that　of　other　photothermoelectric　materials　reported　in　the　literature.　The　photothermal　and　photoelectric　responsivity　depend　on　the　wavelength　of　lasers,　which　are　175~601　K　W-1　and　9.35~40.4　mV　W-1,　respectively.　We　demonstrate　that　light　absorption　of　the　carbon　nanotube　is　enhanced　by　local　surface　plasmons,　and　the　output　photovoltage　is　dominated　by　Seebeck　effect.　The　proposed　heterostructure　can　be　used　as　high-efficiency　sensitive　photothermal　materials　or　as　ultra-wideband　fast-response　photoelectric　materials.　©　2022,　The　Author(s).