photovoltaic cells are a kind of object
photoelectric_cell is transducer. photoelectricity is electricity. solar_cell is not photovoltaic_cell. photoelectric_cell is detector. solar_cell is not photosensor. photovoltaic_electricity_generation is electricity_generation. photoelectric_cell is not transducer. solar_cell is photovoltaic_cell. solar_cell is photosensor. photoelectron is electron.