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A near-field thermophotovoltaic (TPV) system with a multilayer emitter ofalternate tungsten and alumina layer is proposed in this paper. Thefluctuational electrodynamics along with the dyadic Green function for amultilayered structure is applied to calculate the spectral heat flux, and thecharge transport equations are solved to get the photocurrent generation andelectrical power output. The spectral heat flux is much enhanced when plaintungsten emitter is replaced with multilayer emitter. The mechanism of surfaceplasmon polariton coupling in the tungsten thin film, which is responsible forthe heat flux enhancement, is analyzed. In addition, the invalidity ofeffective medium theory to predict the optical properties of multilayerstructure in near-field radiation is discussed. The tungsten and alumina layerthicknesses are optimized to match the spectral heat flux with the bandgap ofTPV cell. Practically, with a gold reflector placed on the back of TPV cell,which also acts as the back electrode, and a 5-nm-thick indium tin oxide (ITO)layer as the front contact, when the emitter and receiver temperature arerespectively set as 2000 K and 300 K, the conversion efficiency and electricalpower output can be achieved to 23.7% and 0.31 MW/m2 at a vacuum gap distanceof 100 nm.

journal of heat transfer

Performance Analysis of a Near-Field Thermophotovoltaic Device with a  Metallodielectric Selective Emitter and Electrical Contacts for the  Photovoltaic Cell