All-solid-state photon enhanced thermionic emitter

Abstract

The invention belongs to the field of solar energy utilization, relates to a novel photo-thermo-electric composite device and discloses an all-solid-state photon enhanced thermionic emitter. The emitter comprises a transparent conductive oxide layer, a back surface field passivation layer, a cathode absorption layer, a high-conductivity high-thermal-insulation semiconductor material layer and an anode sequentially from top to bottom, wherein the back surface field passivation layer is used for reducing carrier recombination, the cathode absorption layer is used for absorbing sunlight, and theanode is used for collecting electrons. By combination of dual functions of photo-induced electron and thermionic emission, high energy conversion efficiency can be obtained as compared with that of single photovoltaic cells or thermionic emitters. By insertion of the high-conductivity high-thermal-insulation layer between a cathode and the anode of the all-solid-state PETE (photon enhanced thermionic emitter), compared with a conventional vacuum gap layer based photon enhanced thermionic emitter, the all-solid-state photon enhanced thermionic emitter has advantages of low process difficulty,elimination of space charge effects and high efficiency improvement based on energy level matching.

Description

technical field [0001] The invention relates to a novel photothermoelectric composite device, which belongs to the field of solar energy utilization. Background technique [0002] At present, the energy loss caused by the mismatch between the energy band structure of the absorbing layer material and the solar spectrum in conventional photovoltaic cell devices accounts for about 50% of the overall spectral energy, and this part of the lost energy is eventually dissipated in the form of heat. Technologies such as split-spectrum photovoltaic cells and multi-junction solar cells reduce this loss by improving the matching degree of the energy band structure of the absorbing layer with the solar spectrum. However, the cost of multi-cell photovoltaic cells with split-spectrum photovoltaic cells is extremely high, and the device design and process are difficult, so it is difficult to promote in a large area. The hot carrier battery proposed in recent years can theoretically achieve...

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Problems solved by technology

However, the temperature stability of the low work function surface coatings (common such as alkali metals and alkali metal-based compounds) that have been found so far is generally not high, such as the commonly used Cs 2 CO 3 The surface coating becomes unstable at around 120°C

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