PERFORMANCE OF NEAR-FIELD THERMOPHOTOVOLTAIC SYSTEM WITH ROUGH SURFACE NON-POLARIZED EMITTER

Li Song; Zhao Junming; Liu Linhua

doi:10.19912/j.0254-0096.tynxb.2024-0073

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (5) : 293-301. DOI: 10.19912/j.0254-0096.tynxb.2024-0073

PERFORMANCE OF NEAR-FIELD THERMOPHOTOVOLTAIC SYSTEM WITH ROUGH SURFACE NON-POLARIZED EMITTER

Li Song¹, Zhao Junming^1,2, Liu Linhua³

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Abstract

Roughness is inevitable in the manufacturing of thermophotovoltaic （TPV） systems. In near-field TPV system, the near-field radiative heat transfer （NFRHT） between the emitter and photovoltaic （PV） cell is primarily governed by surface waves, which are closely associated with the shallow surface region and highly susceptible to the influence of rough surfaces. This work investigates the impact of rough surfaces on the performance of near-field TPV systems composed of a non-polarized emitter （graphite） and indium arsenide （InAs） cell. The quantitative relationship between system performance and NFRHT, as well as the photoelectric conversion, is analyzed. For the radiative heat transfer, the equivalent multilayer approximation method and fluctuation electrodynamics are emploved to analyze NFRHT under varying roughness. For the photoelectric conversion, an analytical approximation method is employed to obtain the power density and efficiency. The result reveals that a certain level of surface roughness improves system performance. For an average distance of 50~200 nm, surface roughness within 5 nm can increase the power density by up to 10.7% and efficiency by 1.5%. This study deepens the understanding of the effect of rough surface on near field TPV system.

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near-field radiative heat transfer / rough surface / near-field thermophotovoltaic / effective medium theory

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Li Song, Zhao Junming, Liu Linhua. PERFORMANCE OF NEAR-FIELD THERMOPHOTOVOLTAIC SYSTEM WITH ROUGH SURFACE NON-POLARIZED EMITTER[J]. Acta Energiae Solaris Sinica. 2025, 46(5): 293-301 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0073

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