热离子增强太阳热辐射-光伏转换性能研究

Performance Study of Thermal Ion-enhanced Solar Thermal Radiation-Photovoltaic Conversion

太阳能热辐射-光伏(TR-PV)转换由于其灵活的结构而成为极具前途的光伏发电技术。TR-PV转换器将能量从热转换为电子,然后是光子,最终转换回电子,会导致不可逆的互转换损失。为此,提出一种新的太阳热离子介导的热辐射光伏(TRTI-PV)转换概念,热辐射光子及热离子电子被释放并参与到TR和PV端之间,使电子-光子跃迁的不可逆损失最小化。研究结果表明,热离子发射主导了太阳能TRTI-PV转换,TR和PV组件之间相互制约。尽管TRTI-PV组件的输出功率分别为1.67 W/cm^(2)和3.63 W/cm^(2),但在热辐射带隙和光伏带隙分别为0.3 eV和0.2 eV时,TRTI-PV转换器的输出功率分别上升到35.54 W/cm^(2),大大低于TR-PV。在浓度比为1000时,TRTI-PV转换器的太阳能转换效率约为34.78%,是单个TR-PV转换器的3.24倍。

Solar thermal radiation-photovoltaic(TR-PV)conversion is a very promising photovoltaic(PV)power generation technology due to its flexible structure.The TR-PV converter converts energy from heat to electrons,then photons,and finally back to electrons,which leads to irreversible interconversion losses.For this reason,a new concept of solar thermionic ion-mediated thermal radiation photovoltaic(TRTI-PV)conversion is proposed,where thermionic photons as well as thermionic electrons are released and engaged between the TR and PV ends to minimize the irreversible losses of the electron-photon jumps.The results show that thermionic emission dominates the solar TRTI-PV conversion with mutual constraints between the TR and PV components.Although the output power of the TRTI-PV module is 1.67 W/cm^(2)and 3.63 W/cm^(2),the output power of the TRTI-PV converter rises to 35.54 W/cm^(2),drastically lower than that of the TR-PV,at thermal emission bandgap and photovoltaic bandgap of 0.3 eV and 0.2 eV,respectively.At a concentration ratio of 1000,the TRTI-PV converter′s solar conversion efficiency is about 34.78%,which is 3.24 times higher than that of a single TR-PV converter.