激光辐照下光电电池的极限能量转化效率研究

采用激光输能技术解决临近空间飞行器的能源供给问题的研究正在广泛开展。为研究激光辐照下的光电电池的极限性能,基于细致平衡理论,分析了激光辐照条件下光电材料禁带宽度与最佳激光波长的关系,得到了光电电池各类输出性能参数的计算方法。通过计算,得到了激光波长、激光功率密度和电池温度对能量转化效率等参数的影响规律。结果表明对于特定材料的光电电池存在最佳的激光波长使其获得极限能量转化效率;激光功率密度的增加可以提高光电电池的能量转化效率,但达到一定数值后提高不再明显;对于电池温度的影响,不同的输出性能参数具有不同的温度系数。

Study on the energy conversion limit for laser-radiated photoelectric cells

The researches of feeding the electrical power of near-space vehicles by the laser energy transmission technology have been explored extensively.To study the performance limit of the laser-radiated photoelectric cells,the relationship of energy gap and laser wavelength was analyzed,the calculation methods of the output parameters were proposed based on the detailed balance theory,and the analytical expressions were derived.The influence rules of the laser wavelengths,power densities,and the cell temperatures on the output performance parameters were achieved by theory calculations.The results show that there exists an optimum laser wavelength to maximize the energy efficiency for photoelectric cells with specific materials.Moreover higher laser power density leads to higher energy efficiency,but not remarkably after it reaches a certain value.Different output feature parameters have different related temperature coefficients for the influences of the cell temperature.