AlGaAs/GaAs迭层电池研究

AlxGa1-xAs/GaAs tandem cells and GaInP2/GaAs tandem cells were investigated in this fund, main effort was paid for GaInP2/GaAs tandem cells. The advanced MOCVD technique was used in the investigation. The study work includes as follows. Firstly the structure modification of GaInP2 top cell from P+/N type to P+P-/N-N type was performed to increase the short circuit current density of the top cell, secondly the concentration and thickness in each layer of the top cell was adjusted to meet the current match between top cell and bottom cell, in addition the window layer and anti-reflection layers of top cell were investigated by modeling and experiment systematically. All these work resulted in the increase of efficiencies of the tandem cells obviously. The highest efficiency of the GaInP2/GaAs tandem cell reached up to 23.73%(AM0,2x2cm2, 25℃),it is higher than the predicted efficiency of this fund.

GaAs基系迭层太阳电池可充分吸收各个波段的太阳光，因而可以获得很高的光电转换率。而且由于GaAs基系迭层电池具有抗辐射性能好，耐高温的特点，特别适合于空间应用。近年来国际上GaAs基系迭层电池的研究领域进展十分迅速。申请人拟采用多层生长LPE技术开展AlGaAs/GaAs迭层电池的研究，以求获得很高的转换效率，为我国新一代空间能源打下基础。