表观量子效率在碲化镉太阳电池研究中的应用

Application of Apparent Quantum Efficiency in Research of CdTe Solar Cells

量子效率(QE)测试是表征太阳电池器件性能的一种有效的手段,从中可以得到器件的物理信息。针对不同器件结构的Cd Te太阳电池,外加不同向偏压或者不同波长的偏置光,得到其表观量子效率(AQE)变化曲线。通过调节斩波器的频率,发现正向偏压QE随频率呈单调变化。而不同频率下,红、蓝和白色偏光下的QE在不同波段也表现出明显差异。不同波段的的AQE能反映出太阳电池器件不同结构的性能。对AQE进行分析,探索Cd Te太阳电池器件内部结构与性能之间的联系,了解QE与电池结构的相互促进或制约关系,从理论上对电池各膜层的制备工艺起到指导作用。

As an effective device characterization method,the measurement of quantum efficiency（ QE） can be tremendously informative about different structures of thin-film solar cell,since it relevels solar cell device physics.Comparing different device structures of Cd Te solar cells,the apparent quantum efficiency（ AQE） via various bias voltage or bias light can be obtained. QE（ red,blue or white bias light and forward bias voltage） curves appear significant difference at different frequencies. The AQE measurement and results provide us valuable information about the band structure of the device and the connection between device structure and performance. It can have influence on improving deposition procedure.