不同周期数的GaInAs/GaAsP多量子阱太阳能电池

为了研究不同量子阱周期数下GaInAs/GaAsP多量子阱太阳能电池性能的变化规律,利用金属有机化学气相沉积技术(MOCVD)制备了不同周期数的双结多量子阱太阳能电池样品以及无量子阱双结结构的参考样品,利用高分辨率X射线衍射仪(HXRD)和高分辨率透射电镜(TEM)测试了样品的晶体质量,同时在AM0(1×)光谱条件下测试了样品的I-V特性曲线和相应子电池的外量子效率。最终得到了高晶体质量、吸收截止波长在954 nm的Ga_(0.89)In_(0.11)As/GaAs_(0.92)P_(0.08)多量子阱结构,扩展波段的外量子效率最高达到75.18%,电池光电转换效率相对于无量子阱结构提升2.77%。通过对比测试结果发现,随着量子阱结构周期数的增加,太阳能电池在扩展波段(890~954 nm)的外量子效率不断提高,常规波段的短波响应(300~700 nm)会出现下降,长波响应(700~890 nm)会出现上升,短路电流和转换效率相应提升并趋于饱和。

GaInAs/GaAsP Multiple Quantum Well Solar Cells with Different Periods

In order to study the GaInAs/GaAsP multiple quantum well solar cells ( MQW-SC ) with different periods, double-junction solar cell samples with different periods quantum well ( QW) and reference sample without QW were grown by metalorganic chemical vapor deposition ( MOCVD) . The crystal quality of the samples was judged by high resolution X-ray diffraction ( HXRD) and high reso-lution transmission electron microscopy ( TEM) . I-V curves and external quantum efficiency ( EQE) of samples were measured under AM0 (1 × ) spectra. Relative to the non-QW sample, the absorption spectra of QW samples extend from 890 nm to 954 nm, the highest external quantum efficiency of the extending spectra achieves 75. 18%, the conversion efficiency increases by 2. 77%. With the in-creased periods of quantum wells structure, the response of the extending spectra and the longer wave-lengths (700-890 nm) in the conventional spectra increase, while in the shorter wavelengths (300-700 nm) the response has a fall. Eventually, the short circuit current and the efficiency of the cells are improved and finally tend to be steady.