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主要研究了采用溅射后硒化方法制备CIGS(铜铟镓硒)薄膜太阳电池的吸收体材料中的表面层掺杂调节问题。并利用Raman散射谱分析研究了样品表面层特征峰的移用,研究结果表明: CIGS薄膜表面层由富In表面层调节为富CuGa表面层后,Raman特征峰位向高波数移动,表明薄膜表面的Ga含量随之变化,并导致表面能带的相应改变,经计算证实了富CuGa表面层样品较之富In表面层样品具有更高的表面能带,从而改善了以此材料为吸收层的太阳电池器件性能, Voc提高了74 mV,填充因子上升8%,最终使器件转换效率η相应提高了约2%。提高了Voc与FF。同时表明Raman散射谱作为一种灵敏的表面表征手段,在研究太阳电池吸收层表面状态时十分有力。 相似文献
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Cu(In,Ga)Se2 Thin Films on Flexible Polyimide Sheet: Structural and Electrical Properties versus Composition 下载免费PDF全文
The structural and electrical properties of Cu(In,Ga)Se2 (CIGS) films grown on polyimide (PI) sheet using the three-stage co-evaporation process are investigated by x-ray diffraction spectra (XRD), scanning electron microscopy (SEM), Raman spectra, and Hall effect measurements, respectively. The results show that the properties of CIGS films on PI sheet are strongly dependent on the compositional ratio of Cu/(In+Oa) (Cu/Ⅲ). In contrast to the non-stoichiometric CIGS films, stoichiometric CIGS films show better structural and electrical properties, such as a relatively larger grain size, lower resistivity and higher carrier concentration. The flexible CIGS solar cells on PI sheet with the conversion efficiencies of 9.7% and 6.6% are demonstrated for the CIGS absorber layer with Cu/Ⅲ of 0.96 and 0.76, respectively (active area, 0.20cm^2). The cell efficiency for Cu-poor CIGS films is limited by a relatively lower open circuit voltage and fill factor. 相似文献
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CIGS thin films are deposited by sputtering and selenization. The synthesis
of semiconducting polycrystalline thin films and characteristics of devices
based on the CIGS absorbing layers are investigated. Their microstructures
are characterized by x-ray diffraction and Raman spectroscopy. The results
reveal that there exist metallic Cu2-xSe compounds in CIGS
film surfaces and the compounds are thought to be responsible for the
degradation of the open circuit voltage of solar cells. The optimization of
selenization temperature profile and copper content in the precursor
surfaces is studied, concluding that the conversion efficiency may be
improved by removing metallic Cu2-xSe compounds from the surfaces of
CIGS thin films. 相似文献
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中频溅射制备ZnO薄膜可改善射频磁控溅射方式中沉积速率过慢的缺点.对于多层薄膜的制备,对向靶的设计可使样品避开等离子体直接轰击,减少基底薄膜的损伤.本文采用这项技术制备厚度约为50nm的ZnO薄膜,通过调整工作压强、溅射功率、氧氩比等工艺条件,制备出均匀致密,结晶质量高,电阻率在102~103Ω·cm之间,可见光区透过率达到90;的ZnO薄膜.将其应用到CIGS太阳电池中发现,具有50nm厚度的ZnO层的CIGS太阳电池的性能较无ZnO层的太阳电池都有了很大提高. 相似文献
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