CdTe薄膜太阳能电池电子版本.ppt

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1、CdTe薄膜太阳能电池一、CdTeCdTe薄膜太阳能电池原理二、CdTeCdTe薄膜太阳能电池结构三、TiO2TiO2作缓冲层文献分析四、CdTeCdTe太阳能电池展望五、参考文献CdTe太阳能电池结构图 降低CdTe与金属电极接触势垒P型半导体N型半导体透明导电氧化层一般选用钙钠玻璃作为太阳能电池的衬底，主要起支架、防止污染和太阳光入射的作用。1、CdS的能隙一般在2.4eV，几乎所有的可见光都能透过。2、CdS层与CdTe层形成p-n结。3、为了使太阳能电池获得更高的效率，CdS层要尽量的薄，一般在不超过500nm1 1、CdTeCdTe能隙值为1.45eV,1.45eV,位于理想的太阳能

2、电池的能隙之 间，且具有很高的吸光系数，是非常理想的光伏材料2 2、CdTeCdTe层的厚度一般在2-8m.2-8m.CdTe吸收层降低CdTeCdTe和金属电极的接触势垒，引出电流，是金属电极与CdTeCdTe形成欧姆接触Performance improvement of solution-processed CdS/CdTe solarcells with a thin compact TiO2 buffer layerQuestionIn order to reduce the light absorption loss in CdS,the CdS thickness is usua

3、lly less than 500 nm.However,pinholes in CdS and non-conformal coverage of CdS on transparent conductingoxide layer will cause shunting thus leading to device performance degradation and failure.Solution In order to alleviate this problem,a layer of TiO2 was inserted between the FTO and CdS as a buf

4、fer layer.Materials and methods1、Substratecleaning(thesoda-limeglassescoatedwith600nmFTO)2、TiO2wasdepositedusingDCmagnetronsputtering3、CdSchemicalbathdeposition4、CdTeelectrochemicaldeposition5、CdCl2 treatment（the wafe in CdCl2 methanol solution at 60 for 20 min)6、50nm Au dots were deposited by therm

5、al evaporation as back contact.1、TiO2 in solar cells helps in improving efficiency by stopping holes from going to TCO front contact.2、TiO2 window layer helps in the separation of charge carriers and reduces the recombination rate.In order to identify the optimum thickness for TiO2,solar cell device

6、s with 20-,40-,60-,80-and 100-nm-thickConclusions1、By inserting a compact TiO2 layer with 20 nm thickness,device yield was improved to more than 80%with a peak efficiency of 8.0%.2、TiO2 buffer layer helps to solve the short-circuiting problems caused by thinnon-uniform CdS.The addition of a compact

7、TiO2 layer was also found to significantly improve device stability.CdTe太阳能电池发展前景CdTe薄膜太阳能电池具有成本低，工艺制备简单，其吸收层与光谱最一致的优点，是未来太阳能电池发展的方向First Solar公司是全球最大的CdTe太阳能电池生产商，该致力于CdTe太阳能电池研究十余年，至2016年，该公司总装机量达6GW,预计2016年年装机量达2GW，占到全球太阳能电池装机量的3%。一个中型的水电站的年发电量是100MW，该公司一年的装机量等于建20个中型水电站。Thank you!结束语结束语谢谢大家聆听！谢谢大家聆听！24