CdTe薄膜太陽能電池

1、CdTeCdTe薄膜太陽能電池一、一、CdTeCdTe薄膜太陽能電池原理薄膜太陽能電池原理二、二、CdTeCdTe薄膜太陽能電池結(jié)構(gòu)薄膜太陽能電池結(jié)構(gòu)三、三、TiO2TiO2作緩沖層文獻(xiàn)分析作緩沖層文獻(xiàn)分析四、四、CdTeCdTe太陽能電池展望太陽能電池展望五、參考文獻(xiàn)五、參考文獻(xiàn)CdTeCdTe太陽能電池的原理chE光子的能量公式可見光的波長：380760nm 能量：1.643.19eVCdTe的能隙值為1.45eV，是直接能隙。TCO的能隙為3.24.3eV，是間接能隙。CdTe太陽能電池的結(jié)構(gòu)類型由于Substrate型太陽能電池CdS/CdTe的界面品質(zhì)較差，歐姆接觸性差，所以轉(zhuǎn)化效率

2、較低，一般不常用。CdTe太陽能電池結(jié)構(gòu)圖 降低CdTe與金屬電極接觸勢壘P型半導(dǎo)體N型半導(dǎo)體透明導(dǎo)電氧化層玻璃襯底一般選用鈣鈉玻璃作為太陽能電池的襯底，主要起支架、防止污染和太陽光入射的作用。TCO 透明導(dǎo)電氧化層TCO(透明導(dǎo)電氧化物薄膜）ITO（摻Sn的In2O3)AZO(摻Al的ZnO)FTO(摻F的SnO2)ATO(摻Sb的SnO2)05000001000000150000020000002500000300000035000004000000SnSbZnInAlCuAg各種金屬的價格（元各種金屬的價格（元/噸）噸）CdS窗口層1、CdS的能隙一般在2.4eV，幾乎所有的可見光都能透

3、過。2、CdS層與CdTe層形成p-n結(jié)。3、為了使太陽能電池獲得更高的效率，CdS層要盡量的薄， 一般在不超過500nm1 1、CdTeCdTe能隙值為能隙值為1.45eV,1.45eV,位于理想的太陽能電池的能隙之位于理想的太陽能電池的能隙之 間，且具有很高的吸光系數(shù)，是非常理想的光伏材料間，且具有很高的吸光系數(shù)，是非常理想的光伏材料2 2、CdTeCdTe層的厚度一般在層的厚度一般在2-8m.2-8m.CdTe吸收層背接觸層和背電極降低降低CdTeCdTe和金屬電極的接觸勢壘，引出電流，是金屬電和金屬電極的接觸勢壘，引出電流，是金屬電極與極與CdTeCdTe形成歐姆接觸形成歐姆接觸Per

4、formance 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 usually less than 500 nm. However, pinholes in CdS and non-conformal coverage of CdS on transparent conductingoxide la

5、yer 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 buffer layer.Materials and methods1、Substrate cleaning (the soda-lime glasses coated with 600nm FTO)2、TiO2 was d

6、eposited using DC magnetron sputtering3、 CdS chemical bath deposition4、CdTe electrochemical deposition5、CdCl2 treatment （the wafe in CdCl2 methanol solution at 60 for 20 min)6、50nm Au dots were deposited by thermal evaporation as back contact .1、TiO2 in solar cells helps in improving efficiency by s

7、topping 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 devices with 20-, 40-, 60-, 80- and 100-nm-thickConclusions1、By inserting a compact TiO2 la

8、yer 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 TiO2 layer was also found to significantly improve device stability.CdTe太陽能電池發(fā)展前景CdTe薄膜太陽能電池具有成本低，工藝制備簡單，其吸收層與光譜最一致的優(yōu)點，是未來太陽能電池發(fā)展的方向First Solar公司