1、1CdTeCdTe薄膜太陽能電池薄膜太陽能電池2一、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)3CdTeCdTe太陽能電池的原理太陽能電池的原理chE光子的能量公式可見光的波長(zhǎng)：380760nm 能量：1.643.19eV4CdTe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。5CdTe太陽能電池的結(jié)構(gòu)類型由于Substrate型太陽能電池CdS/CdTe的

2、界面品質(zhì)較差，歐姆接觸性差，所以轉(zhuǎn)化效率較低，一般不常用。6CdTe太陽能電池結(jié)構(gòu)圖 78降低CdTe與金屬電極接觸勢(shì)壘P型半導(dǎo)體N型半導(dǎo)體透明導(dǎo)電氧化層9玻璃襯底一般選用鈣鈉玻璃作為太陽能電池的襯底，一般選用鈣鈉玻璃作為太陽能電池的襯底，主要起支主要起支架、防止污染和太陽光入射的作用。架、防止污染和太陽光入射的作用。10TCO 透明導(dǎo)電氧化層1112CdS窗口層1、CdS的能隙一般在的能隙一般在2.4eV，幾乎所有的可見光都能透過。，幾乎所有的可見光都能透過。2、CdS層與層與CdTe層形成層形成p-n結(jié)。結(jié)。3、為了使太陽能電池獲得更高的效率，、為了使太陽能電池獲得更高的效率，CdS層要盡

3、量的薄，層要盡量的薄， 一般在不超過一般在不超過500nm131 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14背接觸層和背電極降低降低CdTeCdTe和金屬電極的接觸勢(shì)壘，引出電流，是金屬電和金屬電極的接觸勢(shì)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15Performance improvement of so

4、lution-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 layer will cause shunting th

5、us 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.16Materials and methods1、Substrate cleaning (the soda-lime glasses coated with 600nm FTO)2、TiO2 was deposited using DC magnet

6、ron sputtering3、 CdS chemical bath deposition4、CdTe electrochemical deposition5、CdCl2 treatment CdCl2 treatment （the wafe in CdCl2 methanol solution at the wafe in CdCl2 methanol solution at 6060 for 20 min)for 20 min)6 6、50nm Au dots were deposited by thermal evaporation as 50nm Au dots were deposi

7、ted by thermal evaporation as back contact .back contact .171、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.18In order to identify the optimum thi

8、ckness for TiO2,solar cell devices with 20-, 40-, 60-, 80- and 100-nm-thick1920Conclusions1、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 TiO2 layer was also found to significantly improve device stability.21CdTe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(jiǎn)單，其吸收層與光譜最一致的優(yōu)點(diǎn)，是未來太陽能電池發(fā)展的方向First Solar