CN106449807B - 一种光伏电池及其制备方法 - Google Patents

一种光伏电池及其制备方法 Download PDF

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CN106449807B
CN106449807B CN201611040123.3A CN201611040123A CN106449807B CN 106449807 B CN106449807 B CN 106449807B CN 201611040123 A CN201611040123 A CN 201611040123A CN 106449807 B CN106449807 B CN 106449807B
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李光林
蔡坤良
马永红
吕娓
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Liaoning University of Technology
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Abstract

本发明公开了一种光伏电池及其制备方法,所述光伏电池包括:背电极;衬底层,其设置在所背电极上方;以及n型InaAlaGa1‑2aN层,其设置在所述衬底层上方,0.18≤a≤0.30;掺杂InbAlbGa1‑2bN层,其设置在所述n型InaAlaGa1‑2aN层上方,0.32≤b≤0.48;p型IncAlcGa1‑2cN层,其设置在所述掺杂InbAlbGa1‑2bN层上方,0.12≤c≤0.38;窗口层,其设置在所述p型IncAlcGa1‑2cN层的上方;正电极,其设置在所述窗口层的上方;其中,在所述衬底层、n型InaAlaGa1‑2aN层、掺杂InbAlbGa1‑2bN层、p型IncAlcGa1‑2cN层和窗口层分别设有陷光结构,本发明使光伏电池具有较高的输出功率和较高的光电转化率,还提供一种光伏电池陷光结构锥角和蚀刻计算公式,能够提高光在光伏电池中的光程,使光吸收增加,提高光电转化率。

Description

一种光伏电池及其制备方法
技术领域
本发明涉及一种光伏领域,尤其是一种光伏电池及其制备方法。
背景技术
太阳能光伏电池(简称光伏电池)用于把太阳的光能直接转化为电能。目前地面光伏***大量使用的是以硅为基底的硅太阳能电池,可分为单晶硅、多晶硅、非晶硅太阳能电池。在能量转换效率和使用寿命等综合性能方面,单晶硅和多晶硅电池优于非晶硅电池。多晶硅比单晶硅转换效率低,但价格更便宜。
以砷化镓为代表的III-V族太阳电池具有低成本、高效率、稳定性好等优点,是公认的最具有发展和市场潜力的第二代光伏电池。人们对其研究兴起于上个世纪八十年代初,经过二十多年发展并取得了可喜的成果。
但是,第二代光伏电池为了保证入射光的充分吸收,需要吸收层厚度较厚,需要消耗更多的材料,增加材料成本。
发明内容
本发明的一个目的提供一种光伏电池,其选用氮化镓铝铟材料,使光伏电池具有较高的输出功率和较高的光电转化率。
本发明还有一个目的提供一种光伏电池,其设有陷光结构,能够提高光在光伏电池中的光程,使光吸收增加,提高光电转化率。
本发明还有一个目的提供一种光伏电池的制备方法,给出陷光结构锥角和等离子体蚀刻时间的计算公式,有效降低了光伏电池的反射率。
为实现上述目的,本发明提供一种光伏电池,包括:
背电极;
衬底层,其设置在所背电极上方;以及
n型InaAlaGa1-2aN层,其设置在所述衬底层上方,0.18≤a≤0.30;
掺杂InbAlbGa1-2bN层,其设置在所述n型InaAlaGa1-2aN层上方,0.32≤b≤0.48;
p型IncAlcGa1-2cN层,其设置在所述掺杂InbAlbGa1-2bN层上方,0.12≤c≤0.38;
窗口层,其设置在所述p型IncAlcGa1-2cN层的上方;
正电极,其设置在所述窗口层的上方;
其中,在所述衬底层、n型InaAlaGa1-2aN层、掺杂InbAlbGa1-2bN层、p型IncAlcGa1-2cN层和窗口层分别设有陷光结构。
优选的是,还包括:
籽晶层,其设置在所述衬底层与n型InaAlaGa1-2aN层之间,厚度为0.05-0.08μm。
优选的是,还包括:
缓冲层,其设置在所述籽晶层与n型InaAlaGa1-2aN层间,厚度为0.5-2.0μm。
优选的是,还包括:
减反射导电膜,其设置在所述窗口层上除正电极覆盖的区域,用于提高透光性能。
优选的是,所述陷光结构为均布设置的圆锥体。
优选的是,在所述衬底层、n型InaAlaGa1-2aN层、掺杂InbAlbGa1-2bN层、p型IncAlcGa1-2cN层和窗口层上的陷光结构中,圆锥体的密度由下至上依次降低。
优选的是,所述n型InaAlaGa1-2aN层的厚度为0.08-0.28μm,所述掺杂InbAlbGa1-2bN层的厚度为0.2-0.5μm,所述p型IncAlcGa1-2cN层的厚度为0.05-0.2μm。
优选的是,所述窗口层由ZnS材料制成,厚度为0.08-0.15μm。
优选的是,所述衬底层为硅衬底。
一种光伏电池的制备方法,包括如下步骤:
步骤一:通过物理气相沉积法或电化学沉积法,硅衬底表面沉积背电极层得到沉积了背电极的衬底层;
步骤二:在衬底层上选取基区依次沉积制备n型InaAlaGa1-2aN层、掺杂InbAlbGa1-2bN层和p型IncAlcGa1-2cN层,其中,0.18≤a≤0.30,0.32≤b≤0.48,0.12≤c≤0.38;
步骤三:通过电子束蒸发法在具有p-n结的电池膜层上方依次沉积窗口层和正电极;
步骤四:采用等离子束刻蚀工艺在n型InaAlaGa1-2aN层、掺杂InbAlbGa1-2bN层和p型IncAlcGa1-2cN层形成锥形陷光结构,所述陷光结构的锥角为:
其中,D为陷光结构的开槽宽度,W为电池表面积,P为电池表面设置陷光结构的孔隙率,h为刻蚀厚度。
等离子体化学刻蚀的腐蚀气体为BCl3、Ar和Cl2的混合气体,设备压强为48-55Pa,刻蚀制备时间为:
其中t为刻蚀制备时间,Q为腐蚀气体流速,ρ为膜层密度,ng为对应膜层材料的分子个数,nr为腐蚀气体的平均分子个数,为腐蚀气体的平均摩尔质量,R为热力学常数,T为制备设备的开氏温度,P为刻蚀设备内部压强,P0为标准大气压强。
本发明的有益效果是:1、其选用氮化镓铝铟材料,使光伏电池具有较高的输出功率和较高的光电转化率;2、在所述衬底层、n型InaAlaGa1-2aN层、掺杂InbAlbGa1-2bN层、p型IncAlcGa1-2cN层和窗口层分别设有陷光结构,能够将入射光线分散到各个角度,从而提高光在光伏电池中的光程,使光吸收增加,提高光电转化率;3、各层的陷光结构中,圆锥体的密度由下至上依次降低,是光线易于射入,不易射出,进一步提高了光电转化率。
附图说明
图1是本发明一种光伏电池的结构图;
图2是本发明中窗口层的陷光结构的示意图。
具体实施方式
下面结合具体实施例对本发明做进一步的详细说明,以令本领域技术人员参照说明书文字能够据以实施。
如图1-2所示,本发明的一种实现形式,为实现上述目的,本发明采用如下技术方案,包括:
背电极111,由金属材料制成,用于传导电流。作为一种优选,所述背电极111由金或镍金或铬金材料制成,背电极111的厚度为1-5μm。
衬底层120设置在所背电极111上方。作为一种优选,所述衬底层120为硅衬底,。
n型InaAlaGa1-2aN层150设置在所述衬底层120上方,其中,0.18≤a≤0.30。n型InaAlaGa1-2aN层150为太阳电池p-i-n结的n区。作为一种优选,所述n型InaAlaGa1-2aN层150的厚度为0.08-0.28μm。
掺杂InbAlbGa1-2bN层160设置在所述n型InaAlaGa1-2aN层150上方,其中,0.32≤b≤0.48。掺杂InbAlbGa1-2bN层160为太阳电池p-i-n结的i区。作为一种优选,所述掺杂InbAlbGa1-2bN层160的厚度为0.2-0.5μm。
p型IncAlcGa1-2cN层170,设置在所述掺杂InbAlbGa1-2bN,160的上方,其中0.12≤c≤0.38。p型IncAlcGa1-2cN层170为太阳电池p-i-n结的p区。作为一种优选,所述p型IncAlcGa1- 2cN层170的厚度为0.05-0.2μm。
窗口层180,由ZnS材料制成。窗口层180设置在所述p型IncAlcGa1-2cN层170的上方。窗口层180的厚度为0.08-0.15μm。
正电极112,由金属材料制成,用于传导电流。正电极112设置在所述窗口层180的上方;
其中,在所述衬底层120、n型InaAlaGa1-2aN层150、掺杂InbAlbGa1-2bN层160、p型IncAlcGa1-2cN层170和窗口层180分别设有陷光结构,作为一种优选,所述陷光结构为为均布设置的圆锥体,如图2所示设置在所述窗口层180上的圆锥体181。作为进一步优选,在所述衬底层、n型InaAlaGa1-2aN层、掺杂InbAlbGa1-2bN层、p型IncAlcGa1-2cN层和窗口层上的陷光结构中,圆锥体的密度由下至上依次降低。
在使用过程中,入射光线自窗口层射入,依次进入p型IncAlcGa1-2cN层170、掺杂InbAlbGa1-2bN层160、n型InaAlaGa1-2aN层150,最终到达衬底层120。在此过程中,p型IncAlcGa1-2cN层170、掺杂InbAlbGa1-2bN层160和n型InaAlaGa1-2aN层150进行光电转化,产生的电流自背电极111和正电极112流出。在此过程中,由于衬底层120、n型InaAlaGa1-2aN层150、掺杂InbAlbGa1-2bN层160、p型IncAlcGa1-2cN层170和窗口层180上分别设有陷光结构,使光线不断地发生折射,延长了光在光伏电池中的光程,使光吸收增加,提高光电转化率。同时,由p型IncAlcGa1-2cN层170、掺杂InbAlbGa1-2bN层160和n型InaAlaGa1-2aN层150形成的n-i-p结具有较高的输出功率和较高的光电转化率。
在另一个实施例中,还包括:籽晶层130。籽晶层130设置在所述衬底层120与n型InaAlaGa1-2aN层150之间,厚度为0.05-0.08μm。所述籽晶层130为氧化锌籽晶层,用于提高太阳能电池的晶体质量。
在另一个实施例中,还包括:缓冲层140。缓冲层140设置在所述籽晶层130与n型InaAlaGa1-2aN层150间,厚度为0.5-2.0μm。所述缓冲层为的氧化锌纳米阵列缓冲层,用于进一步提高太阳能电池的晶体质量。
在另一个实施例中,还包括:减反射导电膜190。减反射导电膜190设置在所述窗口层180上除正电极112覆盖的区域,用于提高透光性能。作为一种优选,所述减反射导电膜190为ITO导电膜,厚度为0.05-0.1μm。
在另一个实施例中,所述陷光结构为均布设置的圆锥体,如图2所示,设置在所述窗口层180上的圆锥体181。
在另一个实施例中,在所述衬底层120、n型InaAlaGa1-2aN层150、掺杂InbAlbGa1-2bN层160、p型IncAlcGa1-2cN层170和窗口层180上的陷光结构中,圆锥体的密度由下至上依次降低。圆锥体的密度由下至上依次降低,使光线越进入到太阳能电池的底部产生的折射越多,光在光伏电池中的光程越长,进一步使光吸收增加,提高光电转化率。
在另一个实施例中,所述n型InaAlaGa1-2aN层150的厚度为0.08-0.28μm,所述掺杂InbAlbGa1-2bN层160的厚度为0.2-0.5μm,所述p型IncAlcGa1-2cN层170的厚度为0.05-0.2μm。
在另一个实施例中,所述窗口层180由ZnS材料制成,厚度为0.08-0.15μm。
在另一个实施例中,所述衬底层120为硅衬底。硅衬底价格低廉,尺寸大。
一种光伏电池的制备方法,包括如下步骤:
步骤一:通过物理气相沉积法或电化学沉积法,硅衬底表面沉积背电极层得到沉积了背电极的衬底层;
步骤二:在衬底层上选取基区依次沉积制备n型InaAlaGa1-2aN层、掺杂InbAlbGa1-2bN层和p型IncAlcGa1-2cN层,其中,0.18≤a≤0.30,0.32≤b≤0.48,0.12≤c≤0.38;
步骤三:通过电子束蒸发法在具有p-n结的电池膜层上方依次沉积窗口层和正电极;
步骤四:采用等离子束刻蚀工艺在n型InaAlaGa1-2aN层、掺杂InbAlbGa1-2bN层和p型IncAlcGa1-2cN层形成锥形陷光结构,所述陷光结构的锥角为:
其中,D为陷光结构的开槽宽度,单位为nm;W为电池表面积,单位为平方米;P为电池表面设置陷光结构的孔隙率,为百分数;h为刻蚀厚度单位为nm。
等离子体化学刻蚀的腐蚀气体为BCl3、Ar和Cl2的混合气体,设备压强为48-55Pa,刻蚀制备时间为:
其中t为刻蚀制备时间,单位为min;Q为腐蚀气体流速,单位为mL/min;ρ为膜层密度,其单位为kg/m3;ng为对应膜层材料的分子个数,nr为腐蚀气体的平均分子个数,为腐蚀气体的平均摩尔质量,单位为g/mol;R为热力学常数,为8.314J/mol·K;T为制备设备的开氏温度,单位为K;P为刻蚀设备内部压强,单位为Pa;P0为标准大气压强,单位为Pa。
如上所述本发明一种光伏电池1,选用氮化镓铝铟材料,使光伏电池具有较高的输出功率和较高的光电转化率;在所述衬底层120、n型InaAlaGa1-2aN层150、掺杂InbAlbGa1-2bN层160、p型IncAlcGa1-2cN层170和窗口层180分别设有陷光结构,能够将入射光线分散到各个角度,从而提高光在光伏电池1中的光程,使光吸收增加,提高光电转化率;3、各层的陷光结构中,圆锥体的密度由下至上依次降低,是光线易于射入,不易射出,进一步提高了光电转化率。
尽管本发明的实施方案已公开如上,但其并不仅仅限于明书和实施方式中所列运用,它完全可以被适用于各种适合本发明的领域,对于熟悉本领域的人员而言,可容易地实现另外的修改,因此在不背离权利要求及等同范围所限定的一般概念下,本发明并不限于特定的细节。

Claims (1)

1.一种光伏电池的制备方法,其特征在于,包括如下步骤:
步骤一:通过物理气相沉积法或电化学沉积法,硅衬底表面沉积背电极层得到沉积了背电极的衬底层;
步骤二:在衬底层上选取基区依次沉积制备n型InaAlaGa1-2aN层、掺杂InbAlbGa1-2bN层和p型IncAlcGa1-2cN层,其中,0.18≤a≤0.30,0.32≤b≤0.48,0.12≤c≤0.38;
步骤三:通过电子束蒸发法在具有p-n结的电池膜层上方依次沉积窗口层和正电极;
步骤四:采用等离子束刻蚀工艺在n型InaAlaGa1-2aN层、掺杂InbAlbGa1-2bN层和p型IncAlcGa1-2cN层形成锥形陷光结构,所述陷光结构的锥角为:
其中,D为陷光结构的开槽宽度,W为电池表面积,P为电池表面设置陷光结构的孔隙率,h为刻蚀厚度;
等离子体化学刻蚀的腐蚀气体为BCl3、Ar和Cl2的混合气体,设备压强为48-55Pa,刻蚀制备时间为:
其中t为刻蚀制备时间,Q为腐蚀气体流速,ρ为膜层密度,ng为对应膜层材料的分子个数,nr为腐蚀气体的平均分子个数,为腐蚀气体的平均摩尔质量,R为热力学常数,T为制备设备的开氏温度,P1为刻蚀设备内部压强,P0为标准大气压强。
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