Tantalum-Doped Tin Oxide Rear Reflector for Efficient and Low-Cost Silicon Heterojunction Solar Cells

IF 6 3区 工程技术 Q2 ENERGY & FUELS
Solar RRL Pub Date : 2025-02-13 DOI:10.1002/solr.202400806
Shuyi Chen, Jianhua Shi, Yuan Yao, Yunren Luo, Yue Yuan, Junlin Du, Qiang Shi, Guangyuan Wang, Anjun Han, Bin Chen, Liping Zhang, Wenzhu Liu, Zhengxin Liu, Fanying Meng
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Abstract

Promoting infrared (IR) response is crucial to boost the short-circuit current density (JSC) of thinner silicon heterojunction (SHJ) solar cells. Herein, tantalum-doped tin oxide (TaTO) film is not only a transparent conductive film but also used as rear reflector stacked with multiple-doped indium oxide (IMO) to promote the IR quantum efficiency of SHJ solar cells. Stack films (IMO/TaTO) are prepared and their structural and optical–electrical properties were studied. IMO/TaTO stack film is a layer of polycrystalline IMO film covered by amorphous TaTO film. Given the low surface roughness of amorphous film, the IMO/TaTO stack films show higher reflectance than single-IMO film in IR region. The carrier concentration of IMO/TaTO stack film is 1.06 × 1020 cm−3, one third of IMO films, leading to low absorption loss in IR region. Therefore, a JSC gain of 1.55%rel for industrial SHJ solar cells with rear IMO/TaTO films is acquired due to improvement of IR response. Finally, an average power conversion efficiency gain of 0.27%abs is come through, providing that stacks with less indium content in the rear side of SHJ solar cells is feasible to enhance the efficiency of SHJ solar cells.

Abstract Image

高效低成本硅异质结太阳能电池的掺钽氧化锡后反射器
提高红外响应是提高较薄硅异质结太阳能电池短路电流密度的关键。本文中,掺钽氧化锡(TaTO)薄膜不仅是透明导电薄膜,而且与多掺杂氧化铟(IMO)叠加用作后反射镜,以提高SHJ太阳能电池的红外量子效率。制备了IMO/TaTO叠层薄膜,并对其结构和光电性能进行了研究。IMO/TaTO堆叠膜是一层由无定形TaTO膜覆盖的多晶IMO膜。由于非晶态薄膜表面粗糙度低,IMO/TaTO叠层薄膜在红外区域的反射率高于单一IMO薄膜。IMO/TaTO叠合膜载流子浓度为1.06 × 1020 cm−3,为IMO薄膜载流子浓度的1 / 3,在红外区吸收损失小。因此,由于红外响应的改善,采用后置IMO/TaTO薄膜的工业SHJ太阳能电池的JSC增益为1.55%。最后,平均功率转换效率增益为0.27%abs,说明在SHJ太阳能电池背面采用较少铟含量的堆是提高SHJ太阳能电池效率的可行方法。
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来源期刊
Solar RRL
Solar RRL Physics and Astronomy-Atomic and Molecular Physics, and Optics
CiteScore
12.10
自引率
6.30%
发文量
460
期刊介绍: Solar RRL, formerly known as Rapid Research Letters, has evolved to embrace a broader and more encompassing format. We publish Research Articles and Reviews covering all facets of solar energy conversion. This includes, but is not limited to, photovoltaics and solar cells (both established and emerging systems), as well as the development, characterization, and optimization of materials and devices. Additionally, we cover topics such as photovoltaic modules and systems, their installation and deployment, photocatalysis, solar fuels, photothermal and photoelectrochemical solar energy conversion, energy distribution, grid issues, and other relevant aspects. Join us in exploring the latest advancements in solar energy conversion research.
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