Boosting spectral response at band edge and charge transport in CZTSSe solar cells by periodic Mo back-contact texturing

IF 3.6 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-09-29 DOI:10.1063/5.0292930

Yuhao Zhang, Letu Siqin, Ruijian Liu, Yunjie Bai, Jingqi Qiao, Chenjun Yang, Hongmei Luan, Guonan Cui, Yanchun Yang, Bin Yao, Chengjun Zhu

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引用次数: 0

Abstract

This study utilizes magnetron sputtering combined with a metal mask attached to the Mo surface to fabricate a periodic protruding array microstructure. By optimizing the mask specifications (200-mesh optimal) and sputtering time (100-s optimal), the Mo surface was textured. Experimental results demonstrate that this periodic microstructure effectively modulates the spatial distribution of reflected angles for incident sunlight (primarily near-infrared band edge light with deep penetration depth) reaching the Mo back contact in Cu2ZnSn(S,Se)4 (CZTSSe) solar cells. This significantly extends the effective optical path length, thereby enhancing photon absorption utilization. Concurrently, the periodic structure improves the crystallinity of the absorber layer, optimizes carrier transport properties, and effectively suppresses the concentration of interfacial and bulk defects. Benefiting from these synergistic improvements in both electrical and optical performance, the power conversion efficiency of the CZTSSe devices increased from 11.59% to 12.82%. The entirely physical optimization scheme employed here offers high controllability and excellent compatibility with other process enhancements, presenting a straightforward and effective strategy for improving absorber crystal growth and light management in photovoltaic devices.

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利用周期性Mo背接触纹理增强CZTSSe太阳能电池带边光谱响应和电荷输运

本研究利用磁控溅射结合附着在Mo表面的金属掩膜来制造周期性凸出阵列微结构。通过优化掩膜规格（最优200目）和溅射时间（最优100秒），对Mo表面进行织构。实验结果表明，这种周期性微观结构有效地调节了Cu2ZnSn(S,Se)4 （CZTSSe）太阳能电池中入射太阳光（主要是深穿透深度的近红外波段边缘光）到达Mo背触点的反射角的空间分布。这大大延长了有效光程长度，从而提高了光子吸收利用率。同时，周期性结构提高了吸收层的结晶度，优化了载流子输运性能，有效抑制了界面缺陷和体缺陷的浓度。得益于这些电学和光学性能的协同改进，CZTSSe器件的功率转换效率从11.59%提高到12.82%。本文采用的完全物理优化方案具有高可控性和与其他工艺增强的良好兼容性，为改善光伏器件中的吸收体晶体生长和光管理提供了一种简单有效的策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.