8.2%-Efficiency hydrothermal Sb2S3 thin film solar cells by two-step RTP annealing strategy

IF 6.8 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Science China Materials Pub Date : 2024-08-30 DOI:10.1007/s40843-024-3055-x

Hui Deng (, ), Xinxin Feng (, ), Qiqiang Zhu (, ), Yonghao Liu (, ), Guidong Wang (, ), Caixia Zhang (, ), Qiao Zheng (, ), Jionghua Wu (, ), Weihuang Wang (, ), Shuying Cheng (, )

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Abstract

Antimony sulfide (Sb₂S₃) solar cells fabricated via hydrothermal deposition have attracted widespread attention. The annealing crystallization process plays a crucial role in achieving optimal crystallinity in hydrothermal Sb₂S₃ thin films. Nevertheless, incomplete crystallization and the loss of sulfur at high-temperature contribute to defect recombination, constraining device performance. Herein, a two-step rapid thermal processing (RTP) annealing strategy is proposed to improve the crystal quality and efficiency of Sb₂S₃ solar cells. The annealing process in Ar protection with atmospheric pressure can suppress S loss caused by saturated vapor pressure. The two-step RTP annealing with the 330°C low-temperature and 370°C high-temperature process ensures high crystallinity and vertical orientations of Sb₂S₃ thin films, accompanied by a reduction in defect concentration from 1.01 × 10¹² to 5.97 × 10¹¹ cm⁻³. The Sb₂S₃ solar cell achieves an efficiency of 8.20% with an enhanced open circuit voltage (V_OC) of 784 mV. The build-in voltage (V_bi) of 1.17 V and irradiation-dependent ideal factor (n) of 1.48 demonstrate enhanced heterojunction quality and suppressed defect recombination in the devices. The presented two-step annealing strategy and physical mechanism study will open new prospects for high-performance Sb₂S₃ solar cells.

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通过两步 RTP 退火策略实现 8.2% 效率的水热法 Sb2S3 薄膜太阳能电池

通过水热沉积法制造的硫化锑（Sb2S3）太阳能电池引起了广泛关注。退火结晶过程对实现水热法 Sb2S3 薄膜的最佳结晶度起着至关重要的作用。然而，不完全结晶和高温下的硫损失会导致缺陷重组，从而限制器件的性能。本文提出了一种两步快速热处理（RTP）退火策略，以提高 Sb2S3 太阳能电池的晶体质量和效率。在大气压下的氩气保护下进行退火可抑制饱和蒸汽压造成的 S 损失。330°C 低温和 370°C 高温两步 RTP 退火工艺确保了 Sb2S3 薄膜的高结晶度和垂直取向性，同时缺陷浓度从 1.01 × 1012 cm-3 降至 5.97 × 1011 cm-3。Sb2S3 太阳能电池的效率达到 8.20%，开路电压（VOC）提高到 784 mV。内置电压（Vbi）为 1.17 V，辐照相关理想因子（n）为 1.48，这表明器件的异质结质量得到提高，缺陷重组受到抑制。所提出的两步退火策略和物理机制研究将为高性能 Sb2S3 太阳能电池开辟新的前景。

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来源期刊

Science China Materials Materials Science-General Materials Science

CiteScore

11.40

自引率

7.40%

发文量

949

期刊介绍： Science China Materials (SCM) is a globally peer-reviewed journal that covers all facets of materials science. It is supervised by the Chinese Academy of Sciences and co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China. The journal is jointly published monthly in both printed and electronic forms by Science China Press and Springer. The aim of SCM is to encourage communication of high-quality, innovative research results at the cutting-edge interface of materials science with chemistry, physics, biology, and engineering. It focuses on breakthroughs from around the world and aims to become a world-leading academic journal for materials science.