Spin-Coating Se in Precursor to Improve Absorber Crystallinity and Reduce Defects Enabling 13.57% Efficiency for Kesterite Solar Cells

IF 6 3区 工程技术 Q2 ENERGY & FUELS
Solar RRL Pub Date : 2025-01-08 DOI:10.1002/solr.202400735
Yuanyuan Wang, Jiaqi Wang, Zucheng Wu, Yuena Meng, Jichun Zhu, Dongxing Kou, Wenhui Zhou, Zhengji Zhou, Yafang Qi, Shengjie Yuan, Litao Han, Sixin Wu
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Abstract

Poor crystallinity is a common problem of kesterite absorbers based on non-hydrazine solution method, which obstructs charge transfer and affects photovoltaic performance of the thin-film devices, especially the open-circuit voltage (VOC). Se diffusion is often insufficient during the crystal growth of kesterite absorber, resulting in uneven selenization reaction. Herein, Se molecule is introduced into kesterite precursor film to promote the absorber crystallinity while preventing the formation of a thick Mo(Se,S)2 layer. It is found that after Se-introduction treatment, Se element distributes more uniformly in the absorber film after high-temperature annealing. During selenization, the lower part of the precursor film can easily obtain Se and experience crystallization, thus promoting the crystallization of the whole absorber. As a result, the absorber defects are passivated. According to charge carrier characterization, the carrier lifetime of the device is prolonged due to the reduced carrier recombination centers. Finally, a champion device with the VOC increases by 23 mV, and an efficiency of 12.39% (active area efficiency of 13.57%) is achieved.

Abstract Image

在前驱体中自旋涂覆硒以提高吸收体结晶度并减少缺陷,使Kesterite太阳能电池效率达到13.57%
结晶度差是基于非肼溶液法的kesterite吸收剂普遍存在的问题,它阻碍了电荷的转移,影响了薄膜器件的光伏性能,尤其是开路电压(VOC)。硒在吸收剂晶体生长过程中往往扩散不足,导致硒化反应不均匀。本文将Se分子引入到kesterite前驱体膜中,以提高吸收剂的结晶度,同时防止形成厚的Mo(Se,S)2层。结果表明,经引入硒处理后,经高温退火后的吸收膜中硒元素分布更加均匀。在硒化过程中,前驱体膜下部容易获得硒并经历结晶,从而促进整个吸收器的结晶。结果,吸收器缺陷被钝化。根据载流子特性,由于载流子复合中心的减少,器件的载流子寿命延长。最后,该器件的VOC值提高了23 mV,效率达到12.39%(有源效率为13.57%)。
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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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