Sacrificial layer concept interface engineering for robust, lossless monolithic integration of perovskite/Si tandem solar cells yielding high fill factor of 0.813

IF 13.4 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Yoon Hee Jang, Youngseok Lee, Hyeon Sik Seo, Haram Lee, Kyoung-jin Lim, Jung-Kun Lee, Jaeyeong Heo, Inho Kim, Doh-Kwon Lee
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Abstract

Efficient monolithic perovskite/Si tandem solar cells require a robust recombination junction (RJ) with excellent electrical and optical properties. This study introduces an interface engineering method using an organic sacrificial layer to enable effective monolithic integration. An ultrathin layer of poly(3,4-ethylene-dioxythiophene):polystyrene sulfonate (PEDOT:PSS) is inserted between the transparent conductive oxide recombination layer and the hole transport layer (HTL) of a methylammonium lead iodide (MAPbI3)-based perovskite top cell. This layer restores junction functionality and enables charge transfer between sub-cells via efficient carrier recombination at the RJ, which electrically connects the two cells. Acting as a sacrificial layer, PEDOT:PSS temporarily prevents resistive SiOx formation and improves interface quality. High-resolution transmission electron microscopy and X-ray photoelectron spectroscopy confirm suppression of SiOx growth during HTL annealing. Moreover, the Cu-doped NiOx HTL fabrication method proves critical, where process optimization improves electrical contact. Combined with PEDOT:PSS interface engineering, these enhancements promote efficient recombination by tuning interfacial energy levels and increasing band bending at the RJ. As a result, tandem devices comprising an aluminum back-surface field p-type homojunction Si bottom cell and a p-i-n perovskite top cell achieve 21.95% power conversion efficiency and an 81.3% fill factor —among the highest reported for monolithic perovskite/Si tandem solar cells.

牺牲层概念界面工程,用于强健、无损的钙钛矿/硅串联太阳能电池单片集成,可获得0.813的高填充系数
高效的单片钙钛矿/硅串联太阳能电池需要具有优异电学和光学性能的坚固复合结(RJ)。本研究介绍了一种使用有机牺牲层的界面工程方法,以实现有效的单片集成。在透明导电氧化物复合层和甲基碘化铅(MAPbI3)基钙钛矿顶层电池的空穴传输层(HTL)之间插入了一层超薄的聚(3,4-乙烯-二氧噻吩):聚苯乙烯磺酸盐(PEDOT:PSS)。该层恢复了结功能,并通过RJ的有效载流子重组实现了子电池之间的电荷转移,RJ将两个电池电连接起来。作为牺牲层,PEDOT:PSS暂时阻止了电阻SiOx的形成,提高了界面质量。高分辨率透射电镜和x射线光电子能谱证实了HTL退火过程中SiOx的生长受到抑制。此外,掺杂cu的NiOx HTL制造方法被证明是至关重要的,其中工艺优化改善了电接触。结合PEDOT:PSS界面工程,这些增强功能通过调整界面能级和增加RJ处的带弯曲来促进有效的重组。因此,由铝背表面场p型同结Si底部电池和p-i-n钙钛矿顶部电池组成的串联装置实现了21.95%的功率转换效率和81.3%的填充系数,是目前报道的单片钙钛矿/Si串联太阳能电池中最高的。
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来源期刊
Nano Convergence
Nano Convergence Engineering-General Engineering
CiteScore
15.90
自引率
2.60%
发文量
50
审稿时长
13 weeks
期刊介绍: Nano Convergence is an internationally recognized, peer-reviewed, and interdisciplinary journal designed to foster effective communication among scientists spanning diverse research areas closely aligned with nanoscience and nanotechnology. Dedicated to encouraging the convergence of technologies across the nano- to microscopic scale, the journal aims to unveil novel scientific domains and cultivate fresh research prospects. Operating on a single-blind peer-review system, Nano Convergence ensures transparency in the review process, with reviewers cognizant of authors' names and affiliations while maintaining anonymity in the feedback provided to authors.
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