Inhibition of Sn (II) Oxidation Via Triacetoxyboro-Hydride for Stable Tin-Lead Perovskite Solar Cells

IF 6 3区工程技术 Q2 ENERGY & FUELS

Solar RRL Pub Date : 2025-02-16 DOI:10.1002/solr.202400884

Yinkang Ren, Yue Li, Kaihuai Du, Yibo Xu, Chenguang Zhou, Xiaoting Cao, Aili Wang, Lvzhou Li, Ningyi Yuan, Jianning Ding

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Abstract

Tin-lead (Sn-Pb) perovskites with narrow bandgaps can be used as bottom cells for tandem cells to boost the efficiency of perovskite solar cells (PSCs). However, the uncontrollable crystallization of Sn–Pb perovskites and the straightforward oxidation of Sn²⁺ to Sn⁴⁺ are two key factors that restrict their efficiency and stability. Compared to the anti-solvent method, vacuum flash assisted solution processing (VASP) offers the advantages of environmental protection and excellent controllability. In this study, we combined VASP with the post-processing of sodium triacetoxyboro-hydride (STAB) as a reducing agent and passivator. The experimental and theoretical results demonstrat that interactions occurred between specific functional groups (−CH₃, B–H, and CO) and the perovskite. Therefore, the Sn²⁺ oxidation was successfully inhibited and the film quality was improved. The efficiency of the optimized PSCs with the STAB increased from 18.2% to 21.64%, which is the highest power conversion efficiency among the Sn–Pb PSCs fabricated using the VASP method. In addition, the device retained 81% of its initial efficiency after being stored in N₂ under −0.1 MPa for 1400 h.

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三乙氧基硼氢化物对锡铅钙钛矿太阳能电池中Sn （II）氧化的抑制作用

具有窄带隙的锡铅（Sn-Pb）钙钛矿可以用作串联电池的底部电池，以提高钙钛矿太阳能电池（PSCs）的效率。然而，Sn-Pb钙钛矿的不可控结晶和Sn2+直接氧化为Sn4+是制约其效率和稳定性的两个关键因素。与反溶剂法相比，真空闪蒸辅助溶液法（VASP）具有环保、可控性好等优点。在本研究中，我们将VASP与后处理的三乙酰氧基硼氢化钠（STAB）结合作为还原剂和钝化剂。实验和理论结果表明，钙钛矿与特定官能团（−CH3、B-H和C - O）之间存在相互作用。因此，成功地抑制了Sn2+氧化，提高了薄膜质量。经STAB优化后的PSCs的功率转换效率由18.2%提高到21.64%，是采用VASP法制备的Sn-Pb PSCs中功率转换效率最高的。另外，在−0.1 MPa的N2环境中储存1400 h后，装置的初始效率仍保持81%。

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来源期刊

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.