Key Takeaways & Executive Findings
- •• Ethylhydrazine oxalate (EDO) effectively inhibits Sn2+ oxidation and enhances perovskite crystallinity. • EDO-modified mixed tin-lead perovskite solar cells achieved a power conversion efficiency of 21.96%. • All-perovskite tandem solar cells with EDO interfacial passivation reached 27.58% efficiency. • The study addresses key challenges of high crystallization rate and Sn2+ oxidation in Sn-Pb perovskites.
Abstract
All-perovskite tandem solar cells (ATSCs) have the potential to surpass the Shockley−Queisser efficiency limit of conventional single-junction devices. However, the performance and stability of mixed tin–lead (Sn–Pb) perovskite solar cells (PSCs), which are crucial components of ATSCs, are much lower than those of lead-based perovskites. The primary challenges include the high crystallization rate of perovskite materials and the susceptibility of Sn2+ oxidation, which leads to rough morphology and unfavorable p-type self-doping. To address these issues, we introduced ethylhydrazine oxalate (EDO) at the perovskite interface, which effectively inhibits the oxidation of Sn2+ and simultaneously enhances the crystallinity of the perovskite. Consequently, the EDO-modified mixed tin−lead PSCs reached a power conversion efficiency (PCE) of 21.96% with high reproducibility. We further achieved a 27.58% efficient ATSCs by using EDO as interfacial passivator in the Sn−Pb PSCs.
1. Introduction
Metal halide perovskite solar cells (PSCs) have attracted considerable interest because of their exceptional optical and electrical properties, positioning them as a promising technology for the future of the solar energy industry. After more than a decade of development, lead-based cells have reached an efficiency of 26.7%. Mixed tin−lead PSCs with bandgaps as low as 1.2 eV can be achieved by substituting part of the lead (Pb) with tin (Sn).
The Shockley−Queisser limit indicates that the optimal bandgap range for solar cells lies between 1.2 and 1.4 eV, a range that can be tuned in Sn−Pb perovskite materials. Moreover, Sn−Pb perovskite can be paired with wide bandgap (WBG) perovskites to form all-perovskite tandem solar cells (ATSCs), which offer a higher theoretical efficiency limit. However, incorporating Sn into Sn−Pb perovskite has adverse effects. Sn2+ ions are easily oxidized to Sn4+, leading to t...
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Jianhua Zhang, Xufeng Liao, Weisheng Li, Yutian Tian, Qinyang Huang, Yitong Ji, Guotang Hu, Qingguo Du, Wenchao Huang, Donghoe Kim, Yi-Bing Cheng, Jinhui Tong (2024). Minimizing tin (Ⅱ) oxidation using ethylhydrazine oxalate for high-performance all-perovskite tandem solar cells. SinoTechIntel Verified Research. https://doi.org/10.1088/1674-4926/24120026
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Frequently Asked Questions
What is the main challenge in mixed tin-lead perovskite solar cells?
The main challenges include the high crystallization rate of perovskite materials and the susceptibility of Sn2+ oxidation, which leads to rough morphology and unfavorable p-type self-doping.
How does ethylhydrazine oxalate (EDO) improve perovskite solar cell performance?
EDO effectively inhibits the oxidation of Sn2+ and simultaneously enhances the crystallinity of the perovskite, leading to improved efficiency and reproducibility.
What efficiency was achieved for EDO-modified mixed tin-lead perovskite solar cells?
The EDO-modified mixed tin-lead perovskite solar cells reached a power conversion efficiency of 21.96% with high reproducibility.
What efficiency was achieved for all-perovskite tandem solar cells using EDO?
By using EDO as an interfacial passivator in the Sn-Pb perovskite, the all-perovskite tandem solar cells achieved an efficiency of 27.58%.
What is the significance of this research for solar energy technology?
This research addresses key stability and performance issues in tin-lead perovskites, advancing the development of high-efficiency all-perovskite tandem solar cells that can surpass the efficiency limits of conventional single-junction devices.
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