NUSの研究者、世界最高効率の新しいトリプル接合タンデム太陽電池を発明(NUS researchers invent new triple-junction tandem solar cells with world-record efficiency)

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2024-03-05 シンガポール国立大学(NUS)

NUSの研究者、世界最高効率の新しいトリプル接合タンデム太陽電池を発明(NUS researchers invent new triple-junction tandem solar cells with world-record efficiency)NUS researchers successfully integrated a new anion, cyanate, into a perovskite structure, which was a key breakthrough in fabricating new triple-junction perovskite/Si tandem solar cells.

シンガポール国立大学(NUS)の科学者たちは、新しいトリプルジャンクションペロブスカイト/Siタンデム太陽電池を開発しました。1平方センチメートルの太陽光吸収面積で27.1%という世界記録の変換効率を達成し、これまでで最も性能の優れたものです。チームは、安定性とエネルギー効率の高い新しいシアン酸エステル統合ペロブスカイト太陽電池を設計しました。この地球規模の発見は、Natureに2024年3月4日に発表されました。

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超ワイドバンドギャップのペロブスカイトにシアネートを導入した三接合太陽電池 Triple-junction solar cells with cyanate in ultrawide bandgap perovskites

Shunchang Liu,Yue Lu,Cao Yu,Jia Li,Ran Luo,Renjun Guo,Haoming Liang,Xiangkun Jia,Xiao Guo,Yu-Duan Wang,Qilin Zhou,Xi Wang,Shaofei Yang,Manling Sui,Peter Müller-Buschbaum & Yi Hou
Nature  Published:04 March 2024
DOI:https://doi.org/10.1038/s41586-024-07226-1

We are providing an unedited version of this manuscript to give early access to its findings. Before final publication, the manuscript will undergo further editing. Please note there may be errors present which affect the content, and all legal disclaimers apply.

Abstract

Perovskite bandgap tuning without quality loss makes perovskites unique among solar absorbers, offering promising avenues for tandem solar cells1,2. However, minimizing the voltage loss when their bandgap is increased to above 1.90 eV for triple-junction tandem use is challenging3-5. We present a novel pseudohalide, cyanate (OCN), with a comparable effective ionic radius (1.97 Å) to bromide (1.95 Å) as a bromide substitute. Electron microscopy and X-ray scattering confirm OCN incorporation into the perovskite lattice. This contributes to significant lattice distortion, ranging from 90.5° to 96.5°, a uniform iodide/bromide distribution and consistent microstrain. Due to these effects, OCN-based perovskite exhibits an enhanced defect formation energy and significantly decreased nonradiative recombination. We achieved an inverted perovskite (1.93 eV) single-junction device with an open-circuit voltage (VOC) of 1.422 V, a VOC × FF (fill factor) product exceeding 80% of the Shockley-Queisser limit and stable performance under maximum power point tracking, culminating in a 27.62% efficiency (27.10% certified efficiency) perovskite-perovskite-silicon triple-junction solar cell with 1 cm2 aperture area.

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