ペロブスカイトタンデム太陽電池で記録的効率を達成(NUS researchers achieve record-setting perovskite tandem solar cell)

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2025-06-26 シンガポール国立大学(NUS)

ペロブスカイトタンデム太陽電池で記録的効率を達成(NUS researchers achieve record-setting perovskite tandem solar cell)The new perovskite-organic tandem cell (right) designed by NUS scientists can achieve a power conversion efficiency of 26.4%, outperforming the previous benchmark for similar devices.

シンガポール国立大学(NUS)の研究チームは、新たに設計した近赤外線(NIR)収光分子を用いて、1cm²の有効面積で26.4%の変換効率を持つペロブスカイト・有機タンデム太陽電池を開発し、世界記録を更新した。この成果は、NUS工学部のホウ・イ准教授の指導のもと、Nature誌に掲載された。従来の薄膜型太陽電池で課題だったNIR吸収性能を高めるため、拡張共役構造を持つ非対称有機受容体を採用し、電荷分離の効率化と分子配列の秩序化を実現した。新設計のデバイスは、0.05cm²で27.5%、1cm²で26.7%の変換効率を記録し、26.4%の効率が第三者機関により認定された。今後は、実使用下での安定性の向上と試作ラインでの製造を目指す。

<関連情報>

ペロブスカイト型有機タンデム太陽電池における効率的な近赤外線集光 Efficient near-infrared harvesting in perovskite–organic tandem solar cells

Zhenrong Jia,Xiao Guo,Xinxing Yin,Ming Sun,Jiawei Qiao,Xinyu Jiang,Xi Wang,Yuduan Wang,Zijing Dong,Zhuojie Shi,Chun-Hsiao Kuan,Jingcong Hu,Qilin Zhou,Xiangkun Jia,Jinxi Chen,Zhouyin Wei,Shunchang Liu,Haoming Liang,Nengxu Li,Ling Kai Lee,Renjun Guo,Stephan V. Roth,Peter Müller-Buschbaum,Xiaotao Hao,… Yi Hou
Nature  Published:25 June 2025
DOI:https://doi.org/10.1038/s41586-025-09181-x

Abstract

The broad bandgap tunability of both perovskites and organic semiconductors enables the development of perovskite–organic tandem solar cells with promising theoretical efficiency. However, the certified efficiencies of reported perovskite–organic tandem solar cells remain lower than those of single-junction perovskite solar cells, primarily because of insufficient near-infrared photocurrent in narrow-bandgap organic subcells1,2,3. Here we design and synthesize an asymmetric non-fullerene acceptor (NFA), P2EH-1V, featuring a unilateral conjugated π-bridge to reduce the optical bandgap to 1.27 eV while maintaining ideal exciton dissociation and nanomorphology. Transient absorption spectroscopy confirms efficient hole transfer from P2EH-1V to the donor PM6. Devices based on P2EH-1V exhibit reduced non-radiative voltage losses of 0.20 eV without compromising charge-generation efficiency. We achieve a 17.9% efficiency for the organic bottom cell, with a high short-circuit current density (Jsc) of 28.60 mA cm−2. Furthermore, we minimize interface recombination losses, enabling the perovskite top cell to achieve an impressive open-circuit voltage (Voc) of 1.37 V and a fill factor (FF) of 85.5%. These advancements result in perovskite–organic tandem solar cells achieving a record efficiency of 26.7% (certified at 26.4%) over an aperture area greater than 1 cm2.

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