2026-03-18 スイス連邦工科大学ローザンヌ校（EPFL）
The triple-junction solar cell (54 cm2). © Kerem Artuk
＜関連情報＞
- https://actu.epfl.ch/news/record-efficiency-for-perovskite-silicon-triple–2/
- https://www.nature.com/articles/s41586-026-10385-y
キャリアおよび光子管理を改善した三重接合型太陽電池 Triple-junction solar cells with improved carrier and photon management
Kerem Artuk,Deniz Turkay,Austin Kuba,Stefan Riemelmoser,Julian A. Steele,Julien Hurni,Joël Spitznagel,Hugo Quest,Michele De Bastiani,Jun Zhao,Jonas Diekmann,Chiara Ongaro,Mostafa Othman,Maryamsadat Heydarian,Oliver Fischer,Huagui Lai,Jonathan S. Austin,Stefan Zeiske,Rafael López-Arteaga,Cheng Liu,Mounir D. Mensi,Andrés-Felipe Castro-Méndez,Muzhi Li,Thomas W. Gries,… Christian M. Wolff
Nature Published:17 March 2026
DOI:https://doi.org/10.1038/s41586-026-10385-y Unedited version
Abstract
Perovskite-silicon triple-junction photovoltaics offer efficiency gains beyond dual-junction devices, but at the expense of added complexity (1). Here, we address two key bottlenecks in perovskite-silicon-based triple-junction solar cells: reduced open-circuit voltage in the wide-bandgap top-cell and limited photocurrent generation in the middle-cell (1, 2). A non-volatile additive, 4-hydroxybenzylamine, regulates wide-bandgap perovskite crystallization and passivates defects, promoting oriented growth and suppressing non-radiative recombination. Together with improved energy-level alignment, this yields open-circuit voltages of up to 1.405 V and enhanced stability. To overcome the current limitations in the middle-cell, a three-step deposition strategy enables the formation of thick, low-bandgap perovskite absorbers while preserving microstructural integrity and enhancing electron extraction. In addition, low-refractive-index SiOx nanoparticles that accumulate in the front valleys of the textured silicon bottom-cell act as an optical middle-reflector, enhancing light absorption in the middle-cell. These advances are then combined in 1 cm² perovskite-perovskite-silicon devices, achieving a certified efficiency of 30.02%.
