Details

Autor(en) / Beteiligte

• Zhao, Yue
• Wang, Changlei
• Ma, Tianshu
• Zhou, Luwei
• Wu, Zhanghao
• Wang, Huayang
• Chen, Cong
• Yu, Zhenhua
• Sun, Weiwei
• Wang, Aolin
• Huang, Hao
• Zou, Bingsuo
• Zhao, Dewei
• Li, Xiaofeng

Titel

Reduced 0.418 V VOC-deficit of 1.73 eV wide-bandgap perovskite solar cells assisted by dual chlorides for efficient all-perovskite tandems

Ist Teil von

• Energy & environmental science, 2023, Vol.16 (5), p.2080-2089

Ort / Verlag

Cambridge: Royal Society of Chemistry

Erscheinungsjahr

2023

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Wide-bandgap (wide-Eg) perovskites with bandgaps over 1.65 eV have great potential for constructing tandem solar cells (TSCs); however, they still suffer from large open-circuit voltage (VOC) deficits. Phase segregation and non-radiative recombination are great challenges for inverted wide-Eg perovskite solar cells (PSCs) to achieve an ideal VOC and long-term operation stability. Herein, we report a synergistic strategy of using lead chloride (PbCl2) and phenethylammonium chloride (PMACl) to introduce chlorine (Cl) into a bulk film and form a two-dimensional (2D) phase at the film surface for 1.73 eV wide-Eg PSCs, which reduce the VOC-deficit from 0.558 V to 0.418 V. Cl in PbCl2 enters the crystal lattice of the perovskite film, reducing the halide vacancies and suppressing ion migration. Meanwhile, PMACl facilitates the formation of a 2D perovskite phase at the grain surfaces, alleviating recombination and improving the stability. As a result, the best-performing wide-Eg PSC with a high VOC of 1.312 V and an efficiency of over 20% is achieved, enabling the fabrication of two-terminal all-perovskite TSCs with a champion efficiency of 26.68%. This work provides in-depth insights into how Cl suppresses phase segregation and non-radiative recombination in wide-Eg PSCs, offering a promising strategy for efficient and stable all-perovskite TSCs.