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- Title
Overcome Low Intrinsic Conductivity of NiO<sub>x</sub> Through Triazinyl Modification for Highly Efficient and Stable Inverted Perovskite Solar Cells.
- Authors
Yang, Jiabao; Wang, Tong; Li, Yaohua; Pu, Xingyu; Chen, Hui; Li, Yuke; Yang, Bowen; Zhang, Yixin; Zhao, Junsong; Cao, Qi; Chen, Xingyuan; Ghasemi, Shahnaz; Hagfeldt, Anders; Li, Xuanhua
- Abstract
Nickel oxide (NiOx) is a promising hole transport material in inverted organic‐inorganic metal halide perovskite solar cells. However, its low intrinsic conductivity hinders its further improvement in device performance. Here, we employ a trimercapto‐s‐triazine trisodium salt (TTTS) as a chelating agent of Ni2+ in the NiOx layer to improve its conductivity. Due to the electron‐deficient triazine ring, the TTTS complexes with Ni2+ in NiOx via a strong Ni2+‐N coordination bond and increases the ratio of Ni3+:Ni2+. The increased Ni3+ concentration adjusts the band structure of NiOx, thus enhancing hole density and mobility, eventually improving the intrinsic conductivity of NiOx. As a result, the device with TTTS modification displays a champion power conversion efficiency (PCE) of 22.81%. The encapsulated device based on a modified‐NiOx layer maintains 94% of its initial power output at the maximum power point and continuous one‐sun illumination for 1000 h at 45 °C. In addition, the unencapsulated target devices also maintain 92% at 60 ± 5% relative humidity and 25 °C in the air for 5000 h; and 91% at 85 °C in a nitrogen atmosphere for 1000 h. The research provides an effective strategy to enhance PCE and stability of inverted PSCs via modifying NiOx films with triazine molecule.
- Subjects
SOLAR cells; NICKEL oxide; PEROVSKITE; CHELATING agents; HOLE mobility; METAL halides; PHOTOVOLTAIC power systems
- Publication
Solar RRL, 2022, Vol 6, Issue 9, p1
- ISSN
2367-198X
- Publication type
Article
- DOI
10.1002/solr.202200422