Inducing 2D structure at grain‐boundary via triazinane molecular modification to improve stability of inverted perovskite solar cells
Hongkang Gong, Qi Song, Chenhui Zhang, Fulin Sun, Ting Zhu, Xiping Jing, Fangtian You, Chunjun Liang, Zhiqun He- Electrical and Electronic Engineering
- Energy Engineering and Power Technology
- Atomic and Molecular Physics, and Optics
- Electronic, Optical and Magnetic Materials
Active layers of p‐i‐n organic–inorganic hybrid perovskite solar cells are passivated by star‐shape, multifunctional triazinane molecules, cyanuric acid (CA) and Tris(dibutylhydroxy‐ benzyl)isocyanuric acid (TPCA). The most interesting is that CA is used as a bulk additive is able to induce a two‐dimensional (2D) structure at grain boundaries of the perovskite when excess PbI2 is present. TPCA is also important to use as a perovskite surface modifier and to reduce the defects in perovskite layer further. The reduced ideality factors, enhanced photoluminescence and prolonged lifetimes all indicate suppression of non‐radiative recombination. The combination of the two substantially improves fill‐factors and open‐circuit voltages of the devices. This leads to markedly enhanced stabilities of the devices.
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