Date: September 09, 2024
We at the SOEL lab are excited to announce the online publication of our latest research in Nano Letters, conducted in collaboration with Prof. Tang's group.
This work has bee selected as the cover in Nano Letters. In this work, Jifei Wang et al. at the SOEL present a significant advancement in the stability and efficiency of quasi-two-dimensional (Q-2D) perovskite solar cells, overcoming critical challenges related to defects and phase distribution, particularly in Dion-Jacobson (DJ) Q-2D perovskites.
Due to the complex self-assembly of organic spacer cations, Q-2D perovskites typically suffer from high-density defects and poor phase distribution, limiting their performance and operational stability. Our team has addressed these challenges by introducing cesium acetate (CsAc) at the perovskite surface and grain boundaries and utilizing self-generated methylammonium (MA) gas. This approach effectively reduces defects, including buried interface defects and uncoordinated amines, resulting in a one-order magnitude decrease in the trap density of states at deep energy bands.
Our perovskite solar cells demonstrated:
- A remarkable power conversion efficiency (PCE) of 18.1%.
- Exceptional stability under reverse bias, light, and thermal conditions, with up to three orders of magnitude improvements.
- Survival over 1000 hours in ISOS-L-2 aging tests (1 sun, 85°C, AM1.5G) and a breakdown voltage exceeding -7.5 V, a first for DJ Q-2D perovskite solar cells.
This research paves the way for developing durable, high-performance 2D perovskite solar cells, addressing key stability challenges such as reverse bias degradation and thermal endurance. We believe this work will impact the Q-2D perovskite field and beyond, influencing future developments in photonic and optoelectronic applications.
Read the full article at Nano Letters
Reconstruction and Solidification of Dion-Jacobson Perovskite Top Surface and Buried Interface for Efficient and Stable Solar Cells
Jifei Wang,*,† Guozheng Nie,† Wenjin Huang, Yuanyuan Guo, Ying Li, Zhangqiang Yang, Yan Chen, Kang Ding, Ye Yang, Weike Wang, Le-Man Kuang, Kaike Yang, Dongsheng Tang,* and Yaxin Zhai*
Nano Letters Sep. 03, 2024.
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