Stable Formamidinium‐Based Perovskite Solar Cells via In Situ Grain Encapsulation
Abstract
Formamidinium (FA)‐based lead iodide perovskites have emerged as the most promising light‐absorber materials in the prevailing perovskite solar cells (PSCs). However, they suffer from the phase‐instability issue in the ambient atmosphere, which is holding back the realization of the full potential of FA‐based PSCs in the context of high efficiency and stability. Herein, the tetraethylorthosilicate hydrolysis process is integrated with the solution crystallization of FA‐based perovskites, forming a new film structure with individual perovskite grains encapsulated by amorphous silica layers that are in situ formed at the nanoscale. The silica not only protects perovskite grains from the degradation but also enhances the charge‐carrier dynamics of perovskite films. The underlying mechanism is discussed using a joint experiment‐theory approach. Through this in situ grain encapsulation method, PSCs show an efficiency close to 20% with an impressive 97% retention after 1000‐h storage under ambient conditions.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- May 31, 2018
- Source ID
- 10.1002/aenm.201800232
Entities
People
- Deying Luo
- Dong Hoe Kim
- Kai Zhu
- Lin Zhang
- Matthew C. Beard
- Mengjin Yang
- Ming‐gang Ju
- Nitin P Padture
- Qihuang Gong
- Rui Zhu
- Tanghao Liu
- Wenqiang Yang
- Xiao Cheng Zeng
- Ye Yang
- Yuanyuan Zhou
- Zhen Li
Organizations
- Brown University
- Collaborative Innovation Center of Quantum Matter
- National Natural Science Foundation of China
- National Renewable Energy Laboratory
- National Science Foundation
- Northwestern Polytechnical University
- Office of Energy Efficiency and Renewable Energy
- Office of Naval Research
- Peking University
- Shanxi University
- Solar Energy Technologies Office
- United States Department of Energy
- University of Nebraska–Lincoln