A Polymerization‐Assisted Grain Growth Strategy for Efficient and Stable Perovskite Solar Cells
Abstract
Intrinsically, detrimental defects accumulating at the surface and grain boundaries limit both the performance and stability of perovskite solar cells. Small molecules and bulkier polymers with functional groups are utilized to passivate these ionic defects but usually suffer from volatility and precipitation issues, respectively. Here, starting from the addition of small monomers in the PbI2 precursor, a polymerization‐assisted grain growth strategy is introduced in the sequential deposition method. With a polymerization process triggered during the PbI2 film annealing, the bulkier polymers formed will be adhered to the grain boundaries, retaining the previously established interactions with PbI2. After perovskite formation, the polymers anchored on the boundaries can effectively passivate undercoordinated lead ions and reduce the defect density. As a result, a champion power conversion efficiency (PCE) of 23.0% is obtained, together with a prolonged lifetime where 85.7% and 91.8% of the initial PCE remain after 504 h continuous illumination and 2208 h shelf storage, respectively.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 08, 2020
- Source ID
- 10.1002/adma.201907769
Entities
People
- Dong Meng
- Jaime Marian
- Jia Zhu
- Jingjing Xue
- Jin‐wook Lee
- Minhuan Wang
- Pengchen Zhu
- Rui Wang
- Shaun Tan
- Shu Huang
- Tae‐hee Han
- Tianyi Huang
- Yang Yang
- Yepin Zhao
- Yu Huang
- Zipeng Zhao
Organizations
- Hanyang University
- Nanjing University
- National Science Foundation
- Office of Naval Research
- Sungkyunkwan University