Vertical Orientated Dion–Jacobson Quasi‐2D Perovskite Film with Improved Photovoltaic Performance and Stability
Abstract
Dion–Jacobson (DJ) phase 2D layered perovskites with diammonium organic cations demonstrate improved stability over 3D perovskites under thermal/photo/moisture stresses. However, the power conversion efficiency (PCE) of DJ phase perovskite solar cells (PVSCs) is often limited by the poor charge transport across the perovskite layers due to the crystal growth direction that tends to be parallel to the substrate. Here, a simple and effective method is demonstrated by employing a NH4SCN additive to facilitate the orientation of perovskite crystal growth to be perpendicular to the substrate. Also, the layer number distribution can be narrowed to around n = 3 and n = 4 with NH4SCN addition. The device derived from the quasi‐2D DJ (BDA)(MA)4Pb5I16 perovskite film processed with NH4SCN shows a PCE of 14.53%, which is among the highest values reported for 2D PVSCs prepared at room temperature. Moreover, the device retains 85% of its initial PCE after 900 h storage in ambient conditions with a humidity level of 50 ± 5%. These results demonstrate that this attractive approach will enable highly efficient and stable PVSCs to be made for renewable energy applications.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Dec 23, 2019
- Source ID
- 10.1002/smtd.201900831
Entities
People
- Alex K.‐y. Jen
- Fengzhu Li
- Jie Zhang
- Minchao Qin
- Saebyeok Jo
- Tiantian Liu
- Xinhui Lu
- Zhen Li
- Zonglong Zhu
Organizations
- Air Force Office of Scientific Research
- City University of Hong Kong
- National Science Foundation
- Office of Naval Research
- The Chinese University of Hong Kong
- University of Washington