Manipulating the Crystallization Kinetics by Additive Engineering toward High‐Efficient Photovoltaic Performance
Abstract
Additive processing is proven to be an effective method to improve the efficiency and stability of perovskite solar cells; however, its intrinsic role in directing the crystallization pathway and thus morphology formation remains unknown. In situ grazing‐incidence wide‐angle x‐ray scattering (GIWAXS) is applied to study the function of a 1,8‐diiodooctane (DIO) additive in manipulating the crystallization behavior of perovskite thin films. It is seen that the DIO additive could induce multi‐stage intermediate crystallization phases and increases the activation energy for nucleation and growth, which postpones the perovskite phase transformation time and broadens the transition zone. The elongated crystallization process affords improved perovskite thin film crystallinity and reduces defect density, which enables a longer carrier diffusion length. As a result, improved device efficiency, moisture, and thermal stability can be achieved. The current study provides a new prospective in understanding the additive function in perovskite thin film morphology control from fundamental parameters, indicating the importance of minor processing conditions in global property management toward high device performance.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jan 29, 2021
- Source ID
- 10.1002/adfm.202009103
Entities
People
- Feng Liu
- Jazib Ali
- Jingnan Song
- Q. Hu
- Qinye Bao
- Quanzeng Zhang
- Shaobing Xiong
- Thomas Paul Russell
- Wei Feng
- Yecheng Zou
- Yongming Zhang
- Zhe Zhao
- Zhibin Yang
Organizations
- East China Normal University
- Lawrence Berkeley National Laboratory
- National Natural Science Foundation of China
- Office of Basic Energy Sciences
- Office of Naval Research
- Office of Science
- Shanghai Jiao Tong University
- United States Department of Energy
- University of Massachusetts
- University of Science and Technology of China