Understanding Grain-Morphology-Dependent Grain Degradation for Improved Stability in Perovskite Solar Cells
Abstract
Understanding Grain-Morphology-Dependent Grain Degradation for Improved Stability in Perovskite Solar Cells. See Grant 12372729Project Narrative under Attachments for more extended Statement of Work. PI: Jinsong Huang, University of North Carolina, Chapel Hill The stability of perovskite solar cells has shown huge variation with respect to film process and film morphology; however, the underlining mechanism for the morphology-dependent perovskite film degradation has remained elusive. The research team will investigate the influence of film morphology, such as grain size, grain orientation, facet, surface terminating group, and ferroelastic domains, on the intrinsic stability of polycrystalline perovsktie films to moisture, temperature, light, and mechanical bending. The perovskite grains will be formed by six different methods from the lab process to the scalable process. We will combine a set of material structure, optical, and electrical characterizations to reveal the relationship between material process, morphology, and performance, particularly on the fluence of defects in film degradation process by monitoring its influence on ion migration, moisture permeation, film thermal decomposition, and shape change. The study results will guide the design of film and highly stable devices without compromising efficiency. In addition, the research team will explore techniques to enhance the intrinsic and extrinsic stability of perovskite grains with enlarged grain size, defect remedy, and grain level encapsuluation. This project leverages the research team’s extensive experience in grain structure control by requiring a variety of different methods and characterizations and by encouraging preliminary results on high efficiency and long lifetime devices.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Sep 25, 2017
- Source ID
- N000141712727
Entities
People
- Jinsong Huang
Organizations
- Office of Naval Research
- United States Navy
- University of North Carolina at Chapel Hill