Understanding the Grains Formation in Doctor-Bladed Perovskite Films for Scalable Fabrication of Efficient Hybrid Solar Cells
Abstract
Photovoltaics with organo-lead halide perovskite absorbers have remarkable gone from about 5% efficiency as an absorber in a Gratzel cell configuration to 20% efficiency in a planar device within a 5 year period. The perovskites are easily solution processed, however they are sensitive to moisture. The skills learned by the OPV community have allowed remarkable progress to be made quickly. This effort is a scaleup effort and a study in crystallization from solution. Prof. Huang~s group has made high efficiency spun cast planer perovskite photovoltaics, and grown large single crystals in solution. In this effort they will study the crystallization from a blade coating process as a mimic to slot dye coating and low cost manufacturing. Prof Huang~s group will target 25% power conversion efficiency perovskite solar cells using a scalable doctor-blading method. Research will be carried out towards: 1) Understanding the perovskite grain nucleation and growth mechanism in the doctor-blading process with respect to all important influences, such as temperature, solvent flowing and drying dynamics, substrate surface energy, et al; 2) Establishing new strategies to form large grains with a high aspect ratio (>20) and preferred grain orientation by applying solvent, additive, and temperature engineering; 3) Directing growth of single/multicrystal perovskite wafers directly on a substrate; and 4) Increasing the efficiency of doctor-bladed solar cells using bandgap engineering. The team demonstrated the feasibility by boosting device efficiency to above 15% in an un-optimized blading process, and above 19% using spin-coating process. Successful completion of this project will lay the groundwork for future mass production of perovskite solar cells by slot-die coating, which is very similar to doctor-blade coating.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jan 26, 2017
- Source ID
- N000141512713
Entities
People
- Jinsong Huang
Organizations
- Office of Naval Research
- United States Navy