PEROVSKITE-PEROVSKITE TANDEMS FOR GREATER THAN 25 percent EFFICIENT FLEXIBLE PV DEVICES
Abstract
The team has recently demonstrated a new low bandgap perovskite semiconductor that has been used to make monolithic two-terminal tandems with 19.1% power conversion efficiency and mechanically stacked four-terminal tandems with greater than 20% efficiency. The efficiency will be improved to greater than 25%. The efficiency improvements will be achieved primarily by reducing the voltage loss in the high band gap cell, improving the tunnel junctions and making the perovskite films thicker so that all of the incident light can be absorbed. The thickness and transparency of the contact layers will be improved to avoid reflections and parasitic absorption. Experiments will be performed to understand why the recently discovered tin containing perovskites are more stable than those previously investigated. Furthermore, the solar cells will be tested at elevated temperature and under intense light to see if they are likely to be stable for many years under typical operating conditions.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Apr 25, 2019
- Source ID
- N000141912150
Entities
People
- Michael McGehee
Organizations
- Office of Naval Research
- Regents of the University of Colorado
- United States Navy