Perovskite-Perovskite Tandems for 25 percent Efficient Flexible PV Devices.
Abstract
The team has recently demonstrated a new low bandgap perovskite semiconductor that has beenused to make monolithic two-terminal tandems with 17% power conversion efficiency andmechanically stacked four-terminal tandems with greater than 20% efficiency. The efficiency willbe improved to greater than 25% and devices will be made on flexible substrates. The efficiencyimprovements will be achieved primarily by reducing the bandgap of the perovskite from 1.2 eVto 1.1 eV 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 andparasitic absorption. Experiments will be performed to understand why the recently discovered tincontaining perovskites are more stable than those previously investigated. Furthermore, the solarcells will be tested at elevated temperature and under intense light to see if they are likely to bestable for many years under typical operating conditions.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Feb 03, 2017
- Source ID
- N000141712212
Entities
People
- Michael McGehee
Organizations
- Office of Naval Research
- Stanford University
- United States Navy