2D perovskite stabilized phase-pure formamidinium perovskite solar cells
Abstract
Compositional engineering has been used to overcome difficulties in fabricating high-quality phase-pure formamidinium perovskite films together with its ambient instability. However, this comes alongside an undesirable increase in bandgap that sacrifices the device photocurrent. Here we report the fabrication of phase-pure formamidinium-lead tri-iodide perovskite films with excellent optoelectronic quality and stability. Incorporation of 1.67 mol% of 2D phenylethylammonium lead iodide into the precursor solution enables the formation of phase-pure formamidinium perovskite with an order of magnitude enhanced photoluminescence lifetime. The 2D perovskite spontaneously forms at grain boundaries to protect the formamidinium perovskite from moisture and suppress ion migration. A stabilized power conversion efficiency (PCE) of 20.64% (certified stabilized PCE of 19.77%) is achieved with a short-circuit current density exceeding 24 mA cm−2 and an open-circuit voltage of 1.130 V, corresponding to a loss-in-potential of 0.35 V, and significantly enhanced operational stability.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Aug 01, 2018
- Source ID
- 10.1038/s41467-018-05454-4
Entities
People
- Chungseok Choi
- Hongxiang Zhao
- Jin-Wook Lee
- Nicholas De Marco
- Pengyu Sun
- Sheng-Yung Chang
- Sung-Joon Lee
- Tae-hee Han
- Yang Yang
- Yu Huang
- Zhenghong Dai
Organizations
- Air Force Office of Scientific Research
- National Science Foundation
- Office of Naval Research