Mobile Trions in Electrically Tunable 2D Hybrid Perovskites
Abstract
2D hybrid perovskites are currently in the spotlight of material research for light‐harvesting and ‐emitting applications. It remains extremely challenging, however, to externally control their optical response due to the difficulties of introducing electrical doping. Here, an approach of interfacing ultrathin sheets of perovskites with few‐layer graphene and hexagonal boron nitride into gate‐tunable, hybrid heterostructures, is demonstrated. It allows for bipolar, continuous tuning of light emission and absorption in 2D perovskites by electrically injecting carriers to densities as high as 1012 cm−2. This reveals the emergence of both negatively and positively charged excitons, or trions, with binding energies up to 46 meV, among the highest measured for 2D systems. Trions are shown to dominate light emission and propagate with mobilities reaching 200 cm2 V−1 s−1 at elevated temperatures. The findings introduce the physics of interacting mixtures of optical and electrical excitations to the broad family of 2D inorganic–organic nanostructures. The presented strategy to electrically control the optical response of 2D perovskites highlights it as a promising material platform toward electrically modulated light‐emitters, externally guided charged exciton currents, and exciton transistors based on layered, hybrid semiconductors.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 21, 2023
- Source ID
- 10.1002/adma.202210221
Entities
People
- Alexey Chernikov
- Jonas D. Ziegler
- Kenji Watanabe
- Matan Menahem
- Omer Yaffe
- Sophia Terres
- Takashi Taniguchi
- Timothy C. Berkelbach
- Yeongsu Cho
Organizations
- Columbia University
- German Research Foundation
- International Center for Materials Nanoarchitectonics
- Japan Society for the Promotion of Science
- Simons Foundation
- Technische Universität Dresden
- United States Air Force
- Weizmann Institute of Science