Long-lived charge separation in two-dimensional ligand-perovskite heterostructures
Abstract
Rational design of heterojunctions using nanostructured materials is a useful strategy for achieving efficient interfacial charge separation in photovoltaics. Heterojunctions can be constructed between the organic ligands and the inorganic layers in two-dimensional perovskites, taking advantage of their highly programmable structures. Here, we investigate charge transfer and recombination at the interface between the thiophene-based semiconducting ligands and the lead halide inorganic sublattices using time-resolved photoluminescence and transient reflection spectroscopy in single two-dimensional perovskite crystals. These measurements demonstrate the charge transfer time around 10 ps and long-lived charge-separated state over the nanosecond time scale in two-dimensional ligand-perovskite heterostructures. The efficient charge transfer processes coupled with slow charge recombination suggest the potential for improving exciton dissociation and charge transport in two-dimensional perovskite solar cells.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jan 27, 2020
- Source ID
- 10.1063/1.5131801
Entities
People
- Enzheng Shi
- Jordan Snaider
- Letian Dou
- Libai Huang
- Linrui Jin
- Richard D. Schaller
- Shibin Deng
- Yao Gao
Organizations
- Argonne National Laboratory
- Northwestern University
- Purdue University
- United States Department of Defense
- United States Department of Energy