Enhanced Out-of-Plane Conductivity and Photovoltaic Performance in n = 1 Layered Perovskites through Organic Cation Design
Year: 2018
Type: article
Abstract: Layered perovskites with the formula (R–NH 3 ) 2 PbI 4 have excellent environmental stability but poor photovoltaic function due to the preferential orientation of the semiconducting layer parallel to the substrate and the typically insulating nature of the R–NH 3 + cation. Here, we report a series of these n = 1 layered perovskites with the form (aromatic- O -linker-NH 3 ) 2 PbI 4 where the aromatic moiety is naphthalene, pyrene, or perylene and the linker is ethyl, propyl, or butyl. These materials achieve enhanced conductivity perpendicular to the inorganic layers due to better energy level matching between the inorganic layers and organic galleries. The enhanced conductivity and visible absorption of these materials led to a champion power conversion efficiency of 1.38%, which is the highest value reported for any n = 1 layered perovskite, and it is an order of magnitude higher efficiency than any other n = 1 layered perovskite oriented with layers parallel to the substrate. These findings demonstrate the importance of leveraging the electronic character of the organic cation to improve optoelectronic properties and thus the photovoltaic performance of these chemically stable low n layered perovskites.
DOI: 10.1021/jacs.8b03659
Institution: Northwestern University
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
Funders: National Science Foundation, U.S. Department of Defense, U.S. Department of Energy, W. M. Keck Foundation, Northwestern University, Office of Science, Materials Research Science and Engineering Center, Harvard University, National Defense Science and Engineering Graduate, International Institute for Nanotechnology, Northwestern University, Materials Research Science and Engineering Center, Northwestern University, Division of Materials Research, Division of Electrical, Communications and Cyber Systems, Basic Energy Sciences, Air Force Office of Scientific Research
Awards: G1031432798, G1169090945, G1276186940, G205123881, G222768804, NANOENGINEERING OF COMPLEX MATERIALS SUPRAMOLECULAR OBJECTS HYBRIDS AND BIOHYBRIDS, G336680401, G3454132534, G4285583887, G4289625387, G449055007, MRSEC: Center for Multifunctional Materials, G4912152698, G5218300437, G541550329, G5648016710, NNCI: Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource, G6101976803, G7791925507, NANOENGINEERING OF COMPLEX MATERIALS, G8073314406, G8230932042
OpenAlex ID: W2805059700