Affiliation:
1. University of Michigan
2. Wuhan University
Abstract
Natural photosynthesis exploited by both plants and bacteria provides
essential energy and chemicals for sustaining life. A photosynthetic
system often comprises antenna complexes (ACs) that absorb incident
sunlight and deliver the molecular excited state energy to a central
reaction center (RC) that converts the energy to charge. Numerous
efforts have been made to mimic natural photosynthesis using organic
materials. However, short-range energy transport due to material
disorder has hindered their success. Here, we demonstrate a
photodetector that mimics this natural architecture. It employs an AC
that exploits exceptionally long-range (
∼
100
µ
m
) Bloch surface wave polariton
propagation that directs the excited states to an organic
heterojunction detector serving as the RC. Exciton–polaritons are
largely immune to localization due to the partial photonic character
of the polariton, which consequently transports energy over
extraordinary distances from its point of origin. Exciton–polaritons
are edge-coupled into an RC that harvests excitation energy by
dissociation into an electron and hole. This device relies on
polariton-to-charge conversion combined with long-range energy
transport for the direct detection of excited states in organic
semiconductors. Our work paves the way for the realization of
large-scale artificial photosynthetic systems comprising integrated
organic photonic and optoelectronic devices with efficient energy
transport and harvesting under ambient conditions.
Funder
Army Research Office
Universal Display
Corporation
Subject
Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials
Cited by
6 articles.
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