Open AccessHigh-performance circular-polarization-sensitive organic photodetectors based on a chiral plasmonic nanocavity
Author(s) -
Hyungchae Kim,
Kyung Ryoul Park,
Changsoon Kim
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.383206
Subject(s) - photodetector , optoelectronics , plasmon , photoactive layer , circular polarization , dichroic glass , photocurrent , optics , photonics , materials science , quantum efficiency , polarization (electrochemistry) , physics , energy conversion efficiency , chemistry , polymer solar cell , microstrip
Chiral photodetectors, optoelectronic devices that can detect circularly polarized light (CPL), have attracted much attention as building blocks of next-generation information technology. However, their performance has been severely limited by the tradeoff between the external quantum efficiency (η E ) and the dissymmetry factor of photocurrent, the latter typically being limited by the small dissymmetry factor of absorption (g A ). This work numerically demonstrates that a circular polarization-sensitive organic photodetector (CP-OPD) based on a chiral plasmonic nanocavity can achieve both high η E and g A . The design of the chiral nanocavity, featuring a circular dichroic plasmonic mode with a high photonic density of states in the subwavelength thick photoactive layer, is decoupled with that of the photoactive layer, which enables the independent control of the circular dichroic and photon-to-charge conversion properties. By investigating the interaction between CPL and the molecules constituting the photoactive layer, a design principle of the plasmonic CP-OPD is established, resulting in superior performance with η E = 23.8 % and g A = 1.6.