Organic donor-acceptor heterojunctions for high performance circularly polarized light detection

Abstract

Development of highly efficient and stable lateral organic circularly polarized light photodetector is a fundamental prerequisite for realization of circularly polarized light integrated applications. However, chiral semiconductors with helical structure are usually found with intrinsically low field-effect mobilities, which becomes a bottleneck for high-performance and multi-wavelength circularly polarized light detection. To address this problem, here we demonstrate a novel strategy to fabricate multi-wavelength circularly polarized light photodetector based on the donor-acceptor heterojunction, where efficient exciton separation enables chiral acceptor layer to provide differentiated concentration of holes to the channel of organic field-effect transistors. Benefitting from the low defect density at the semiconductor/dielectric interface, the photodetectors exhibit excellent stability, enabling current roll-off of about 3–4% over 500 cycles. The photocurrent dissymmetry value and responsivity for circularly polarized light photodetector in air are 0.24 and 0.28 A W−1, respectively. We further demonstrate circularly polarized light communication based on a real-time circularly polarized light detector by decoding the light signal. As the proof-of-concept, the results hold the promise of large-scale circularly polarized light integrated photonic applications.

Optically Programmable Circularly Polarized Photodetector

“…Thus, achieving switchable detection of L-CPL and R-CPL makes it possible to integrate devices with greater response to both left- and right-handed CPL on a wafer. This outcome is an important contribution to the miniaturization and integration of the CPL-based photodetectors. , Besides, the reported CPL detectors mainly use a sole chiral semiconductor ( S or R ) as the response layer for CPL detection, rendering hence the switchable detection of left- and right-handed CPL challenging. − We have to underline that to achieve switchable detection of both L-CPL and R-CPL, the chirality of the CPL-sensitive layer should be tunable.…”

Recent Progress on OrganicNear‐InfraredPhotodetectors: Mechanism, Devices, and Applications†

“…Organic photodiode is also a two‐terminal device [ 26,90‐92 ] (Figure 3b). It has two operating modes, photoconductive (PC) mode and photovoltaic (PV) mode.…”

Semi‐Transparent, Chiral Organic Photodiodes with Incident Direction‐Dependent Selectivity for Circularly Polarized Light

“…[ 28–32 ] Yet, perhaps counterintuitively, opposite signs for g and g abs were found for some materials. [ 33–36 ] It was also found that g can change sign depending on the thickness of the active layer. [ 33 ]…”