One of the most popular approaches to improve the performance of organic photonic devices has been to control the electrically heterogeneous charge-transferring interfaces via chemical modifications. Despite intense research efforts, however, the rapid pace of material evolution through the chemical versatility of the organic compound allows only limited room for the fine-tuning of the interfaces exclusive to specific materials. This limitation leads to an ill-controlled charge recombination behavior that relies solely on the inherent characteristics of each material; thus, the common device architecture cannot harness its full potential. In this work, we demonstrate the use of a graphene-organic hybrid barristor-type phototriode architecture as an alternative platform to realize a linearly and highly photosensitive photodetector operating in a broad dynamic range with rapid temporal responses. With the capability of interfacial energetic modulation, our model system exhibits the dominance of swiftly saturable and slowly responding "cold"traps (TC < 3kT) in charge recombination behaviors, leading to a broad linear dynamic range of 110 dB as well as unconventional illumination-driven increments of both D∗ and R up to 1013 Jones and 360 mA/W, respectively, that surpass the best-reported organic photodiodes. Our findings demonstrate that the organic-graphene hybrid photonic barristor architecture can open new avenues to design high-performance photodetectors for various photonic applications in the future.
Bibliographical noteFunding Information:
This study was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT), the Basic Science Research Program through the NRF funded by the Ministry of Education (2020R1A2C2007819 and 2020R1A6A3A01098863), and the Creative Materials Discovery Program (NRF-2019M3D1A1078299) through the NRF funded by the Ministry of Science and ICT, Korea.
© 2021 American Chemical Society.
All Science Journal Classification (ASJC) codes
- Colloid and Surface Chemistry