Dielectric surface-dependent photogating phenomenon in C8-BTBT leading to broad spectral ultraviolet to near-infrared photoresponse and linearly-weighted synaptic phototransistors
- Authors
- Shin, Jihyun; Kim, Somi; Jang, Byung Chul; Yoo, Hocheon
- Issue Date
- Jan-2023
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Interface trap engineering; Photogating effect; Surface energy; Fluoropolymer; Ultra -broadband photodetection; Synaptic devices
- Citation
- DYES AND PIGMENTS, v.208
- Journal Title
- DYES AND PIGMENTS
- Volume
- 208
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/86634
- DOI
- 10.1016/j.dyepig.2022.110882
- ISSN
- 0143-7208
- Abstract
- Conventional organic phototransistors (OPTs) studies focus on the development of organic semiconductor layers to improve the photoresponsive characteristics. However, exploring a desirable dielectric surface is also an important factor in determining these photoresponsive characteristics in OPTs. This study investigates the dielectric surface-dependent broadband photoresponsive behaviors of C8-BTBT phototransistors and simulates optoelectrical artificial synapse behavior with SiO2-based OPT. Photogating effect is observed depending on the trap states between C8-BTBT and various dielectric interfaces: CYTOP, PMMA, Al2O3, and SiO2. No photogating effect is observed in the hydrophobic dielectric based OPTs, whereas shifts of turn-on voltage (Vturn-on) toward positive gate bias are observed in the hydrophilic dielectric based OPTs. The Vturn-on of SiO2-based OPTs is shifted by up to 43 V under 400 nm light irradiation, achieving high sensitivity of >1.74 x 104 A center dot A-1 and detectivity of >2.40 x 1012 Jones. In the hydrophilic dielectric based OPTs, devices are characterized in ultra-broad optical range from the ultraviolet (UV) to near-infrared (NIR). In addition, optoelectrical artificial synaptic simulation with SiO2-based OPT accomplishes a recognition rate of more than 95%, whereas, despite the same semi-conductor, CYTOP-based OPT accomplishes a recognition rate of 0%.
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