Schottky barrier-gated high performance photodetectors using a water-borne polymeric colloid
- Authors
- Cho, J.; Sim, K. M.; Yoon, S.; Ha, J.; Chung, D. S.
- Issue Date
- 2016
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- NANOSCALE, v.8, no.30, pp 14643 - 14649
- Pages
- 7
- Journal Title
- NANOSCALE
- Volume
- 8
- Number
- 30
- Start Page
- 14643
- End Page
- 14649
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/64395
- DOI
- 10.1039/c6nr03949a
- ISSN
- 2040-3364
2040-3372
- Abstract
- Here, we demonstrate the synergetic application of a cationic surfactant (CTAB) for the fabrication of a fast response organic photoconductor via an environmentally benign fabrication process. A water-borne colloid of the semiconducting polymer PBTTT was fabricated via a mini-emulsion process with CTAB as the surfactant, and deposited onto a Au-patterned substrate to complete the photoconductor device geometry. Due to the preferential adsorption of the ammonium cation of the CTAB molecules onto the Au surface, a dipole layer was created and thus the work function of Au was significantly reduced, as confirmed by ultraviolet photoelectron spectroscopic studies. We show that the resulting Schottky barrier between Au-CTAB and PBTTT can be used as an artificial 'gate' for a trap-limited photoconductive mechanism, leading to a fast temporal response of the photoconductor without sacrificing the efficient photoconductive gain-generating mechanism. As a result, a high detectivity of 4.92 x 10(10) Jones, as well as a high gain of 107, can be realized from the PBTTT-based organic photoconductor. This result opens the possibility of fabricating high performance and simple structured organic photodetectors via a nontoxic fabrication process.
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Collections - College of Engineering > School of Chemical Engineering and Material Science > 1. Journal Articles
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