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Cited 19 time in webofscience Cited 19 time in scopus
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Visible-Light-Responsive High-Detectivity Organic Photodetectors with a 1 mu m Thick Active LayerVisible-Light-Responsive High-Detectivity Organic Photodetectors with a 1 μm Thick Active Layer

Other Titles
Visible-Light-Responsive High-Detectivity Organic Photodetectors with a 1 μm Thick Active Layer
Authors
Park, Jong BaekHa, Jong-WoonYoon, Sung CheolLee, ChangjinJung, In HwanHwang, Do-Hoon
Issue Date
Nov-2018
Publisher
AMER CHEMICAL SOC
Keywords
TPD-based polymer; organic photodetector; organic photodiode; low dark current; high responsivity
Citation
ACS APPLIED MATERIALS INTERFACES, v.10, no.44, pp.38294 - 38301
Indexed
SCIE
SCOPUS
Journal Title
ACS APPLIED MATERIALS INTERFACES
Volume
10
Number
44
Start Page
38294
End Page
38301
URI
https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/15915
DOI
10.1021/acsami.8b13550
ISSN
1944-8244
Abstract
Organic photodetectors (OPDs) are attracting attention for use in flexible and portable electronic applications such as image sensors, remote sensing, optical communications, and medical sensors because of their strong photon responsivity in thin films over a broad range of wavelengths. In particular, the efficient photon-to-current conversion of OPDs under visible light allows their use in indirect X-ray detectors using scintillators to convert X-rays to visible light. The polymer poly(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b']-dithiophene-co-5-(2-hexyldecy1)-1,3-bis(6-octylthieno [3,2-b]thiophen-2-yl)-4H-thieno [3,4-c]pyrrole-4,6(5H)-dione) (PBDTT-8ttTPD) shows strong absorption bands in the region of 500-650 nm, as well as high hole mobility, which provides excellent photoresponsivity and photon-to current conversion efficiency. A p-n junction photodetector was fabricated by blending PBDTT-8ttTPD and [6,6]-phenyl C-71 butyric acid methyl ester (PC71BM) and varying the thickness of the active layer (260-1100 nm). The PBDTT-8ttTPD:PC71BM-based OPDs show promising photodetecting properties having a low dark current of 3.72 x 10(-9) A cm(-2) and high responsivity of 0.39 A W-1 because of the well-controlled morphology, high molar absorption coefficient, and excellent carrier mobility of the PBDTT-8ttTPD:PC71BM layer. Consequently, the specific detectivity of the PBDTT-8ttTPD-based OPD devices was 1.13 x 10(13) Jones at -2 V on irradiation with a light-emitting diode (530 nm wavelength) with a power density of 55.6 mu W cm(-2).
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