Organic Deep Ultraviolet Photodetector With Response Peak Focusing on 270 nm Using the Acceptor BAlq

An organic deep ultraviolet (DUV) photodetector (PD) with a response peak at 270 nm was fabricated. NPB and BAlq were employed as electron donor and acceptor, respectively, and polymer PEDOT:PSS was used as the transparent anode. The peak response of 0.14 A/W under illumination of 270-nm light with...

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Bibliographic Details
Published in:IEEE photonics technology letters 2011-12, Vol.23 (23), p.1835-1837
Main Authors: Zhu, Lu, Dai, Qian, Hu, Zuo-fu, Zhang, Xi-qing, Wang, Yong-sheng
Format: Article
Language:English
Subjects:
Absorption
Anodes
BAlq
Conferences
Dark current
deep ultraviolet (DUV)
Fiber optics
Focusing
Lighting
Optical fibers
organic photodetector (OPD)
PEDOT:PSS
Photoconductivity
Photodetectors
Polymers
Transmittance
Ultraviolet
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Summary:An organic deep ultraviolet (DUV) photodetector (PD) with a response peak at 270 nm was fabricated. NPB and BAlq were employed as electron donor and acceptor, respectively, and polymer PEDOT:PSS was used as the transparent anode. The peak response of 0.14 A/W under illumination of 270-nm light with an intensity of 1.35 mW/cm 2 and a detectivity of 8.26×10 11 cmHz 1/2 W -1 at -12 V were achieved, and the corresponding quantum efficiency η reaches 64.3%. The PDs exhibit a low dark current of 8.97×10 -8 A/cm 2 , and the photo-to-dark current ratio is about 2.1×10 3 at -12 V. The realization of DUV detection is attributed to the strong absorption of shorter UV wavelengths of acceptor BAlq and high transmittance of PEDOT:PSS anode in DUV region. The mechanism of harvesting high performance is also discussed in detail.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2011.2170192