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Highly Sensitive Organic Photoconductor Using BoronSub-2,3-naphthalocyanine as a Red-sensitive Film for Stack-type ImageSensors

Published online by Cambridge University Press:  28 December 2015

Toshikatsu Sakai ,
Hokuto Seo ,
Tomomi Takagi  and
Hiroshi Ohtake
Toshikatsu Sakai*
Affiliation:
NHK Science and Technology Research Laboratories, 1-10-15 Kinuta, Setagaya-ku, Tokyo, Japan.
Hokuto Seo
Affiliation:
NHK Science and Technology Research Laboratories, 1-10-15 Kinuta, Setagaya-ku, Tokyo, Japan.
Tomomi Takagi
Affiliation:
NHK Science and Technology Research Laboratories, 1-10-15 Kinuta, Setagaya-ku, Tokyo, Japan.
Hiroshi Ohtake
Affiliation:
NHK Science and Technology Research Laboratories, 1-10-15 Kinuta, Setagaya-ku, Tokyo, Japan.
*
*(Email: sakai.t-ka@nhk.or.jp)
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Abstract

Boron sub-2,3-naphthalocyanine chloride (SubNc) was investigated as a potentialred-sensitive organic photoconductive film (OPF). A photoconductive cell wasfabricated, and its current–voltage characteristics, both with andwithout light irradiation, and external quantum efficiency (EQE) weredetermined. The structure of the photoconductive cell was as follows, withthicknesses in nm given in parentheses: glasssubstrate/In–Zn–O (100)/spiro-2CBP (30)/SubNc(50)/Alq3 (30)/Al (50) (spiro-2CBP =2,7-bis(carbazol-9-yl)-9,9-spirobifluorene; Alq3 =tris(8-hydroxyquinolinato)aluminum). The spiro-2CBP and Alq3 layerswere inserted between the SubNc layer and the electrodes to block dark currentinjection. The three organic layers were successively deposited by evaporationin a vacuum on the In–Zn–O-patterned substrate. SubNc filmabsorbed light in the red region well, with an absorption peak at 695 nm. TheEQE of the cell reached 80% when the applied bias was 15 V. In addition, theblocking layers effectively suppressed dark current in the OPF, whichcorresponded to a current density of 20 nA/cm2 at 15 V. These resultsindicate that SubNc is a promising candidate as a red-sensitive OPF.

Keywords

photoconductivityorganicsensor

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Type
Articles
Information
MRS Advances , Volume 1 , Issue 7: Electronics and Photonics , 2016 , pp. 459 - 464
Copyright
Copyright © Materials Research Society 2015 

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