Hole transporting material 5, 10, 15-tribenzyl-5H-diindolo[3, 2-a:3',2'-c]-carbazole for efficient optoelectronic applications as an active layer

doi:10.1088/1674-1056/24/2/027801

Abstract In order to explore the novel application of the transparent hole-transporting material 5,10,15-tribenzyl-5H-diindolo[3,2-a:3',2'-c]-carbazole (TBDI), in this article TBDI is used as an active layer but not a buffer layer in a photodetector (PD), organic light-emitting diode (OLED), and organic photovoltaic cell (OPV) for the first time. Firstly, the absorption and emission spectra of a blend layer comprised of TBDI and electron-transporting material bis-(2-methyl-8-quinolinate) 4-phenylphenolate (BAlq) are investigated. Based on the absorption properties, an organic PD with a peak absorption at 320 nm is fabricated, and a relatively-high detectivity of 2.44×10¹¹ cm·Hz^1/2/W under 320-nm illumination is obtained. The TBDI/tris (8-hydroxyquinoline) aluminum (Alq₃) OLED device exhibits a comparable external quantum efficiency and current efficiency to a traditional 4, 4-bis[N-(1-naphthyl)-N-phenyl-amino]biphenyl (α-NPD)/Alq₃ OLED. A C₇₀-based Schottky junction with 5 wt%-TBDI yields a power conversion efficiency of 5.0%, which is much higher than 1.7% for an α -NPD-based junction in the same configuration. These results suggest that TBDI has some promising properties which are in favor of the hole-transporting in Schottky junctions with a low-concentration donor.

Keywords: 5,10,15-tribenzyl-5H-diindolo[3,2-a:3',2'-c]-carbazole photodetector organic light-emitting diode Schottky junction

Received: 09 July 2014
Revised: 01 August 2014
Accepted manuscript online:

PACS:	78.20.-e	(Optical properties of bulk materials and thin films)
	68.35.-p	(Solid surfaces and solid-solid interfaces: structure and energetics)
	73.40.Lq	(Other semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions)
	42.79.Ek	(Solar collectors and concentrators)

Fund: Project supported by the Funding Program for World-Leading Innovative R & D on Science and Technology (FIRST) from JSPS, the Fund from the Science and Technology Commission of Shanghai Municipality, China (Grant Nos. 14DZ2280900 and 14XD1401800), and the Natural Science Foundation of Shanghai (Grant No. 15ZR1416600).

Corresponding Authors: Zhang Jian-Hua
E-mail: jhzhang@shu.edu.cn

Cite this article:

Zheng Yan-Qiong (郑燕琼), William J. Potscavage Jr, Zhang Jian-Hua (张建华), Wei Bin (魏斌), Huang Rong-Juan (黄荣娟) Hole transporting material 5, 10, 15-tribenzyl-5H-diindolo[3, 2-a:3',2'-c]-carbazole for efficient optoelectronic applications as an active layer 2015 Chin. Phys. B 24 027801

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Hole transporting material 5, 10, 15-tribenzyl-5H-diindolo[3, 2-a:3',2'-c]-carbazole for efficient optoelectronic applications as an active layer

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