Issue 44, 2020

n-Channel organic phototransistors with an n-type conjugated polymer based on indacenodithiophene and naphthalenediimide units

Abstract

Here we report n-channel organic phototransistors (OPTRs) with a soluble n-type conjugated polymer, as a sensing channel layer, poly(5,5,11,11-tetrakis(5-(2-ethylhexyl)thiophene-2-yl)-dithieno[2,3-d:2′,3′-d′]-s-indaceno[1,2-b:5,6-b′]dithiophene)-co-2,7-bis(2-octyldodecyl)benzo[lmn][3,8]phenanthroline-1,3,6,8(2H,7H)-tetraone (PIDTT-NDI). The PIDTT-NDI polymer was synthesized by polymerization of the corresponding IDTT and NDI monomers via the Stille coupling reaction. The PIDTT-NDI films exhibited an optical absorption edge of ca. 900 nm and the lowest unoccupied molecular orbital (LUMO) energy of ca. −4.2 eV. The organic field-effect transistors (OFETs) with the PIDTT-NDI channel layers showed n-channel transistor behaviors and their best performances in the dark were measured at the PIDTT-NDI thickness of t = 70 nm. The photosensing test disclosed that the OPTRs with the PIDTT-NDI sensing channel layers could detect both blue (434 nm) and near infrared (754 nm) light irrespective of the PIDTT-NDI thickness, even though the best photoresponsivity (RC) was achieved at t = 70 nm. The flexible OPTRs with the 70 nm-thick PIDTT-NDI sensing channel layers, which were fabricated using poly(ethylene naphthalene) (PEN) film substrates, could detect both blue (420 nm) and deep red (700 nm) light. The present, flexible PIDTT-NDI-based OPTRs are expected to be applied for the skin therapy systems which need the blue (400–420 nm) and red (620–700 nm) light for the acne and anti-aging treatments, respectively.

Graphical abstract: n-Channel organic phototransistors with an n-type conjugated polymer based on indacenodithiophene and naphthalenediimide units

Supplementary files

Article information

Article type
Paper
Submitted
22 May 2020
Accepted
15 Sep 2020
First published
17 Sep 2020

J. Mater. Chem. C, 2020,8, 15778-15787

n-Channel organic phototransistors with an n-type conjugated polymer based on indacenodithiophene and naphthalenediimide units

S. Lee, C. Lee, H. Kim and Y. Kim, J. Mater. Chem. C, 2020, 8, 15778 DOI: 10.1039/D0TC02456B

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