Phenylquinoline Derivatives as Efficient Interfacial Layer Materials for High‐Performance Organic Electronic Devices. (4th July 2016)

• Record Type: Journal Article
• Authors: Gunasekar, Kumarasamy; Cho, Woosum; Long, Dang Xuan; Reddy, Saripally Sudhaker; Song, Myungkwan; Noh, Yong‐Young; Jin, Sung‐Ho
• Is Part Of: Advanced Electronic Materials. Volume 2:Number 8(2016)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2016-07-04
• Subjects: interfacial layers -- organic photovoltaic cells -- organic thin‐film transistors -- metal oxide thin‐film transistors -- phenylquinoline; Materials -- Electric properties -- Periodicals; Materials science -- Periodicals; Magnetic materials -- Periodicals; Electronic apparatus and appliances -- Periodicals; 537
• DOI: 10.1002/aelm.201600086
• Languages: English
• ISSNs: 2199-160X

Abstract

Abstract : Thin film electronic and optoelectronic devices demand electrodes with a work function ( Φ ) that is sufficiently low to facilitate the transport of electrons in and out of the lowest unoccupied molecular orbital of a given semiconductor. Herein, phenothiazine‐, carbazole‐, and fluorene‐based phenylquinoline derivatives as efficient interfacial layer (IL) materials for solution‐processable organic and metal oxide electronic devices are reported. The IL is applied on top of a charge injection electrode in various solution‐processed devices, including n‐channel organic thin‐film transistors (OTFTs) with [6, 6]‐phenyl C71 ‐butyric acid methyl ester (PC71 BM) and poly[N, N′‐ bis (2‐octyldodecyl)‐naphthalene‐1, 4:5, 8‐ bis (dicarboximide)‐2, 6‐diyl]‐alt‐5, 5′‐(2, 2′‐bithiophene) [P(NDI2OD‐T2)] and amorphous indium gallium zinc oxide (IGZO) transistors, and also in organic photovoltaics (OPVs). Both PC71 BM‐ and P(NDI2OD‐T2)‐based n‐channel OTFTs with IL show enhanced mobility by more than 200% compared to bare Au electrode. IGZO transistors showed much improved mobility of 15.3 cm 2 V −1 s −1 with an IL compared to bare Au (0.6 cm 2 V −1 s −1 ) device. A significantly improved power conversion efficiency (PCE) of 7.63% is obtained for IL utilizing the poly[4, 8‐ bis [(2‐ethylhexyl)oxy]benzo[1, 2‐b:4, 5‐b′]dithiophene‐2, 6‐diyl][3‐fluoro‐2‐[(2‐ethylhexyl)carbonyl]thieno[3, 4‐b]‐thiophenediyl] (PTB7):PC71 BM based OPVs compared to 4.75% of control device. Ultraviolet photoelectron spectroscopy study reveals that phenylquinoline derivatives significantly lower the Φ of Au, thus facilitating electron injection/extraction in the device. Abstract : Highly efficient phenothiazine‐, carbazole‐, and fluorene‐based phenylquinoline derivatives are introduced as interfacial layer materials in metal oxide and organic thin‐film transistors as well as in organic photovoltaic cells. Ultraviolet photoelectron spectroscopy studies reveal that phenylquinoline derivatives significantly lower the work function of Au as well as indium tin oxide, and facilitate electron injection and extraction in the devices.