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3 Aug 2009

Volume 95, Issue 5, Articles (05xxxx)

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Appl. Phys. Lett. 95, 052901 (2009); http://dx.doi.org/10.1063/1.3190518 (3 pages)

Didit Yudistira, Sarah Benchabane, Davide Janner, and Valerio Pruneri
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Electron injection via pentacene thin films for efficient inverted organic light-emitting diodes

Changhun Yun, Hyunsu Cho, Hyeseung Kang, Young Mi Lee, Yongsup Park, and Seunghyup Yoo

Appl. Phys. Lett. 95, 053301 (2009); http://dx.doi.org/10.1063/1.3192361 (3 pages) | Cited 16 times

Online Publication Date: 4 August 2009

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We report on the fabrication of efficient inverted organic light-emitting diodes (IOLEDs) using pentacene films as an electron injection/transport layer between Al and Alq3 layers. These IOLED devices turn on at 4.7 V and exhibit a luminous efficiency of 9.5 cd/A without any dopants or reactive metals. Analysis using space-charge-limited characteristics of electron-only devices and ultraviolet photoelectron spectroscopy measurement of metal/organic interfaces indicates that the efficient IOLED characteristics can be attributed partly to the electron mobility of pentacene that is 102–104 times larger than that of Alq3 and to the effective reduction in injection barrier at contacts.
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85.60.Jb Light-emitting devices
73.50.Dn Low-field transport and mobility; piezoresistance
73.50.Fq High-field and nonlinear effects
73.61.Ph Polymers; organic compounds
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Arrangement of band structure for organic-inorganic photovoltaics embedded with silicon nanowire arrays grown on indium tin oxide glass

Cheng Yung Kuo and Chie Gau

Appl. Phys. Lett. 95, 053302 (2009); http://dx.doi.org/10.1063/1.3189088 (3 pages) | Cited 17 times

Online Publication Date: 4 August 2009

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Silicon nanowires (SiNWs) arrays grown vertically on an indium tin oxide glass substrate by the vapor liquid solid process are covered with poly (3-hexylthiophene) (P3HT) mixed with [6,6]-phenyl-C60-butyric acid methyl ester (PCBM) to make into a hybrid solar cell. With proper control of the nanowire size and arrangement of the band structure suitable for charge carrier transport, the P3HT/SiNWs solar cell can have a much better energy conversion efficiency than the P3HT+PCBM solar cell. Poor band structure arrangement can lead to band barrier and enhanced electron-hole pair recombination and much lower efficiency even with more light absorption.
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84.60.Jt Photoelectric conversion
81.07.Pr Organic-inorganic hybrid nanostructures
81.07.Vb Quantum wires
73.50.Gr Charge carriers: generation, recombination, lifetime, trapping, mean free paths
73.50.Pz Photoconduction and photovoltaic effects
73.21.Hb Quantum wires
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Semitransparent inverted polymer solar cells with MoO3/Ag/MoO3 as transparent electrode

Chen Tao, Guohua Xie, Caixia Liu, Xindong Zhang, Wei Dong, Fanxu Meng, Xiangzi Kong, Liang Shen, Shengping Ruan, and Weiyou Chen

Appl. Phys. Lett. 95, 053303 (2009); http://dx.doi.org/10.1063/1.3196763 (3 pages) | Cited 14 times

Online Publication Date: 4 August 2009

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Semitransparent inverted polymer solar cells were developed using thermally evaporable MoO3/Ag/MoO3 as transparent anode. The ultrathin inner MoO3 layer was introduced as a buffer layer to improve hole collection, while the outer MoO3 layer served as a light coupling layer to enhance optical transmittance of the device. The dependence of the device performances on the thickness of the outer MoO3 layer was investigated. The results showed that the addition of the outer MoO3 layer improves the transmittance of the anode compared to MoO3/Ag anode and the performances of the semitransparent devices with the outer MoO3 layer are improved due to the reduced series resistance.
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84.60.Jt Photoelectric conversion
82.45.Fk Electrodes
82.45.Mp Thin layers, films, monolayers, membranes
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Organic light-emitting diode with liquid emitting layer

Denghui Xu and Chihaya Adachi

Appl. Phys. Lett. 95, 053304 (2009); http://dx.doi.org/10.1063/1.3200947 (3 pages) | Cited 11 times

Online Publication Date: 6 August 2009

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We demonstrate an original organic light-emitting diode (OLED) having a neat liquid host of 9-(2-ethylhexyl)carbazole (EHCz) doped with a guest emitter of 5,6,11,12-tetraphenylnapthacene (rubrene). The device structure is composed of indium tin-oxide (ITO)/poly(3,4-ethylenedioxythiophene):poly(styrenesulphonate)/EHCz:rubrene/Cs2CO3/ITO. We demonstrate that the liquid organic semiconducting layer surely transports charge carriers, leading to electroluminescence from rubrene with the highest external quantum efficiency of ηext = 0.03% at a current density of 0.26 mA/cm2. Our demonstration of the liquid-OLEDs will open another possibility of organic semiconductors and light-emitting applications.
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85.60.Jb Light-emitting devices
81.05.Hd Other semiconductors
81.05.Lg Polymers and plastics; rubber; synthetic and natural fibers; organometallic and organic materials
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