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6 Apr 2009

Volume 94, Issue 14, Articles (14xxxx)

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Appl. Phys. Lett. 94, 141901 (2009); http://dx.doi.org/10.1063/1.3111813 (3 pages)

G. S. Huang (黄高山), S. Kiravittaya, V. A. Bolaños Quiñones, F. Ding (丁飞), M. Benyoucef, A. Rastelli, Y. F. Mei (梅永丰), and O. G. Schmidt
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Effects of amorphous semiconductor thickness on top gate staggered organic field-effect transistors

J. M. Verilhac, M. Benwadih, S. Altazin, S. Jacob, R. Gwoziecki, R. Coppard, and C. Serbutoviez

Appl. Phys. Lett. 94, 143301 (2009); http://dx.doi.org/10.1063/1.3111446 (3 pages) | Cited 6 times

Online Publication Date: 6 April 2009

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We have investigated the influence of the semiconductor thickness varying by almost two orders of magnitude on the transfer and output characteristics of top gate staggered organic field-effect transistors. We observe that the mobility in the saturation regime is almost constant in the thickness range studied. In contrast, the subthreshold slope and the threshold voltage are highly impacted by the semiconductor thickness, and in particular they showed a common optimum thickness value. On both sides of this optimum we observe a loss in performances, which are tentatively attributed to different mechanisms.
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85.30.Tv Field effect devices
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Cascade-energy-level alignment based organic photovoltaic cells by utilizing copper phthalocyanine as bipolar carrier transporting layer

Guang Zhang, Wenlian Li, Bei Chu, Lili Chen, Fei Yan, Jianzhuo Zhu, Yiren Chen, and C. S. Lee

Appl. Phys. Lett. 94, 143302 (2009); http://dx.doi.org/10.1063/1.3114379 (3 pages) | Cited 9 times

Online Publication Date: 6 April 2009

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We demonstrate a cascade-energy-level alignment based organic photovoltaic cell by using stacking three materials with appropriate energy levels. A cell with a structure of ITO/4,4′,4″-tris[N,(3-methylphenyl)-N-phenylamino]-triphenylamine (m-MTDATA)/copper phthalocyanine (CuPc)/fullerene (C60)/4,4′-N,N′-dicarubreneazolebiphenyl (BCP)/LiF/Al was shown to have a power efficiency enhancement in more than 30% over that of a standard reference cell (ITO/CuPc/C60/BCP/LiF/Al), which has only one exciton-dissociation interface. The efficiency improvement was mainly ascribed to the ingenious cascade-energy-level alignment and the application of the bipolar carrier transporting property.
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84.60.Jt Photoelectric conversion
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Field dependent and high light sensitive organic phototransistors based on linear asymmetric organic semiconductor

Yunlong Guo, Chunyan Du, Chong-an Di, Jian Zheng, Xiangnan Sun, Yugeng Wen, Lei Zhang, Weiping Wu, Gui Yu, and Yunqi Liu

Appl. Phys. Lett. 94, 143303 (2009); http://dx.doi.org/10.1063/1.3115794 (3 pages) | Cited 15 times

Online Publication Date: 6 April 2009

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The authors reported organic phototransistors (PTs) with octadecyltrichlorosilane treated SiO2/Si substrate based on anthra[2,3-b]benzo[d]thiophene. The organic PTs show a high mobility of 0.4 cm2 V−1 s−1, a maximum photoresponsivity of about 1000 A/W, and photocurrent/dark-current ratio of around 800 under white light irradiation with 30 μW/cm2. The data are comparable with those of PTs based on amorphous silicon. Meanwhile, it is interesting to see that the devices show a high air-stable property and high photosensitivity via electric-field enhanced process. All these phenomena were attributed to the intrinsic optic-electronic property of the organic semiconductor and optic-electric field effect.
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85.60.Dw Photodiodes; phototransistors; photoresistors
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Improvement of subthreshold current transport by contact interface modification in p-type organic field-effect transistors

Masataka Kano, Takeo Minari, and Kazuhito Tsukagoshi

Appl. Phys. Lett. 94, 143304 (2009); http://dx.doi.org/10.1063/1.3115826 (3 pages) | Cited 32 times

Online Publication Date: 6 April 2009

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The charge injection efficiency of organic field-effect transistors (OFETs) is found to be a critical factor determining the subthreshold characteristics of these devices. OFETs fabricated using a wide band gap organic semiconductor and gold source/drain contacts display large threshold voltage and poor subthreshold characteristics. Insertion of a metal-oxide charge injection layer at the contact/semiconductor interface lower the injection barrier height, resulting in marked improvements in threshold voltage and subthreshold slope and strong suppression of the short-channel effect. The improved subthreshold characteristics are attributed to enhanced charge injection and the consequent promotion of charge accumulation.
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85.30.Tv Field effect devices
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Single-crystal-like organic heterojunction with 40 nm thick charge accumulation layers

Feng Zhu, Jianbing Yang, De Song, Chunhong Li, and Donghang Yan

Appl. Phys. Lett. 94, 143305 (2009); http://dx.doi.org/10.1063/1.3118581 (3 pages) | Cited 17 times

Online Publication Date: 10 April 2009

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Single-crystal-like organic heterojunction films of copper phthalocyanine (CuPc) and copper-hexadecafluoro-phthalocyanine (F16CuPc) were fabricated by weak-epitaxy-growth method. The intrinsic properties of organic heterojunction were revealed through threshold voltage shift of field-effect transistors and measurement of single-crystal-like diodes. At both sides of the heterojunction interface 40 nm thick charge accumulation layers formed, which showed that the long carriers’ diffusion length is due to the high crystallinity and low density of deep bulk traps of single-crystal-like films. This also indicated the electronic properties of organic heterojunction can be adjusted by controlling the growth condition.
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73.40.Lq Other semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions
68.55.ag Semiconductors
85.30.Kk Junction diodes
72.20.Jv Charge carriers: generation, recombination, lifetime, and trapping
85.30.Tv Field effect devices
73.61.Ph Polymers; organic compounds
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