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11 Jun 2012

Volume 100, Issue 24, Articles (24xxxx)

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Appl. Phys. Lett. 100, 241101 (2012); http://dx.doi.org/10.1063/1.4724309 (3 pages)

Miriam S. Vitiello, Leonardo Viti, Lorenzo Romeo, Daniele Ercolani, G. Scalari, J. Faist, F. Beltram, L. Sorba, and A. Tredicucci
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Energy band bending induced charge accumulation at fullerene/bathocuproine heterojunction interface

Shenghao Wang, Takeaki Sakurai, Ryusuke Kuroda, and Katsuhiro Akimoto

Appl. Phys. Lett. 100, 243301 (2012); http://dx.doi.org/10.1063/1.4728996 (4 pages) | Cited 4 times

Online Publication Date: 12 June 2012

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The electronic properties of fullerene (C60)/bathocuproine (BCP)/Ag heterostructures were studied as a function of the BCP layer thickness by photoemission spectroscopy. For the thin BCP layer, the energy levels are flat and gap states exist at the interface. In contrast, energy band bending occurs at the C60/BCP interface when the BCP layer is thick, resulting in a considerable barrier for electron transport and therefore causing charge accumulation in organic solar cells. The results reveal that a thin BCP layer gives a much more favorable energy level structure and conform that charge accumulation is responsible to the anomalous current-voltage (I-V) curve.
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73.40.Ns Metal-nonmetal contacts
79.60.Jv Interfaces; heterostructures; nanostructures
88.40.jr Organic photovoltaics
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Very high open-circuit voltage of 5.89 V in organic solar cells with 10-fold-tandem structure

Ye Zou, Zhenbo Deng, William J. Potscavage, Masaya Hirade, Yanqiong Zheng, and Chihaya Adachi

Appl. Phys. Lett. 100, 243302 (2012); http://dx.doi.org/10.1063/1.4729009 (4 pages) | Cited 4 times

Online Publication Date: 12 June 2012

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Organic solar cells (OSCs) based on chloroaluminum phthalocyanine (ClAlPc) as donor and fullerene C60 as acceptor with a multi-tandem structure were fabricated. We demonstrated very high open-circuit voltage (VOC) and enhanced power conversion efficiency (PCE) for the multi-tandem OSCs. Using a fivefold structure, we obtained PCE of 2.49% with a VOC of 3.50 V, in comparison with PCE of ∼2% and VOC of 0.72–0.81 V for the single device. We also fabricated a tenfold-stacked OSC showing an extremely high VOC of 5.89 V. The multi-tandem OSCs with very high VOC have great potential for applications in limited-area low-power electronics.
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88.40.jr Organic photovoltaics
88.40.hj Efficiency and performance of solar cells
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High performance dye-sensitized solar cell based on hydrothermally deposited multiwall carbon nanotube counter electrode

Sumeth Siriroj, Samuk Pimanpang, Madsakorn Towannang, Wasan Maiaugree, Santi Phumying, Wirat Jarernboon, and Vittaya Amornkitbamrung

Appl. Phys. Lett. 100, 243303 (2012); http://dx.doi.org/10.1063/1.4726177 (4 pages) | Cited 1 time

Online Publication Date: 12 June 2012

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Conductive glass was coated with multiwall carbon nanotubes (MWCNTs) by a hydrothermal method. MWCNTs films were subsequently used as dye-sensitized solar cell (DSSC) counter electrodes. The performance of hydrothermal MWCNT DSSC was ∼2.37%. After film annealing in an Ar atmosphere, annealed-hydrothermal MWCNT (AHT-CNT) DSSC efficiency was significantly increased to ∼7.66%, in comparison to ∼8.01% for sputtered-Pt DSSC. Improvement of AHT-CNT DSSC performance is attributed to a decrease in charge-transfer resistance from 1500 Ω to 30 Ω as observed by electrochemical impedance spectroscopy.
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88.40.H- Solar cells (photovoltaics)
88.40.J- Types of solar cells
82.45.Fk Electrodes
81.15.Aa Theory and models of film growth
61.72.Cc Kinetics of defect formation and annealing
81.40.Ef Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization
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