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26 Sep 2011

Volume 99, Issue 13, Articles (13xxxx)

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Appl. Phys. Lett. 99, 131101 (2011); http://dx.doi.org/10.1063/1.3641907 (3 pages)

Linas Minkevičius, Vincas Tamošiūnas, Irmantas Kašalynas, Dalius Seliuta, Gintaras Valušis, Alvydas Lisauskas, Sebastian Boppel, Hartmut G. Roskos, and Klaus Köhler
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Doping-based control of the energetic structure of photovoltaic co-deposited films

Norihiro Ishiyama, Masayuki Kubo, Toshihiko Kaji, and Masahiro Hiramoto

Appl. Phys. Lett. 99, 133301 (2011); http://dx.doi.org/10.1063/1.3643045 (3 pages) | Cited 4 times

Online Publication Date: 26 September 2011

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Control of the energetic structure of photovoltaic co-deposited films consisting of fullerene and α-sexithiophene was demonstrated by ppm-level doping with molybdenum oxide (MoO3). The transition from an n-type Schottky junction via a metal/insulator/metal junction to a p-type Schottky junction by increasing the MoO3 doping concentration was verified by observing the photovoltaic properties. Direct ppm-level doping into photoactive co-deposited films could become a powerful tool for designing the appropriate built-in potential for efficient organic photovoltaic cells.
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73.21.-b Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems
73.30.+y Surface double layers, Schottky barriers, and work functions
73.40.Rw Metal-insulator-metal structures
73.50.Pz Photoconduction and photovoltaic effects
72.40.+w Photoconduction and photovoltaic effects
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Increased efficiency of low band gap polymer solar cells at elevated temperature and its origins

Bin Yang, James Cox, Yongbo Yuan, Fawen Guo, and Jinsong Huang

Appl. Phys. Lett. 99, 133302 (2011); http://dx.doi.org/10.1063/1.3643450 (3 pages) | Cited 8 times

Online Publication Date: 30 September 2011

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Photovoltaic characteristics of a low bandgap polymer, poly[(4,4′-bis(2-lethylhexyl)dithieno-[3,2-b:2′,3′-d]silole)-2,6-diyl-alt-(2,1,3-benzothiadiazole)-4,7-diyl], based bulk hetero-junction organic photovoltaic were investigated from room temperature (RT) to 145 °C to evaluate its applications in harsh environments. The power conversion efficiency was found to increase from 4.1% at RT to 4.5% at 105 °C with increased short circuit current density (Jsc) and fill factor (FF) despite the decreased open circuit voltage (Voc). Detailed investigation revealed that Jsc and FF improvements were caused by the increased and balanced carrier mobilities at higher temperatures. The Voc of the low bandgap polymer solar cell is determined not only by the energy levels and dark currents, but also by the binding energy of charge transfer excitons (CTEs). A slower reduction of Voc is observed at high temperatures due to the decreased binding energy of CTEs.
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88.40.jr Organic photovoltaics
88.40.H- Solar cells (photovoltaics)
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