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Linear absorption measurements, current-voltage characteristics, and time-resolved microwave conductivity measurements were utilized to investigate the impact of molecular aggregation of a novel donor material on photovoltaic device efficiency. We report efficiencies of 2.4+/−0.3% and explain the increase in short-circuit current and efficiency as a function of the increased aggregation.
So-called organic photovoltaic devices have seen certified power conversion efficiencies increase from 2.5% in 2001[1] to 8.3% in 2011[2]. Close inspection of the strategies employed to realize this impressive improvement in performance reveal a common approach of synthesizing new donor polymers and molecules, fullerene acceptors and, in some cases, new device architectures. It is questionable as...
As organic photovoltaic (OPV) devices have begun to move toward initial applications, issues of their stability are becoming increasingly important. The de facto standard OPV devices are made from a blend of poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C61-butyric acid methyl ester (PCBM), and these serve as a test bed for lifetime testing. Delamination, oxidation, and chemical interactions at the...
Transparent and electrically conductive coatings and films have a variety of uses in the fast-growing field of optoelectronic applications. Transparent electrodes typically include semiconductive metal oxides such as indium tin oxide (ITO), and conducting polymers such as poly(3,4-ethylenedioxythiophene), doped and stabilized with poly(styrenesulfonate) (PEDOT/PSS). In recent years, Eikos, Inc. has...
We report two organic excitonic solar cell structures with the conventional ITO anode replaced by a thin single-walled carbon nanotube (SWCNT) layer. The first structure, SWCNT/PEDOT/P3HT:PCBM/Al, gave a non-optimized device efficiency of 2.61%, which is competitive with ITO-based devices. The second, SWCNT/P3HT:PCBM/Al, is unique, as it did not use PEDOT as a hole selective contact. This had a promising...
We present a new thin-film solar cell structure in which the traditional transparent conductive oxide electrode (ZnO) is replaced by a transparent conductive coating consisting of a network of bundled single-wall carbon nanotubes. Optical transmission properties of these coatings are presented in relation to their electrical properties (sheet resistance), along with preliminary solar cell results...
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