Multi-junction polymer solar cells

We discuss the materials challenges for increasing cell efficiencies of polymer solar cells via the route of stacking several cells on top of each other in multi-junction solar cells. For such cells, the recombination layer between the two sub cells is crucial. Typically, the recombination layer consists of a semi-transparent n- and p-type...

OrgaPVnet: building a realistic roadmap for organic based photovoltaics

Solar cells with active layers, partially or fully based on organic materials, are the subject of large interest, both from R&D-actors as from large investors. This interest is fuelled by the rapid developments in the field of organic based devices with certified efficiencies between 5 and 6% for full-organic devices and 11% for dye...

Fabrication and characterisation of polymer based solar cells

n.a.

Recent advances in dye-sensitized solar cells

This review describes recent advances in the research on dye-sensitized solar cells. After a brief discussion of the general operation principles and a presentation of record efficiencies, stability data and key technology drivers, current trends will be reviewed. The focus of this review is on materials development (sensitizers, nanostructured...

Optical modeling as optimization tool for single and double junction polymer solar cells

We have used optical modeling to calculate whether optical absorption and corresponding current densities in solar cells consisting of PF10TBT:PCBM (1:4) can be enhanced, either in single junctions by applying optical spacers or by going to a tandem structure. The current densities are calculated from the optical absorption using experimentally...

Optical modelling: a powerful tool in the analysis of highly efficient polymer solar cells

n.v.t.

Improving Polymer based Photovoltaic Devices by Reducing the Voltage Loss at the Donor-Acceptor Interface

This paper discusses the characterization and optimization of organic solar cells based on a bulk heterojunction consisting of an alternating copolymer, containing a fluorene and a benzathiadiazole unit with two neighboring thiophene rings, and a fullerene derivative (PCBM). The resulting power conversion efficiency amounts 3.9?İ.2 % (AM1.5, 100...

Determining the internal quantum efficiency of highly efficient polymer solar cells through optical modeling

A power conversion efficiency of 4.2% (AM1.5, 1000 W/M2) is measured for an organic solar cell based on an active layer of an alternating copolymer, containing a fluorence and a benzothadiazole unit with two neighboring thiophene rings, and a fullerene derivative. Using optical modeling, the absorption profile in the active layer of the solar...

Cyclometalated ruthenium complexes for sensitizing nanocrystalline TiO2 solar cells

Cyclometalated ruthenium complexes of [Ru(C^N^N) (N^N^N)] configuration are a promising new class of molecular sensitizers for dye-sensitized solar cells, as a result of their broad and red-shifted visible absorption in comparison to the analogous [Ru(N^N^N)2] type coordinative complexes.

Nanoscale Structure of Solar Cells Based on Pure Conjugated Polymer Blends

This paper gives an overview of the status of photovoltaic devices based on blends of semiconducting polymers. The polymer blends form the bulk heterojunction in these photovoltaic devices. The fundamental mechanisms governing the performance of these devices are discussed as well as the specificities of these all-polymer solar cells. The...

Photovoltaic properties of a conjugated polymer blend of MDMO-PPV and PCNEPV

Photovoltaic properties of solution-processed semiconducting polymer blends have been studied. It is demonstrated that photoinduced charge transfer occurs in binary mixtures of poly[2-methoxy-5-(3,7-dimethyloctyloxy)-1,4-phenylenevinylene] (MDMO-PPV) and poly-[oxa-1,4-phenylene-(1-cyano-1,2-vinylene)-(2-methoxy-5-(3, 7-dimethyloctyloxy)-1,4...

Microstructure characterization of titanium dioxide nanodispersions and thin films for dye-sensitized solar cell devices

Influence of heparin and a low molecular weight heparinoid on specific endogenous and exogenous fibrinolytic factors during rest and exercise

The effects of heparin (5,000 IU i.v.) and the low molecular weight heparinoid Org 10172 (Orgaran) (3,250 anti-Xa units i.v.) on components of the fibrinolytic system were studied in two double-blind, randomised, placebo-controlled, cross-over trials using healthy subjects. In study A (n = 6) the effects were studied during rest and standardized...

Liver blood flow as a majorr determinant of the clearance of recombinant human tissue-type plasminogen activator

The influence of changes in liver blood flow on the clearance of rt-PA was studied both in healthy subjects and in a perfused rat liver model. Liver blood flow in healthy subjects was documented indirectly by the clearance of indocyanine green (ICG). Exercise reduced liver blood flow on average by 57% with a 95% confidence interval (95% CI)...