Biomass gasification at temperatures below 1300°C yields producer gas with a range of heavy hydrocarbons. These compounds, collectively known as tar, cause fouling and emission problems in equipment using the producer gas. This paper gives an overview of the work performed at the Energy research Centre of The Netherlands (ECN) on tar measurement, tar prevention, tar cracking, and tar removal. Much of the work has been performed in cooperation with partner institutes and industry. Measurement techniques discussed are the tar guideline, solid-phase adsorption (SPA) method, and tar dew point analyzer. On the subject of tar prevention, the effects of operating conditions, fuel composition, and bed materials in fluidized-bed gasifiers are covered. Tar cracking results are presented for catalytic materials, hightemperature treatment, and the use of plasma. ECN research on tar removal involves among others the development of the water-based GASREIP system and the oil-based OLGA technique.
Flexible semi‐transparent organic photovoltaic (OPV) modules were manufactured by roll‐to‐roll slot–die coating of three functional layers [ZnO, photoactive layer, and poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)] and either the screen printing or inkjet printing of the top electrodes. A poly(3‐hexylthiophene):[6,6] phenyl C61‐butyric acid methyl ester (P3HT:PCBM) layer deposited from non‐chlorinated solvents was used as the absorber layer. The modules were realized by slot–die coating of the layers onto a laser‐patterned polyethylene terephthalate/indium‐tin oxide (PET/ITO) substrate, followed by laser structuring of all coated layers. The top electrodes were realized by high‐resolution printing, which, combined with laser patterning of other layers, enables manufacturing of the modules with high geometrical fill factor (92.5 %). The modules have an active area of 156 cm2, and contain 13 serially interconnected cells. Two semitransparent electrodes (ITO from the bottom and PEDOT:PSS/Ag‐grid from the top side) allow the absorption of photons incident from both sides. The performance of the modules was evaluated and compared among the modules by considering the following factors: (i) roll‐to‐roll slot–die coated vs. spin‐coated layers, (ii) inkjet‐printed vs. screen‐printed top electrodes, (iii) top vs. bottom illumination. The demonstrated technology is one of the proven feasible ways towards industrial manufacturing of the OPV modules.
Organic Photovoltaics—Scaling Up Modules with High Geometrical Fill Factor: The cover image demonstrates a flexible semi‐transparent organic photovoltaic (OPV) module manufactured by roll‐to‐roll slot–die coating of functional layers and inkjet printing of the top electrode. One of the biggest challenges towards upscaling and mass production of OPVs is increasing the active area of the modules. Typical slot–die stripe coating provides geometrical fill factors of the modules in the range of 50–75%. In the Full Paper on by Yulia Galagan and colleagues at Holst Centre and Solliance, the authors demonstrate roll‐to‐roll slot–die coated OPV modules from non‐chlorinated solvents including laser patterning of the coated layers combined with very precise printing of the top electrodes. The combination of laser patterning and high‐resolution printing helps achieve geometrical fill factors of >92.5%. The demonstrated technology shows feasibility for industrial manufacturing of OPV modules of high geometrical fill factor.
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