Scalable single point power extraction for compact mobile and stand-alone solar harvesting power sources based on fully printed organic photovoltaic modules and efficient high voltage DC/DC conversion

Rafael Garcia Valverde, José A. Villarejo, Markus Hösel, Morten Vesterager Madsen, Roar R. Søndergaard, Mikkel Jørgensen, Frederik C Krebs

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Patterns for fully printed polymer solar cells are presented that inherently enable scaling of the power output with single point electrical energy connection is presented. Connection is made to only one end of the printed foil that can be rolled out for light energy harvesting. The power level is simply increased/decreased by increasing/decreasing the length of the foil with a corresponding increase/decrease in operating voltage. The current flow runs in both directions along the printed foil thus alleviating the need for post process addition of complex busbar topologies. The power conversion takes place in a HVDC–DC converter that is tailored specifically for operation with polymer solar cells by regulation on the input side. The system charges a lithium-polymer battery thus enabling storage of 82 Wh for a printed OPV foil measuring 0.305 m×9 m having a nominal power output of at least 15 W (AM1.5G, 1000 W m−2). As a demonstration we present a scalable fully integrated and compact power unit for mobile applications comprising solar energy harvesting OPV modules, power conversion and storage. Applications possible include electrical charging of mobile devices, illumination using LED lamps and low mechanical power applications such as pumping water.
Original languageEnglish
JournalSolar Energy Materials & Solar Cells
Volume144
Pages (from-to)48–54
ISSN0927-0248
DOIs
Publication statusPublished - 2015

Bibliographical note

This work has been supported by Energinet.dk (Project no. 12144), by the Danish Ministry of Science, Innovation and Higher Education under a Sapere Aude Top Scientist Grant (no.DFF – 1335- 00037A), an Elite Scientist Grant (no.11-116028) and by the Spanish government under the Research Project CONALMA (TEC2011-25852).

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