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Proceedings Paper

Photovoltaic energy harvesting for smart sensor systems
Author(s): Martin Kasemann; Karola Rühle; Karim M. Gad; Stefan W. Glunz
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Paper Abstract

Commercial photovoltaic cells used in energy harvesting applications suffer from low power conversion efficiencies at low light intensities. Typical efficiencies are in the range of 2 to 5% at 100 Lux. This is because the cells are typically optimized and specified with respect to the AM 1.5 sun spectrum at 1000 W/m2 light intensity, which is far away from the required operating range. This paper infers design rules for photovoltaic cells with special attention to the low intensity range. It discusses the major parameters for the optimization of photovoltaic cell for different material classes like crystalline silicon, amorphous silicon and III-V materials. Measurement results for an optimized silicon cell with more than 15% efficiency at 100 Lux are presented.

Paper Details

Date Published: 17 May 2013
PDF: 6 pages
Proc. SPIE 8763, Smart Sensors, Actuators, and MEMS VI, 87631T (17 May 2013); doi: 10.1117/12.2018052
Show Author Affiliations
Martin Kasemann, Univ. of Freiburg (Germany)
Karola Rühle, Univ. of Freiburg (Germany)
Fraunhofer-Institute for Solar Energy Systems (Germany)
Karim M. Gad, Univ. of Freiburg (Germany)
Stefan W. Glunz, Fraunhofer-Institute for Solar Energy Systems (Germany)

Published in SPIE Proceedings Vol. 8763:
Smart Sensors, Actuators, and MEMS VI
Ulrich Schmid; José Luis Sánchez de Rojas Aldavero; Monika Leester-Schaedel, Editor(s)

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