Proceedings ArticleDOI
High-efficiency silicon solar cells for low-illumination applications
Stefan W. Glunz,J. Dicker,M. Esterle,Martin Hermle,Joerg Isenberg,F.J. Kamerewerd,J. Knobloch,Daniel Kray,A. Leimenstoll,F. Lutz,D. Osswald,Ralf Preu,Stefan Rein,E. Schaffer,C. Schetter,H. Schmidhuber,H. Schmidt,M. Steuder,C. Vorgrimler,Gerhard Willeke +19 more
- pp 450-453
TLDR
In this article, Fraunhofer ISE extended the fabrication of high-efficiency solar cells from a laboratory scale to a small pilot-line production at a very low illumination level.Abstract:
At Fraunhofer ISE the fabrication of high-efficiency solar cells was extended from a laboratory scale to a small pilot-line production. Primarily, the fabricated cells are used in small high-efficiency modules integrated in prototypes of solar-powered portable electronic devices such as cellular phones, handheld computers etc. Compared to other applications of high-efficiency cells such as solar cars and planes, the illumination densities found in these mainly indoor applications are significantly below 1 sun. Thus, special care was taken to keep the cell efficiency level high even at very low illumination levels. For this reason, particularly the cell border was analyzed and optimized carefully. The excellent cell characteristics achieved at low illumination densities increase the benefit of a solar power supply for such devices by an order of magnitude if compared to standard solar cells.read more
Citations
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Journal ArticleDOI
Maximum efficiencies of indoor photovoltaic devices
TL;DR: In this paper, the authors provided a systematic discussion of the optimum material and efficiency limits of indoor photovoltaics, and the experimental efficiencies of 11 sample groups with a maximum efficiency of 16%, which were measured with a radiometric indoor characterization setup especially developed for this study, support the theoretically predicted changes in efficiency when compared with efficiencies under IEC 60904-3.
Book
Loss analysis of crystalline silicon solar cells using photoconductance and quantum efficiency measurements
TL;DR: In this article, the authors reduced the three-dimensional transport in solar cells with periodically arranged rear point contacts to a one-dimensional calculation and derived an approximation for the series resistance.
Journal ArticleDOI
Design considerations of sub-mW indoor light energy harvesting for wireless sensor systems
TL;DR: Comprehensive design considerations for an indoor light energy harvesting system for building management applications is provided and maximum power point tracking circuits are proposed which significantly increase the power obtained from the solar cells.
Journal ArticleDOI
Influence of Defects on Solar Cell Characteristics
TL;DR: In this article, the authors reviewed the present knowledge of the origin of non-ideal I-V characteristics of silicon solar cells and introduced new results on recombination involving coupled defect levels.
Journal ArticleDOI
Efficient kesterite solar cells with high open-circuit voltage for applications in powering distributed devices
TL;DR: Antunez et al. as mentioned in this paper presented a multistep process to simultaneously optimize the conversion efficiency and voltage over a wide range of light intensities appropriate for small-scale, distributed and indoor applications.
References
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Journal ArticleDOI
Numerical quantification and minimization of perimeter losses in high‐efficiency silicon solar cells
Proceedings ArticleDOI
Effects of pn-junctions bordering on surfaces investigated by means of 2D-modeling
R. Kuhn,Peter Fath,Ernst Bucher +2 more
TL;DR: In this article, a two-dimensional modeling of the recombination mechanism occurring in such device regions is presented, showing that a poor quality of the surface passivation near to where the pn-junction borders, is mainly responsible for the observed losses in fill factor and open-circuit voltages.
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Effects of pn-junctions bordering on surfaces investigated by means of 2D-modeling
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