Details
| Original language | English |
|---|---|
| Pages (from-to) | 175-183 |
| Number of pages | 9 |
| Journal | Solar Energy Materials and Solar Cells |
| Volume | 186 |
| Early online date | 30 Jun 2018 |
| Publication status | Published - Nov 2018 |
| Externally published | Yes |
Abstract
We measure the short circuit current improvement of various commercial backsheets for passivated emitter and rear solar cells (PERC) in photovoltaic (PV) modules. We quantify this improvement by a light recovery factor k defined as the share of the light reflected by the backsheet around the cell in a PV module laminate, which is converted into electrical current by the solar cells in the module relative to a reference rear surface. The presented measurement method allows measuring the light recovery factor as function of the incident light beam angle, which are important for the calculation of the yield analysis in the field. Simulations of the recovery factor with the optical ray tracing program DIADALOS are performed in order to support the interpretation of the results. For measuring the absolute light recovery probability of a backsheet one should use a reference backsheet with an absorbance of close to 100% to avoid systematic reflection errors especially for high incident light beam angles > 50°. The ranking of various recovery factors are compared to the ranking measured by reflectance measurements defined in standard IEC 62788-2 Ed.1 for backsheets. The standard shows a substantial deviation between the ranking of recovery factor and the reflectance which can be corrected by using an adapted definition for the reflectance measurement method.
Keywords
- Backsheet, Light harvesting, Light trapping, Module efficiency, PV module
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Energy(all)
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)
- Surfaces, Coatings and Films
Sustainable Development Goals
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In: Solar Energy Materials and Solar Cells, Vol. 186, 11.2018, p. 175-183.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Measuring the light recovery factor of backsheets in photovoltaic modules
AU - Köntges, Marc
AU - Schulte-Huxel, Henning
AU - Blankemeyer, Susanne
AU - Vogt, Malte R.
AU - Holst, Hendrik
AU - Reineke-Koch, Rolf
N1 - Funding information: We gratefully acknowledge the financial support by the German Federal Ministry for Economic Affairs and Energy under FKZ 0325641 (PERC-2-Module) and by the State of Lower Saxony. We gratefully acknowledge the financial support by the German Federal Ministry for Economic Affairs and Energy under FKZ 0325641 (PERC-2-Module) and by the State of Lower Saxony .
PY - 2018/11
Y1 - 2018/11
N2 - We measure the short circuit current improvement of various commercial backsheets for passivated emitter and rear solar cells (PERC) in photovoltaic (PV) modules. We quantify this improvement by a light recovery factor k defined as the share of the light reflected by the backsheet around the cell in a PV module laminate, which is converted into electrical current by the solar cells in the module relative to a reference rear surface. The presented measurement method allows measuring the light recovery factor as function of the incident light beam angle, which are important for the calculation of the yield analysis in the field. Simulations of the recovery factor with the optical ray tracing program DIADALOS are performed in order to support the interpretation of the results. For measuring the absolute light recovery probability of a backsheet one should use a reference backsheet with an absorbance of close to 100% to avoid systematic reflection errors especially for high incident light beam angles > 50°. The ranking of various recovery factors are compared to the ranking measured by reflectance measurements defined in standard IEC 62788-2 Ed.1 for backsheets. The standard shows a substantial deviation between the ranking of recovery factor and the reflectance which can be corrected by using an adapted definition for the reflectance measurement method.
AB - We measure the short circuit current improvement of various commercial backsheets for passivated emitter and rear solar cells (PERC) in photovoltaic (PV) modules. We quantify this improvement by a light recovery factor k defined as the share of the light reflected by the backsheet around the cell in a PV module laminate, which is converted into electrical current by the solar cells in the module relative to a reference rear surface. The presented measurement method allows measuring the light recovery factor as function of the incident light beam angle, which are important for the calculation of the yield analysis in the field. Simulations of the recovery factor with the optical ray tracing program DIADALOS are performed in order to support the interpretation of the results. For measuring the absolute light recovery probability of a backsheet one should use a reference backsheet with an absorbance of close to 100% to avoid systematic reflection errors especially for high incident light beam angles > 50°. The ranking of various recovery factors are compared to the ranking measured by reflectance measurements defined in standard IEC 62788-2 Ed.1 for backsheets. The standard shows a substantial deviation between the ranking of recovery factor and the reflectance which can be corrected by using an adapted definition for the reflectance measurement method.
KW - Backsheet
KW - Light harvesting
KW - Light trapping
KW - Module efficiency
KW - PV module
UR - http://www.scopus.com/inward/record.url?scp=85049324536&partnerID=8YFLogxK
U2 - 10.1016/j.solmat.2018.06.028
DO - 10.1016/j.solmat.2018.06.028
M3 - Article
AN - SCOPUS:85049324536
VL - 186
SP - 175
EP - 183
JO - Solar Energy Materials and Solar Cells
JF - Solar Energy Materials and Solar Cells
SN - 0927-0248
ER -