DocumentCode :
2739340
Title :
Light management for reduction of bus bar and gridline shadowing in photovoltaic modules
Author :
Jaus, J. ; Pantsar, H. ; Eckert, J. ; Duell, M. ; Herfurth, H. ; Doble, D.
Author_Institution :
Fraunhofer Center for Sustainable Energy Syst., Cambridge, MA, USA
fYear :
2010
fDate :
20-25 June 2010
Abstract :
Solar cells used in photovoltaic (PV) crystalline silicon modules commonly feature grid fingers and bus bars as front contacts. The grid fingers and bus bars partially block the sunlight from reaching the semiconductor layers of a solar cell and therefore reduce the efficiency of a solar module. In this paper, we present experimental results of different technologies to reduce the shadowing effect that bus bars and grid fingers impose. We focus on two technologies that can be easily integrated into standard PV module technology and help to increase the module´s efficiency. In the first technology, a laser is used to create a scattering pattern on the front glass of the module. This pattern directs light away from the bus bars and grid fingers. In the second technology, the bus wires are coated with a diffuse reflective coating. The sunlight is diffusely reflected at this coating. A part of it is reflected at such angles that internal reflection at the front surface of the cover glass occurs. From there the light is reflected back to the solar cell and contributes to the generated photocurrent.
Keywords :
busbars; silicon; solar cells; bus wires; busbar reduction; diffuse reflective coating; grid fingers; gridline shadowing reduction; light management; photocurrent; photovoltaic crystalline silicon modules; solar cells; solar module; Bars; Fingers; Glass; Photovoltaic cells; Reflection; Scattering; Surface treatment;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Photovoltaic Specialists Conference (PVSC), 2010 35th IEEE
Conference_Location :
Honolulu, HI
ISSN :
0160-8371
Print_ISBN :
978-1-4244-5890-5
Type :
conf
DOI :
10.1109/PVSC.2010.5614568
Filename :
5614568
Link To Document :
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