期刊
SOLAR ENERGY MATERIALS AND SOLAR CELLS
卷 143, 期 -, 页码 457-466出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solmat.2015.07.041
关键词
Thin crystalline silicon solar cells; Liquid-phase crystallisation; Light trapping; Anti-reflection; Light beam induced current; Ray-tracing simulation
资金
- German Federal Ministry of Education and Research (BMBF)
- German Federal Ministry of Environment (BMU)
- state government of Berlin (SENBWF) [03IS2151, 0325237]
We present a detailed analysis of the photo-current potentials and losses in thin film crystalline silicon solar cells on glass. The effects of texturing the silicon backside, applying a diffuse back reflector and a textured antireflection foil were analysed. Light beam induced current measurements were used to determine the losses due to local effects like the absorber contact, cracks in the absorber and grain boundaries. Detailed loss analysis in combination with ray-tracing simulations showed that the maximum light trapping potential imposed by geometrical optics has nearly been achieved. The photocurrent losses due to incomplete carrier collection and parasitic absorption were accounted for using a theoretical model. For the investigated, textured, n-doped cell with reflector and anti-reflection foil, the short circuit current density (J(SC)) was 28.9 mA/cm(2) and the main loss factors were direct reflection (3.4 mA/cm(2)), electrical shading effects due to the absorber contact (3.1 mA/cm(2)) and incomplete carrier collection due to surface/bulk recombination (1.6 mA/cm(2)). Using the presented light trapping scheme we obtained the following efficiencies: 11.8% for a p-doped and 12.1% for an n-doped crystalline silicon absorber. Finally, the potentials for efficiencies beyond 14% are discussed. (C) 2015 Elsevier B.V. All rights reserved.
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