Air-bridge-type electrodes for high-efficiency photovoltaic cell

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Air-bridge-type electrodes for high-efficiency photovoltaic cell

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Recently, the important issues relating to the photovoltaic cell have featured low cost and high efficiency. To make a low-cost and high-efficiency photovoltaic cell, there are many aspects such as the development of inexpensive wafers, process simplification and improvement of optical and electrical properties. In this study, the two-step texturing method using a microblaster was developed to decrease the reflection of incident lights. Bridge-type electrode structures are suggested to expand the effective surface area and decrease the series resistance of finger electrodes. The authors decided to use 10 µm size powders since the efficiency of the solar cell could rather be reduced by using 50 µm size powders because of their extremely rough surface. And the surface of the wafer after microblaster etching was treated with a chemical etching method using HNA (HF:HNO3:CH3COOH=4:9:7) solution, a dry etching method using reactive ion etching and a oxide etching method.

Inspec keywords: texture; reflectivity; powder technology; electrochemical electrodes; surface roughness; solar cells; electric resistance

Other keywords: reactive ion etching; bridge-type electrode structures; air-bridge-type electrodes; wafer surface; powders; effective surface area; optical properties; chemical etching method; microblaster etching; finger electrodes; incident light reflection; oxide etching method; high-efficiency photovoltaic cell; two-step texturing method; series resistance; dry etching method; electrical properties; size 10 mum; rough surface; solar cell efficiency

Subjects: Solar cells and arrays; Powder techniques, compaction and sintering; Electrochemistry and electrophoresis; Cold working, work hardening; post-deformation annealing, recovery and recrystallisation; textures; Solid surface structure; Optical constants and parameters (condensed matter); Photoelectric conversion; solar cells and arrays

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      • L. Partain . (1995) Solar energy conversion.
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      • M.C. Elwenspoek , H.V. Jansen . (1998) Silicon micromachining.
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