Analysis of Methods of Implementation of Selective Emitter Crystal Silicon Sun Lithium Battery

2022/04/08

  Author :Iflowpower – Portable Power Station Supplier

The selection emitter (SE-Selectiveemiter) crystal silicon solar cell, that is, the metal gate line (electrode) is rejected to the silicon contact portion, lightly doped between the electrodes. Such a structure can reduce the diffusion layer composite, thereby improving the short-wave response of the light, while reducing the contact resistance of the front metal electrode and the silicon, making the short-circuit current, open circuit voltage, and filling factors to improve, thereby improving conversion efficiency. The advantage 1 of the structural battery reduces the series resistance, improves the filler factor 2, reducing carrier Auger composite, improves surface passivation effect 3, improves the light short wave spectral response, improves short-circuit current and open circuit voltage, printing phosphopers (Yunnan Normal University ) Features: The phosphite is easy to volatilize, the selectivity is poor.

Can also achieve selective diffusion in one time. Second, the corrosion of the diffusion mask layer (Nanjing Middle Power) Features: The barrier layer is silicon oxide or silicon nitride, etching the slurry is important to etch. It is also possible to control silicon oxide film thickness, form a semi-blocking film, disposable diffusion.

Difficulties, slurry printing properties, diffusion uniformity, printing alignment. Third, the direct printing mask layer (Schmid, Centrotherm) Features: Requires the printing characteristics of the mask to be good, anti-hydrofluoric acid is good, easy to remove. Process steps.

Difficult, diffusion is uniform, printing is aligned. Schmid's Corrosion SE Battery Transfer Key Engineering, Centrothers Laser Eclipse Oxidation Film SE Battery Transfer. Fourth, wet corrosion rejection layer / plasma etching rejection characteristics: wet method can be used in hydrofluoric acid and nitric acid system or strong base to corrode exposed heavy diffusion layer into shallow diffusion layer.

Corrosion-resistant slurry. Dry plasma, fluoride ions formed by fluoride or fluorinated fluoride or other fluoride, etc. The dry method can also be masked with silver paste.

V. LDSE (New South Wales) Features: Use laser and electroplating, more process, complex process. Electroplating has a variety of options.

Electroplating silver conductivity is about 10 times the silver pulp. Can save precious metals. Use nickel copper silver, or nickel-copper tin structure, you can save your precious metals.

You can do it very thin, or other optimized structures. Six, Silicon ink technology (Innovalingt, OTB) Features: Just add a printing machine, you can achieve a larger efficiency improvement. Easily upgrade on the basis of existing process equipment.

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