Imec, RENA develop a new low-cost texturing process for high efficiency PERC solar cells

Imec, RENA develop a new low-cost texturing process for high efficiency PERC solar cells
RENA BatchTex N process tank

At this week's European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC 2014, nanoelectronics research center imec, and RENA, a leading supplier for wet chemical production tools, present a novel isopropyl-alcohol (IPA)-free process for the texturing of Cz-Si wafers for high-efficiency silicon solar cell manufacturing at low cost.

The uses monoTEX F, RENA's next generation texturing additive, instead of the currently used industrial additive IPA. In contrast monoTEX F is a moderating and wetting agent that behaves almost "linear" towards changes in process temperature and alkali concentration and operates at temperatures far below its boiling point . It will thus not evaporate, resulting in stable concentration of ratios in the etching mixture during the texturing process step. As a result, monoTEX F based texturing simplifies the texturing of Cz-Silicon wafers, widens the texturing process window, and increases texturing bath lifetime (i.e. more wafers can be processed in a single texturing bath compared to state-of-the-art IPA-based texturing).

"When applying this novel monoTEX F-based texturing in our Si PV pilot line to process large area (156x156 mm2) PERC-type solar cells, we achieved excellent conversion efficiencies well above 21%, ," stated Dr. Joachim John, R&D project manager at imec. "We are confident that RENA's monoTEX F-based texturing process is an excellent candidate to be considered for next generation high volume Cz-silicon solar cell manufacturing."

"We are very happy that in a first class institution like imec one can take advantage of our texturing agent monoTEX F. The achieved uniformity and reflection data from imec are consistent with mass production data," Dr. J├╝rgen Schweckendiek, R&D project manager at RENA, pointed out.

Imec, RENA develop a new low-cost texturing process for high efficiency PERC solar cells
Reflectance of cz-wafers processed with monoTEX F based texturing chemistry, measured at 700 nm. As guidance 9.9 % @ 700 nm = 11.31 AWR

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Citation: Imec, RENA develop a new low-cost texturing process for high efficiency PERC solar cells (2014, September 22) retrieved 27 September 2020 from https://phys.org/news/2014-09-imec-rena-low-cost-texturing-high.html
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