New Product: Targray’s ‘Peak Sun’ dopants contribute to higher cell conversion efficiencies

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Product Briefing Outline: Targray Technology now offers the Peak Sun POCl3, which is claimed to be the highest purity N-type dopant available to the solar cell manufacturing industry.  Phosphorus Oxychloride (POCl3) is liquid phosphorus used as an N-type dopant in the diffusion process for silicon wafers. Peak Sun’s high purity 99.99999%, 7N, reduces variability in bin distribution, increases minority carrier lifetimes which contribute to higher conversion efficiencies (CE) and provides consistency in the diffusion process. All of which contribute towards a lower manufacturing cost per watt.

Problem: Impurities such as titanium, molybdenum, and vanadium are known to reduce minority carrier lifetimes thus affecting the efficiency of the cell.  Research indicates that these lifetime killers have some of the greatest detrimental effect on the actual performance of the solar cells. Impurities trap electrons and reduce minority carrier lifetime in cells.

Solution: Peak Sun’s POCl3 distillation process was designed to reduce levels of trace elements and other impurities in metals such as titanium, molybdenum, and vanadium that are known to cause problems in the solar cell manufacturing process and have the most detrimental effect on carrier lifetime.  Higher purity means longer minority carrier lifetimes. Break seal technology guarantees the integrity of the chemical by keeping impurities out during transport and storage. The only chemical manufactured in a world class facility assuring no cross contamination. It is tested for purity in a Class-100 clean room.

Applications: Phosphorus Oxychloride (POCl3) is liquid phosphorus used as an N-type dopant in tube diffusion processes for silicon wafers. It is used to form the N-Type emitter of P-N junction and to getter impurities in 6N mono and multicrystalline solar cells.

Platform: Peak Sun POCl3 is available in industry standard 1.5L quartz bubblers fitted with “breakseals” to ensure product integrity. These bubblers are compatible with all current makes of temperature controllers and tube diffusion furnaces. Containers for bulk distribution systems are also available.

Availability: Currently available exclusively through Targray Technology for the North American, European, Indian and Australian PV markets.

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