EU PVSEC: DuPont offers ‘Solamet PV18A’ for enhanced LDE cell performance

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DuPont Microcircuit Materials (MCM) has introduced its next-generation frontside metallization pastes for crystalline silicon solar cells. ‘DuPont  Solamet PV18x’ series photovoltaic metallization pastes are claimed to offer PV manufacturers improved productivity beyond that provided by the ‘Solamet PV17x’ series. ‘Solamet PV18A’ is claimed to be the first metallization paste tailored for optimal performance on mono-crystalline wafers with enhanced Lightly Doped Emitters (LDEs).

Problem

Photovoltaic cell manufacturing is a challenging business where excess supply continually drives down cell and module pricing.  Manufacturers are looking at ways to improve productivity by increasing cell and module efficiencies and lifetimes while keeping their costs in line with the rapidly reducing module average selling price.

Solution

PV18A is claimed to demonstrate efficiency gains despite significantly less material consumption when compared to Solamet PV17F. MCM is concurrently developing diffusion recipes in-house aimed at boosting solar cell efficiencies beyond the 19.3% level already demonstrated with Solamet PV18A. PV18A is the first version of a new series, and plans are to continue to expand the series to address the specific needs of various market segments such as achieving even finer lines to support further reductions in the cost of ownership of multi-crystalline cells with high RSheet LDEs.

Applications

Mono-crystalline wafers with contact emitters having low phosporous  surface concentration for Lightly Doped Emitters (LDE cells).

Platform

Solamet PV17A photovoltaic metallization front side paste is a highly conductive silver composition, part of the DuPont Solamet PV17x family, designed to provide improved efficiency, reliable soldered adhesion and low lay down. This paste may be co-fired with back side (p-type) aluminum conductors such as ‘DuPont Solamet ]PV3xx’ and ‘DuPont SolametPV5xx’ tabbing silvers. It is designed for rapid dry and very fast (spike) firing. Thermal budget above 600°C should be kept to minimum, ideally <8 seconds to ensure optimum electrical contact to the wafer. To get the best electrical performance, PV17A should be fired at a peak temperature around 30°C higher than for PV16X conductors.

Availability

September 2012 onwards. 

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