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Koninklijke Philips N.V Message Board

  • jcreamer007 jcreamer007 Aug 29, 2013 9:52 AM Flag

    THE MAIN INCENTIVE FOR MAKING LED-ON-SI IS COST, NOT PERFORMANCE

    THE MAIN INCENTIVE FOR MAKING LED-ON-SI IS COST, NOT PERFORMANCE
    The potential advantage of LED on Si is cost, not performance. The key conditions for LED on Si to succeed
    are:

    1. Must equal LED on Sapphire performance
    2. Must reach similar manufacturing yields
    3. Must be compatible with CMOS, ideally on 200mm

    The major incentive for a transition to Si wafers for LED manufacturing is the possibility to process the epiwafers in 150 mm or 200 mm fully depreciated and highly automated (efficient) CMOS fabs.
    If technology hurdles are cleared, LED on Si will be adopted by some LED manufacturers, but will not necessarily become the standard. A single large CMOS fab could supply worldwide LED demand for years to come. As a result, massive adoption of LED on Si would dramatically change the landscape of the front-end LED industry. It would facilitate the emergence of new or smaller players who currently don’t have access to the capital needed to become major players in the industry, and could also entice vertically
    integrated LED makers to abandon in-house chip manufacturing because of higher production costs.
    All major LED companies are investigating LED on Si, but only 3 (Bridgelux / Toshiba, Plessey and Lattice Power) have so far committed to the transition and Osram has just announced the building of a pilot line.

    The simulation shows a potential cost benefit of 60% at the die level, with the bulk of the savings coming from the processing in CMOS fabs. Proponents of a transition to Si (Bridgelux / Toshiba, Lattice Power, Azzurro) claim similar cost benefits of about 70% by switching from 2” sapphire to 6” or 8” silicon. With the die typically representing 5 5% of a packaged LED cost, such cost reduction could translate into an immediate 30% improvement in the packaged LED cost. While significant, this is put in perspective with the DOE packaged LED cost reduction roadmap, and historical packaged LED price.

 
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