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New Opportunities for Tin Use (cont’d)<br />

leaD-FRee BeaRIngS<br />

Tin is replacing lead in bearings used in cars. Lead-bronze<br />

white metal bearings have been used for decades in cars and<br />

other applications but lead is being phased out in this market.<br />

Up to 12% tin is now being used in new lead-free bearings<br />

launched by major European automotive suppliers Federal<br />

Mogul, Miba and ECKA.<br />

SolaR cellS<br />

Tin is ahead in the race for the next generation of cheaper<br />

solar cell materials. Today solar cells use expensive and rare<br />

elements such as gallium and more ‘earth-abundant’ materials<br />

are needed. Kesterite, containing 30% tin, was the first to cross<br />

the 10% efficiency barrier in an IBM research laboratory.<br />

Solar cell technology (often referred to as ‘photovoltaics’)<br />

is advancing rapidly and is recognised as being the leading<br />

alternative energy source. Conventional bulk silicon modules<br />

are being superseded by thin film photovoltaic assemblies and<br />

this new technology is expected to dominate the solar cell<br />

market in the years ahead.<br />

Tin oxide already has a modest use in transparent conducting<br />

oxide top layers (used extensively in current technologies).<br />

These are mainly indium – tin oxide (ITO) conductive films,<br />

but gradual replacement of ITO by more sustainable fluorine<br />

doped tin oxide could increase consumption.<br />

Potential replacement materials for cadmium telluride (CdTe)<br />

and copper – indium – gallium – selenide (CIGS) in the light<br />

absorbing layer itself could include the 30% tin containing<br />

material, kesterite (copper – zinc – tin sulphide) if the 10%<br />

efficiency measured by IBM can be increased further.<br />

MALAYSIA SMELTING CORPORATION BERHAD (43072-A) • ANNUAL REPORT 2011 43

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