| 1. | The substrate IBM is using is a material called silicon germanium.
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| 2. | Germanium forms many alloys, most importantly with the coinage metals.
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| 3. | Most of the chemistry of germanium is characteristic of a nonmetal.
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| 4. | Germanium makes up 0.5 parts per trillion of seawater.
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| 5. | Germanium has been found to exist in some very faraway stars.
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| 6. | The estimated human intake of germanium is 1 milligram per day.
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| 7. | Germanium can interfere with such enzymes as oral toxicity in animals.
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| 8. | Some of the germanium minerals are only found in this mine.
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| 9. | In addition, surface passivation of germanium has proven extremely difficult.
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| 10. | These reasons make germanium an unlikely candidate for use in TPVs.
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