... Elements Analytical methods applied Product specificationsParameter Elements Analytical methods appliedPackagingDonors (P, As, Sb) ≤ 5.0ppbaAcceptors (B, Al) ≤ 0.1ppbaphoto-luminescence spectroscopy ... notice. For more information, please contact our sales representatives monocrystalline solar ingot,solar cells,solar panels,solar inverter,6N,9N poly silicon,