A substrate container includes an enclosure and an access structure formed in the enclosure and providing fluid access through the enclosure to an interior of the substrate container. The polysilane generally has the formula H-nq\u2014H, where each instance of A is independently Si or Ge; R is H, -AaHa+1Ra, halogen, aryl or substituted aryl; \u226710 if q=0, q\u22673 if n=0, and \u22676 if both n and q\u22600; p is 1 or 2; and m is from 3 to 12. The forward warping operator and the backward warping operator provide motion compensation between the frames.