A photodiode sensor structure includes a first dopant type substrate with a first surface and a second dopant type well region with a second surface. The compositions and methods disclosed herein provide ethylene polymers with low levels of long chain branching. The restraint body is provided in the vicinity of its outer periphery with a retaining hole, a clip to be inserted in and retained by the retaining hole, and a guide surface for guiding the clip into the retaining hole for helping the restraint body to return in the opening of the interior decoration member. The pockets are slightly spaced apart from the cavity by thin partitions.