Methods used in forming a memory array comprising strings of memory cells and through-array vias in a through-array-via region wherein tav openings and horizontally-elongated trenches are formed or wherein tav constructions comprise first and second non-conductive cylinders

Abstract

A method used in forming a memory array comprising strings of memory cells comprises forming a stack comprising vertically-alternating first tiers and second tiers. The stack comprises laterally-spaced memory-block regions and a through-array-via (TAV) region. The stack comprises channel-material strings extending through the first tiers and the second tiers. The stack comprises horizontally-elongated trenches extending through the first tiers and the second tiers and that are individually between immediately-laterally-adjacent of the memory-block regions. The stack comprises TAV openings in the TAV region. Conductive material is formed in the TAV openings and in the horizontally-elongated trenches at the same time. All of the conductive material is removed from the horizontally-elongated trenches while leaving the conductive material in the TAV openings to comprise TAVs therein in a finished circuitry construction. After the removing, intervening material is formed in the horizontally-elongated trenches. Other embodiments, including structure, are disclosed.