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We systematically investigate and compare the structural and optical properties of InGaN nanocolumns (NCs) and InGaN/GaN single quantum structures (SQSs) fabricated on top of GaN NCs as functions of the GaN column diameter. Each InGaN/GaN SQS comprises an In‐rich InGaN single quantum dot at the center of a semipolar Ga‐rich InGaN single quantum well. The InGaN NCs and InGaN/GaN SQSs qualitatively...