CREATE TABLE table_4267 ("Material" CLOB, "Type" CLOB, "Geometry" CLOB, "Output voltage" CLOB, "Output power" CLOB, "Synthesis" CLOB, "Researched at" CLOB)

Where was d: ~100nm, l: 1 m geometry researched?
SELECT "Researched at" FROM table_4267 WHERE "Geometry" = 'D: ~100nm, L: 1 μm'
SELECT "Researched at" FROM "table_4267" WHERE "Geometry" = 'D: ~100nm, L: 1 μm'