CREATE TABLE table_4268 ("Material" CLOB, "Type" CLOB, "Geometry" CLOB, "Output voltage" CLOB, "Output power" CLOB, "Synthesis" CLOB, "Researched at" CLOB)

Where was d: 25~70nm, l: 10~20 m geometry researched?
SELECT "Researched at" FROM table_4268 WHERE "Geometry" = 'D: 25~70nm, L: 10~20 μm'
SELECT "Researched at" FROM "table_4268" WHERE "Geometry" = 'D: 25~70nm, L: 10~20 μm'