Electronic structure and band alignment of 9,10-phenanthrenequinone passivated silicon surfaces

► 9,10-phenanthrenequinone (PQ) passivates dangling bonds on the silicon(100) surface. ► PQ is deposited at room temperature but leads to electronically ideal Si surfaces. ► PQ reacts with Si surface atoms to form a 9,10-dihydroxyphenanthrene adduct. ► PQ/Si interface is a staggered (type-I) heterojunction.