摘要：Incorporating functional molecules into molecular junc- tions as active components is a topic of major interest in the field of molecular electronics [1-7]. Many efforts have been devoted to fabricating switchable molecular elec- tronic devices that are responsive to external stimuli [8,9]. Among various stimuli （e.g., redox process [ 10], pH[ 11 ], magnetic field [12]）, light offers a dean, non-invasive, low-cost and easily addressable way for triggering mole- cular switches in electrical devices [13,14].