Electrochemical charging of CdSe quantum dot films: dependence on void size and counterion proximity.

摘要: Films of colloidal quantum dots (QDs) show great promise for application in optoelectronic devices. Great advances have been made recent years designing efficient QD solar cells and LEDs. A very important aspect the design devices based on films is knowledge their absolute energy levels. Unfortunately, reported levels vary markedly depending employed measurement technique environment sample. In this report, we determine by electrochemical charge injection. The concomitant change optical absorption film allows quantification number charges quantum-confined thereby energetic position. We here that size voids (i.e., space between dots) determines amount may be injected into films. This effect attributed to exclusion countercharges from electrolyte solution. Further, depends o...