Disclosed herein are exciton-blocking treatments for buffer layers used in organic photosensitive optoelectronic devices. More specifically, the organic photosensitive optoelectronic devices described herein include at least one self-assembled monolayer disposed on the surface of an anode buffer layer. Methods of preparing these devices are also disclosed. The present disclosure further relates to methods of forming at least one self-assembled monolayer on a substrate.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH
 This invention was made with U.S. Government support under Contract Nos. DE-EE0005310 and DE-SC0000957 awarded by the Department of Energy. The government has certain rights in the invention.