Small organic molecule semi-conducting chromophores containing a pyridalthiadiazole, pyridaloxadiazole, or pyridaltriazole core structure are disclosed. Such compounds can be used in organic heterojunction devices, such as organic small molecule solar cells and transistors.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
 This invention was made with United States government support under grant no. DE-DC0001009 awarded by the Center for Energy Efficient Materials of the Department of Energy and under grant no. N-00014-04-0411 awarded by the Office of Naval Research. The government has certain rights in the invention.