An international team of researchers including Princeton (Prof. Antoine Kahn, graduate students Xin Lin, Kyung Min Lee, Michael A. Fusella, and Fengyu Zhang) have used ultraviolet light to split molecules that had been added to a semiconductor. The reaction involves transferring an electron from the added molecule to the semiconductor. This process, called doping, results in a surprisingly stable structure and improves the conductivity of the semiconductor dramatically. The discovery points the way to more widespread use of an advanced technology generally known as organic electronics.