Direct Imaging and Probing of the p−n Junction in a Planar Polymer Light-Emitting Electrochemical Cell

摘要: A vast array of semiconductor applications relies on the ability to dope materials by controlled introduction impurities in order achieve desired charge carrier concentration and conduction type. In this way, various functional metal/semiconductor or semiconductor/semiconductor junctions can be constructed for device applications. Conjugated polymers are organic semiconductors that electrochemically doped form a dynamic p−n junction. The electronic structure even existence such polymer junction had been subject intense scrutiny debate. work, formation world’s largest frozen its light-emission visualized. With pair micromanipulated probes, we mapped potential distribution under bias across entire interelectrode gap over 10 mm. Site-selective current−voltage measurements reveal is graded junction, with much more conductive p region than n r...