Mechanism of Charge Transport in Hybrid Organic-Inorganic PEDOT:PSS/Silicon Heterojunctions

Abstract

Hybrid organic-inorganic heterojunctions have emerged as low-cost alternatives for fabricating optoelectronic devices, but their charge-transport mechanism has not been fully established. In this work, the charge transport in PEDOT:PSS/silicon heterojunctions is found to be governed by a twofold mechanism: injection-limited under reverse bias, space-charge-limited under forward bias. This study provides physical insight into the interpretation of the characteristic current-voltage curves of these and similar hybrid devices.