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Organic semiconductors; photovoltaics; heterojunctions; Schottky diodes

Organic solar cells using the CuPc and PTCBI semiconductor layers were studied. A high open circuit voltage of 1.15 V was obtained in a device with ITO/PEDOT:PSS/CuPc (15 nm)/PTCBI (7 nm)/Al structure. Results were interpreted in terms of a modified CuPc-Al Schottky diode for the thin PTCBI case and a CuPc-PTCBI heterojunction for the thick PTCBI case. Also, the formation of a thin aluminum oxide layer under the aluminum electrode was postulated. This layer has a beneficial aspect wherein shunting losses are reduced and a high photovoltage is enabled. However, it adds greatly to the series resistance to a point where the short circuit current density is reduced. CuPc Schottky diodes with an ITO/PEDOT:PSS/CuPc/Al structure yielded a high V_oc of 900 mV for a CuPc layer of thickness 140 nm. The V_oc increased with increase in CuPc layer thickness.

V P Singh¹ R S Singh¹ A M Hermann¹

1. Electrical and Computer Engineering Department and Center for Nanoscale Science and Engineering, University of Kentucky, Lexington, KY - 40506, USA

Published

July 2006