Electric-field-induced photovoltaic effect of azo-TiOPc composites

The electric-field-induced photovoltaic effects of TiOPc, DBCL and their composites in ITO/sample/Pt cells are described. The positive photovoltaic responses of TiOPc and DBCL are strongly enhanced when a positive external electric field is applied to the ITO electrode. However, only minimal discrepancies are found in the positive photovoltaic responses of the composites whenever an external electric field is applied. This is attributed to a photoinduced charge transfer between DBCL and TiOPc. An energy diagram of the charge-transfer process is proposed.