The currentvoltage characteristics of the cell under these conditions were obtained by applying an external potential bias to the cell and measuring the generated photocurrent on a Keithley model 2400 digital source meter (Keithley, U.S.A.).
The currentvoltage characteristics of the cell under these conditions wereobtained by applying an external potential bias to the cell andmeasuring the generated photocurrent on a Keithley model2400 digital source meter (Keithley, U.S.A.).