All photocurrent
measurements were performed inside a nitrogen atmosphere glovebox
with 3 mbar pressure. This type of measurement was conducted using
two Keithley 2400 source meters: one was used to supply the power
to the laser diode, and the other was used to supply the voltage to
devices and monitor the channel current. All of the experimental parameters
and data were controlled and collected by a self-developed LabVIEW
program. The 405 nm laser illumination was supplied using KOKUYO laser
diodes, and the linear polarizer and 405 nm quarter wave plate were
purchased from Thorlabs Inc. The power density of the laser diode
was adjusted by inserting a series of neutral density filters between
the quarter-wave plate and the device, and the power of the laser
was calibrated using a Field Mate laser power meter from Coherent
Inc. The pulse-mode laser signal was generated using an Agilent 33220A
function generator with controlled software to power the laser diode,
and the energy of the pulse-mode laser was calibrated using Ophir
Laserstar P/N 7021600 power meter with a lower limit of detection
of 1 pW.
measurements were performed inside a nitrogen atmosphere glovebox
with 3 mbar pressure. This type of measurement was conducted using
two Keithley 2400 source meters: one was used to supply the power
to the laser diode, and the other was used to supply the voltage to
devices and monitor the channel current. All of the experimental parameters
and data were controlled and collected by a self-developed LabVIEW
program. The 405 nm laser illumination was supplied using KOKUYO laser
diodes, and the linear polarizer and 405 nm quarter wave plate were
purchased from Thorlabs Inc. The power density of the laser diode
was adjusted by inserting a series of neutral density filters between
the quarter-wave plate and the device, and the power of the laser
was calibrated using a Field Mate laser power meter from Coherent
Inc. The pulse-mode laser signal was generated using an Agilent 33220A
function generator with controlled software to power the laser diode,
and the energy of the pulse-mode laser was calibrated using Ophir
Laserstar P/N 7021600 power meter with a lower limit of detection
of 1 pW.