the chlorophyll thin film that deposited on ITO substrate was used to fabricate a p-n junction diode.
Before deposition, 3 mm of ITO was removed using mixture of 2 ml nitric acid and 6 ml hydrochloride acid.
The removal of ITO is important for a p-n junction.
The temperature of deposition process was 24C.
As shown in Fig.2,Aluminum as eletrode cathode was built on the edge of the ITO substrate using the Electron Gun at a pressure of 2.5 mbar.