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Nanocrystalline CdSe thin film prepared by chemical solution deposition was imaged in air with a scaninng tunneling microscope(STM). Scanning tunneling current spectroscopy(STS) was taken at a fixed tip - Sample separation. Tunneling currnt(i) - voltage(v) curve and differential conductance spectrum show an n-type schottky rectifying behaviour and yteld a direct measure of band gap energy. An increase of bandgap energy (1.8 - 2.1eV) was measured indicating energy quantization of this particular thin film.
Nanocrystalline CdSe thin film prepared by chemical solution deposition was imaged in air with a scaninng tunneling microscope (STM). Scanning tunneling current spectroscopy (STS) was taken at a fixed tip - Sample separation. Tunneling currnt (i) - voltage (v) curve and differential conductance spectrum show an n-type schottky rectifying behavior and yteld a direct measure of band gap energy. An increase of bandgap energy (1.8 - 2.1 eV) was measured indicating energy quantization of this particular thin film.