Chapter 2 + 3 (Theory) (Einstein's Photoelectric Effect (Blue light of…
Chapter 2 + 3 (Theory)
Einstein's Photoelectric Effect
Blue light of high frequency can cause sodium to emit electrons
Red light of low frequency
cause sodium to emit electrons
High photon frequency --> High Photon Energy --> Causes metals like sodium to emit light
Light is not made of particles or wave, but of photons (Each individual photon's Energy = h*frequency)
Methods of characterization / Material Analysis
Mechanical Measurements (Hardness,strength)
Electric and Magnetic Measurements (SQUID)
Diffraction Techniques (X-ray or electron diffraction)
Classical (Eye Piece) vs Digital (Camera+Monitor)
Used to analyse photon's interaction with nanostructure
Higher Resolution with Same Size of view Sample
Detailed Video Explanation
Concept of Optical Vs Electron
Characterize to understand and control products
Surface Properties (eg.tension?)
Alternate Source of Energy: Quantum Dots in Solar Panel
Many diff sized quantum dots --> cater to many different band gap --> absorb photons of wide spectrum --> increase panel efficiency.
Photon energy received has different range of band gap --> not all absorbed.
Uses a doped semiconductor such as silicon or gallium arsenide.
λ = (0.2898×10^-2 mK)/ T