8 LEDs and Solar Cells

Who developed the first practical LED in 1962?

• Nick Holonyak Jr.

• Shuji Nakamura

• Isamu Akasaki

• Hiroshi Amano

What is the phenomenon where a material emits light in response to an electric current or a strong electric field called?

• Electromagnetism

• Electroluminescence

• Photoelectric Effect

• Thermoluminescence

Which compound semiconductor is used for green and red LEDs known for their brightness and efficiency?

• Gallium Arsenide (GaAs)

• Perovskite

• Gallium Phosphide (GaP)

• Silicon

What is the ratio of photons emitted from the LED to the number of electrons injected into the device called?

• Power Efficiency

• Quantum Efficiency (QE)

• External Quantum Efficiency (EQE)

• Internal Quantum Efficiency (IQE)

Which French physicist first observed the photovoltaic effect in 1839?

• Shuji Nakamura

• Nick Holonyak Jr.

• Charles Fritts

• Edmond Becquerel

What is the process where photons with an energy larger than the band gap of the semiconductor generate electron-hole pairs called?

• Electromagnetism

• Photoelectric Effect

• Photovoltaic Effect

• Quantum Tunneling

Which type of solar cells are recognizable by their uniform dark look and rounded edges?

• Perovskite Solar Cells

• Thin-Film Solar Cells

• Polycrystalline Solar Cells

• Monocrystalline Solar Cells

What is the ratio of the light output (in lumens) to the electrical power input (in watts) called?

• Quantum Efficiency (QE)

• Internal Quantum Efficiency (IQE)

• External Quantum Efficiency (EQE)

• Power Efficiency

Which material has emerged as a highly efficient material for solar cells with rapid efficiency improvements?

• Perovskite

• Organic molecules

• Quantum Dots

• Silicon

What is the process where electrons and holes are injected into the emissive layer from the cathode and anode, respectively, in OLEDs?

• Photon Emission

• Electroluminescence

• Recombination

• Transition