30 Questions
What is the shape of the solar modules?
Octagonal
Who discovered the photovoltaic effect in 1839?
Alexandre-Edmond Becquerel
What is the process of producing electrical power in photovoltaic solar cells?
When a photon with sufficient energy impinges on the p-type and n-type junction
What is the purpose of packing solar cells together?
To form solar modules
What is the colour of solar modules?
Bluish-black
Who invented the first modern silicon solar cell in 1946?
Russel Oh
What is the result of a change in P in a crystal?
A variation of surface charge density upon the crystal faces
What is the voltage produced by a 1 cm3 cube of quartz with 2 kN of correctly applied force?
12500 V
What is the converse piezoelectric effect?
The creation of an electrical field by mechanical deformation
Why do we measure the voltage across the capacitor in piezoelectric generators?
To ensure the device is working correctly
What is one of the potential applications of piezoelectric materials?
Energy harvesting
What is the current limitation of piezoelectric energy harvesting devices?
They are unable to produce a sufficient amount of energy
What is the type of silicon formed when a layer of silicon with an excess of electrons is created?
n-type silicon
What happens to the electrons in the p-type layer when photons from light hit the silicon?
They get excited and jump to the n-type layer
What is the result when light is shone on the silicon sandwich?
The current increases
What determines the magnetic properties of a material?
The electron cloud arrangement
What is formed when an atom or group of atoms behaves magnetically?
A magnetic dipole
What happens to the electrons when a layer of n-type silicon is placed on top of a layer of p-type silicon?
They get blocked by the barrier
What is the result of bringing a metal and a semiconductor material together?
No electron movement occurs during the contacting process
What is the relationship between the work function of semiconductors and electron affinity?
The work function of semiconductors is related to electron affinity, conduction band, and Fermi energy
What is the purpose of the Schottky barrier?
To block electron flow across the diode
Under equilibrium conditions, what happens to the electrons?
Electrons transfer from the semiconductor to the metal
What is the definition of the barrier height ΦB?
The energy difference between the band edge with majority carriers and the Fermi energy of the metal
What is the result of aligning the Fermi energy of the metal and the semiconductor?
A potential energy barrier is formed at the junction
What is the piezoelectric effect a result of?
The linear electromechanical interaction between mechanical and electrical states
What happens when an external electric field is applied to lead zirconate titanate crystals?
They change about 0.1% of their static dimension
What is the inverse piezoelectric effect used for?
Producing ultrasound waves
What is one of the everyday uses of the piezoelectric effect?
Generating sparks to ignite gas cooking and heating devices
What is the minimum deformation required to generate measurable piezoelectricity in lead zirconate titanate crystals?
0.1% of the original dimension
What is the piezoelectric effect used for in scanning probe microscopes?
To resolve images at the scale of atoms
Test your knowledge about solar power, solar modules, and solar panels. Learn about the history of solar cells, from Alexandre-Edmond Becquerel's discovery of the photovoltaic effect to Russel Oh's invention of the modern silicon solar cell.
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