Solar Power and Solar Panels

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What is the shape of the solar modules?

Circular

Triangular

Rectangular

Octagonal (correct)

Who discovered the photovoltaic effect in 1839?

Alexandre-Edmond Becquerel (correct)

Gallium Selenide

Copper Indium

Russel Oh

What is the process of producing electrical power in photovoltaic solar cells?

When an electron is expelled from the p-type material

When an electron is expelled from the n-type material

When a photon with sufficient energy impinges on the p-type and n-type junction (correct)

When a photon with insufficient energy impinges on the p-type and n-type junction

What is the purpose of packing solar cells together?

To form solar modules Signup and view all the answers

What is the colour of solar modules?

Bluish-black Signup and view all the answers

Who invented the first modern silicon solar cell in 1946?

Russel Oh Signup and view all the answers

What is the result of a change in P in a crystal?

A variation of surface charge density upon the crystal faces Signup and view all the answers

What is the voltage produced by a 1 cm3 cube of quartz with 2 kN of correctly applied force?

12500 V Signup and view all the answers

What is the converse piezoelectric effect?

The creation of an electrical field by mechanical deformation Signup and view all the answers

Why do we measure the voltage across the capacitor in piezoelectric generators?

To ensure the device is working correctly Signup and view all the answers

What is one of the potential applications of piezoelectric materials?

Energy harvesting Signup and view all the answers

What is the current limitation of piezoelectric energy harvesting devices?

They are unable to produce a sufficient amount of energy Signup and view all the answers

What is the type of silicon formed when a layer of silicon with an excess of electrons is created?

n-type silicon Signup and view all the answers

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 Signup and view all the answers

What is the result when light is shone on the silicon sandwich?

The current increases Signup and view all the answers

What determines the magnetic properties of a material?

The electron cloud arrangement Signup and view all the answers

What is formed when an atom or group of atoms behaves magnetically?

A magnetic dipole Signup and view all the answers

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 Signup and view all the answers

What is the result of bringing a metal and a semiconductor material together?

No electron movement occurs during the contacting process Signup and view all the answers

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 Signup and view all the answers

What is the purpose of the Schottky barrier?

To block electron flow across the diode Signup and view all the answers

Under equilibrium conditions, what happens to the electrons?

Electrons transfer from the semiconductor to the metal Signup and view all the answers

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 Signup and view all the answers

What is the result of aligning the Fermi energy of the metal and the semiconductor?

A potential energy barrier is formed at the junction Signup and view all the answers

What is the piezoelectric effect a result of?

The linear electromechanical interaction between mechanical and electrical states Signup and view all the answers

What happens when an external electric field is applied to lead zirconate titanate crystals?

They change about 0.1% of their static dimension Signup and view all the answers

What is the inverse piezoelectric effect used for?

Producing ultrasound waves Signup and view all the answers

What is one of the everyday uses of the piezoelectric effect?

Generating sparks to ignite gas cooking and heating devices Signup and view all the answers

What is the minimum deformation required to generate measurable piezoelectricity in lead zirconate titanate crystals?

0.1% of the original dimension Signup and view all the answers

What is the piezoelectric effect used for in scanning probe microscopes?

To resolve images at the scale of atoms Signup and view all the answers