What are potential applications of ZnO in the field of optoelectronics ?
Photovoltaic cells and light- emitting diodes (LEDs)
Photovoltaic cells and light-emitting diodes (LEDs) option is correct.
Zinc oxide (ZnO) is a wide direct-bandgap semiconductor with \(E_g \approx 3.37\,\text{eV}\) and a very large room-temperature exciton binding energy of about \(60\,\text{meV}\). Both properties make it a natural material for near-ultraviolet and blue optoelectronics.
Because it is transparent in the visible range, ZnO thin films are widely used as transparent conducting electrodes and window layers for photovoltaic cells (CIGS, dye-sensitised and thin-film Si cells). Its strong band-edge emission and radiative recombination make it a candidate for UV/blue LEDs and laser diodes, and ZnO-based heterojunctions have been demonstrated as electroluminescent devices.
Quantum computing, superconductivity, magnetic storage and fuel-cell electrocatalysis are not primary application areas of ZnO. Gas sensing is a real ZnO application but sits under chemical sensing rather than optoelectronics, so the photovoltaic-plus-LED pairing is the correct optoelectronic answer.
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Important Questions from Mixed Topic (MH-SET)
.................... is a client server application that identifies each host on the internet with a unique user-friendly name.
Every OS has a ................ or .......... which primarily resides in the main memory of the computer to perform some of the basic functions of the OS.
(i) Kernel
(ii) Interface
(iii) Nucleus
(iv) Compiler
Codes:
Which of the following are referred to as low level language?
(i) Machine language
(ii) Assembly language
(iii) High level language
(iv) Natural language
Codes:
Match the following:
List I List II (a) New York Public Library (i) Shelv AR (b) Miami University Augmented Research Group (ii) Smart library (c) Oula University Library (iii) Wolf Walk (d) North Carolina State University (iv) Find the future Codes:
Which part of the QR code represents the encoded data?
