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Contents

Electronic Devices

PN Junction

PN Junction Basics Forward and Reverse Bias Diode Equation Junction Capacitance Breakdown Mechanisms Small Signal Model

BJT Fundamentals

BJT Operation BJT Configurations Current Components Ebers-Moll Model Transistor Switching

FET Fundamentals

JFET Basics MOS Capacitor MOSFET Structure MOSFET Operation MOSFET I-V CMOS Basic

Special Devices

Zener Diode Tunnel Diode Varactor Diode Schottky Diode UJT

Optoelectronics

Light Emitting Diodes Photodiodes Solar Cells Laser Diodes Fiber Optic Sources Phototransistors Optocouplers

Power Devices

Power Diodes Power MOSFETs IGBTs Thyristors GTO and TRIAC

Other Topics

IC Fabrication Basics Nanoelectronics Intro MEMS Single Electron Transistor

Other Subjects

Analog Electronics Digital Electronics Signals & Systems Control Systems Electromagnetic Theory Digital Communication Analog Communication Network Analysis Microprocessors VLSI Design Verilog HDL Power Electronics Embedded Systems DSP

Section Progress86%

6 of 7 articles

Phototransistors

High gain optical detection.

Updated: 19 March 2026

9 min read

Phototransistor Principles

Test high gain optical detection theory.

Question 1 of 3

Q1.How is the base current generated in a standard two-terminal phototransistor?

Related Articles

Photodiodes

Reverse bias detection, responsivity.

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Laser Diodes

Stimulated emission, optical cavity.

10 min read

Light Emitting Diodes

Recombination, bandgap, materials.

5 min read

Solar Cells

Photovoltaic effect, efficiency, fill factor.

11 min read

UJT

Unijunction Transistor operation.

9 min read

Fiber Optic Sources