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Which of these have higher output per square unit*, phototransistors, photodiodes or APD photodiodes.?
A phototransistor is a type of semiconductor device that is used to detect light and convert it into an electrical signal. It is a combination of a photodiode and a transistor, and is commonly used in electronic devices such as cameras, light sensors, and remote controls.
A phototransistor works by utilizing the photoelectric effect. When light strikes the base-collector junction of the transistor, it creates electron-hole pairs in the base region, which causes an increase in current flow through the collector-emitter circuit. The amount of current produced is directly proportional to the intensity of light hitting the phototransistor.
The output of a phototransistor can be affected by several factors, including the intensity and wavelength of light, ambient temperature, and the bias voltage applied to the device. It is important to consider these factors when selecting a phototransistor for a specific application.
The size of a phototransistor can affect its output per square unit in two ways. First, a larger phototransistor will have a larger surface area to capture more light, resulting in a higher output. Second, a larger phototransistor may have a lower resistance, which can also increase the output. However, the specific design and materials used in the phototransistor will ultimately determine its output per square unit.
It depends on the specific application and the type of light sensor being compared. In general, phototransistors can be more sensitive than other light sensors, such as photodiodes, due to their ability to amplify the current produced by light. However, other factors such as cost, size, and response time may also play a role in determining which type of light sensor is best suited for a particular application.