In most semiconductors, the effective mass of a hole is much larger than that of an electron. This results in lower mobility for holes under the influence of an electric field and this may slow down the speed of the electronic device made of that semiconductor. This is one major reason for adopting electrons as the primary charge carriers, whenever possible in semiconductor devices, rather than holes. This is also why NMOS logic is faster than PMOS logic. OLED screens have been modified to reduce imbalance resulting in non radiative recombination by adding extra layers and/or decreasing electron density on one plastic layer so electrons and holes precisely balance within the emission zone. However, in many semiconductor devices, both electrons and holes play an essential role. Examples include p–n diodes, bipolar transistors, and CMOS logic.
In most semiconductors the effective mass of a hole is much larger than that of an electron This results in lower mobility for holes under the influence of an electric field and this may slow down the speed of the electronic device made of that semiconductor This is one major reason for adopting electrons as the primary charge carriers whenever possible in semiconductor devices rather than holes This is also why NMOS logic is faster than PMOS logic OLED screens have been modified to reduce imbalance resulting in non radiative recombination by adding extra layers and/or decreasing electron density on one plastic layer so electrons and holes precisely balance within the emission zone However in many semiconductor devices both electrons and holes play an essential role Examples include p–n diodes bipolar transistors and CMOS logic