Quantum well devices have been the objects of intensive research during the last
two decades. Some of the devices have matured into commercially useful products
and form part of modern electronic circuits. Some others require further development,
but have the promise of being useful commercially in the near future.
Study of the devices is, therefore, gradually becoming compulsory for electronics
specialists. The functioning of the devices, however, involve aspects of physics
which are not dealt with in the available text books on the physics of semiconductor
devices. There is, therefore, a need for a book to cover all these aspects at an
introductory level. The present book has been written with the aim of meeting
this need. In fact, the book grew out of introductory lectures given by the author
to graduate students and researchers interested in this rapidly developing area of
electron devices.