E-commerce can be defined as an activity to buy and sell goods and services electronically over the internet. It also involves transfer of data and money in order to execute these transactions and services. In today’s business world, companies need to build an effective customer churn prediction model in order to id...

The present subject matter at least illustrates a vertical tunnel field effect transistor (VTFET) 100. The VTFET comprises a source region 102 which in turn comprises a lower band-gap semiconductor-material. A drain region 104 comprises a higher band-gap semiconductor material, wherein said drain region 104 defines ...