Structure based calculation for scanned field enhancement factor for CNT field emitters

The screening effect plays an important role when CNTs are placed in clustered and also have large effects in the calculation of field enhancement factor of clustered CNTs. Isolated CNT will have a greater field enhancement factor than the field enhancement factor cluster of CNTs because of screening effect. The screening effect is a function of distance between CNTs and length of CNTs. By using the expression for the field enhancement factor (β) of CNTs in cluster (under any position), we have proposed a structure for cluster of CNTs in lieu to get the uniform field enhancement factor of all the CNTs present in that cluster.