Double sided strip monolithic silicon E– [formula omitted] telescope produced by Quasi-Selective Epitaxy

Abstract

The problem of cross-talks (induction of signals) from the E detector to the Δ E detector in a monolithic E– Δ E telescope was solved by choosing an appropriate geometry of the telescope. It was shown by solving the telegraphic equation, which describes the time-dependent evolution of induced signals in the Δ E detector RC line, that for long and narrow monolithic telescopes the induced signals (cross-talks) were suppressed. These results are experimentally supported by measurements of α particles with a circular monolithic E– Δ E telescope. When α particles were measured at the telescope edge, the induced signal (cross-talk) was decreased. For α particles measured at the center of the telescope the amplitude of cross-talk was higher. Applying these results we have designed a new type of device based on the n + –n– p + –n– n + structures: double-sided strip monolithic silicon E– Δ E telescope. The device is similar to the traditional double sided strip detector, however, an introduced p + -type buried grounded separating layer isolates the (upper) Δ E strip detector from the (bottom) E strip detector of the telescope.