公开(公告)号：DE10344862A1

公开(公告)日：2004-04-15

申请号：DE10344862

申请日：2003-09-26

Applicant: INFINEON TECHNOLOGIES AG ,  IBM

Inventor： DIVAKARUNI RAMACHANDRA ,  FEHLAUER GERD T ,  KUDELKA STEPHAN ,  MANDELMAN JACK A ,  SCHROEDER UWE ,  TEWS HELMUT

IPC: H01L21/334 ,  H01L21/8242 ,  H01L27/108 ,  H01L29/94

Abstract: A trench capacitor memory cell structure is provided with includes a vertical collar region that suppresses current leakage of an adjacent vertical parasitic transistor that exists between the vertical MOSFET and the underlying trench capacitor. The vertical collar isolation, which has a vertical length of about 0.50 mum or less, includes a first portion that is present partially outside the trench and a second portion that is present inside the trench. The first portion of the collar oxide is thicker than said second portion oxide thereby reducing parasitic current leakage.

公开(公告)号：DE10344862B4

公开(公告)日：2007-12-20

申请号：DE10344862

申请日：2003-09-26

Applicant: INFINEON TECHNOLOGIES AG ,  IBM

Inventor： DIVAKARUNI RAMACHANDRA ,  FEHLAUER GERD T ,  KUDELKA STEPHAN ,  MANDELMAN JACK A ,  SCHROEDER UWE ,  TEWS HELMUT

IPC: H01L27/108 ,  H01L21/334 ,  H01L21/8242 ,  H01L29/94

Abstract: A trench capacitor memory cell structure is provided with includes a vertical collar region that suppresses current leakage of an adjacent vertical parasitic transistor that exists between the vertical MOSFET and the underlying trench capacitor. The vertical collar isolation, which has a vertical length of about 0.50 mum or less, includes a first portion that is present partially outside the trench and a second portion that is present inside the trench. The first portion of the collar oxide is thicker than said second portion oxide thereby reducing parasitic current leakage.