Ion Microbeam Studies of Charge Transport in Semiconductor Radiation Detectors With Three-Dimensional Structures: An Example of LGAD

Abstract

The development of semiconductor detectors with an increased tolerance to high radiation levels often results in devices that deviate significantly from those of the classical design with planar electrodes. Decreasing the charge drift distance and/or introducing localised charge multiplication volumes are two detector development strategies that are often used in an attempt to increase the device radiation hardness. However, such approaches result in a more complex three-dimensional distribution of electrodes and sensitive detector volumes, which presents a challenge for the microscopic characterisation of charge transport properties. IBIC (ion beam-induced charge) is one of the available microscopic characterisation techniques that utilises focused, MeV energy range ions to probe charge transport. Here we used IBIC to probe different detector depths by varying the ion energy and/or angle of incidence and to probe certain detector regions by ions of the same range but with different stopping powers. These investigations are particularly important for studying low gain avalanche diode (LGAD) detectors, where measured interpad distances change with proton energy and where an increased carrier density results in changes in the charge multiplication, which are studied in this work.

New insight into gain suppression and single event Burnout effects in LGAD

“…The second part of this paper, devoted to GS, is also complementary to our previously published results [6,7]. The main findings of previous studies can be summarized as follows: (1) Gain decreases as carrier density increases; (2) GS is caused by the space charge effect, i.e., electric field screening; (3) GS is more noticeable in non-irradiated LGADs than in irradiated LGADs; (4) The structure of the probing beam and ion's ionization profile affect the GS.…”

Analysis of the performance of low gain avalanche diodes for future particle detectors

“…However, there are some differences. For example, When it comes to the creation of electron-hole pairs, the laser beam usually operates within a cylinder with a diameter of approximately 10 μm (depending on the laser optics) but for a MIP, this diameter is considerably smaller, leading to more significant screening effects [1,12,23,24,[37][38][39][40][41][42][43][44][45]. BNL LGADs were used for this study.…”