A capacitive Frisch grid structure for CdZnTe detectors

Recent results with CdZnTe (CZT) gamma spectrometers have shown that Frisch grid structures lead to excellent performances. Hole trapping problems have been solved by this mean. Some difficulties remain in order to optimize performance in terms of electronic noise and response uniformity. Frisch grid structures also stay hard to manufacture at an industrial scale because of their complexity. We present here some results obtained with a new Frisch grid structure based on capacitive coupling. Extremely easy to produce, it makes possible a highly efficient detector screening without leakage current increase.