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(a) Side view showing the structure of HARP-AMFPI. The a-Se photoconductor is used to detect x rays and convert them to charge in the drift region. Holes undergo avalanche multiplication in the gain region and are collected at the del electrodes. Shaded area denotes region of a single del. Electric field lines are shown as continuous lines. (b) Top view of the HARP-AMFPI structure. The square area (dotted line) at the top denotes the region of a single del.
