A detector module for detecting photons includes a detector formed from a semiconductive material, the detector having a first surface, an opposing second surface, and a plurality of sidewalls extending between the first and second surfaces, and a guard band coupled to the sidewalls, the guard band having a length that extends about a circumference of the detector, the guard band having a width that is greater than a thickness of the detector such that an upper rim segment of the guard band projects beyond the first surface of the detector, the upper rim segment being folded over a peripheral region of the first surface along the circumference of the detector, the guard band configured to reduce recombinations proximate to the edges of the detector.