  We present measurements of electron and hole trapping in three COSI germanium
cross-strip detectors. By characterizing the relative charge collection
efficiency (CCE) as a function of interaction depth, we show that intrinsic
trapping of both electrons and holes have significant effects on the
spectroscopic performance of the detectors. We find that both the electron and
hole trapping vary from detector to detector, demonstrating the need for
empirical trapping measurements and corrections. Using our measurements of
charge trapping, we develop a continuous depth-dependent second-order energy
correction procedure. We show that applying this empirical trapping correction
produces significant improvements to spectral resolution and to the accuracy of
the energy reconstruction.
