Abstract
The precise measurements of absorption coefficients near the pseudodirect band edge in ZnSiP2 have been performed using the polarized light at 2 K. The absorption peak for the excited state (n=2) of A' exciton has for the first time been observed at 2.143 eV with the light polarized perpendicular to c-axis (E⊥c). Using the photon energies of An=1' exciton peak (ground state) and An=2' peak, the exciton binding energy and the reduced mass were determined to be 27 meV and 0.224m0, respectively. These values are slightly larger than those obtained theoretically.