Transitions at energies of 1.31 eV and 1.41 eV have been observed in Zn, P, at room temperature (T = 295 K) by using surface photovoltage (SPY) spectroscopy. Results obtained from absorption and photoconductivity measurements are also discussed here. The polarity of the SPY signal h a s been analysed. Two acceptor levels were found to be at 0.29 eV and 0.19 eV above the valence band 'This paper was partly prepared under contract from the Ministry of National Education, and supported by Grant No 22338 9101 ( 2031127/1/1-9) from the Polish Research Committee.