PROPERTIES OF CUINSE2 THIN-FILMS PREPARED BY CHEMICAL SPRAY-PYROLYSIS

CuInSe2 thin films have been prepared by chemical spray pyrolysis (CSP ). Effects of substrate temperature (T(s)), pH and the ion ratio (Cu/I n) in the spray solution on the film properties have been investigated , and the following results have been obtained; (i) films deposited wi th neutralized solution (pH = 4.0) exhibited chalcopyrite structure in contrast to those deposited with unneutralized one (pH = 1.9) having sphalerite structure, (ii) resistivity increased with T(s) for films d eposited with the unneutralized solution, while decrease of the resist ivity was observed for the neutralized case, and (iii) remarkable incr ease of resistivity with decreasing Cu/In has been observed. Finally, the effect of pH on the rectifying property in the CuInSe2/CdS heteroj unction has been presented.