i have checked its data sheet and its photo-sensitivity (S) is upto 830nm ,so what do you suggest further.
where as i am using an IR of wavelength 980nm
Yes, mohamed.hagag was quoting this datasheet, too. Apparently he thinks (as me) that the photo diode is perfectly suited for your application. Almost any available silicon photo diode has a sensitivity maximum around 950 µm. What's your conclusion from the datsheet?