One abnormal semen analysis does not diagnose a male problem. You need at least 2 abnormal at least 70 days apart to make a diagnosis. It takes at least 70 days to get a new batch of sperm to test. If your husband's morphology was normal 1 year ago by strict morphology, then I think you can consider trying lesser treatment then IVF/ICSI (intracytoplasmic sperm injection) like IUI. However, with 0% normal and if before there was not a strict morphology done, then IVF/ICSI would be the fastest and most effective treatment for you and your husband.
I would recommend that your husband avoid heat ie hot tubs, saunas, bicycling, avoid alcohol and tobacco and take a multivitamin with antioxidant with Vit A, C, E, Selenium and Zinc. He can try FertilityBlend for Men which also contains B vitamins, ferrulic acid, green tea extract and L-carnitine.
(And just a head's up that strict morphology, or the Kruger method was used for his test)