Garaafyada noocaan ah waxaa inta badan laga sameeyaa kookaha batroolka. Waa loo ogol yahay inay qaado cufnaanta hadda jirta in ka yar 12~14A/㎡. Guud ahaan waxa loo isticmaalaa foornada koronto ee tamarta caadiga ah samaynta birta, samaynta siliconka, samaynta fosfooraska jaalaha ah iwm.