▁main stream ▁thin - film ▁P V ▁techn ologies , ▁the ▁other ▁two ▁being ▁cad m ium ▁tell ur ide ▁and ▁am orph ous ▁sil icon . ▁Like ▁these ▁materials , ▁C IG S ▁layers ▁are ▁thin ▁enough ▁to ▁be ▁flexible , ▁allowing ▁them ▁to ▁be ▁depos ited ▁on ▁flexible ▁substr ates . ▁However , ▁as ▁all ▁of ▁these ▁techn ologies ▁normally ▁use ▁high - temper ature ▁de position ▁techniques , ▁the ▁best ▁performance ▁normally ▁comes ▁from ▁cells ▁depos ited ▁on ▁glass , ▁even ▁though ▁adv ances ▁in ▁low - temper ature ▁de position ▁of ▁C IG S ▁cells ▁have ▁er ased ▁much ▁of ▁this ▁performance ▁difference . ▁C IG S ▁out per forms ▁pol ys il icon ▁at ▁the ▁cell ▁level , ▁however ▁its ▁module ▁efficiency ▁is ▁still ▁lower , ▁due ▁to ▁a ▁less ▁m ature ▁ups cal ing . ▁ ▁Th in - film ▁market ▁share ▁is ▁st agn ated ▁at ▁around ▁ 1 5 ▁percent , ▁leaving ▁the ▁rest ▁of ▁the ▁P V ▁market ▁to ▁conventional ▁solar ▁cells ▁made ▁of ▁cry st all ine ▁sil icon . ▁In ▁ 2 0 1 3 , ▁the ▁market ▁share ▁of ▁C IG S ▁alone ▁was ▁about ▁ 2 ▁percent ▁and ▁all ▁thin - film ▁techn ologies ▁combined ▁fell ▁below ▁ 1 0 ▁percent . ▁C IG S ▁cells ▁continue ▁being ▁developed , ▁as ▁they ▁promise ▁to ▁reach ▁sil icon - like ▁effic ien cies , ▁while ▁maintain ing ▁their ▁low ▁costs , ▁as ▁is ▁typical ▁for ▁thin - film ▁technology . ▁Prom