, ▁is ▁dedicated ▁to ▁his ▁memory . ▁ ▁Trans istor ▁development ▁On ▁January ▁ 3 0 , ▁ 1 9 4 8 ▁Sh ive ▁discovered ▁that ▁gold - pl ated ▁t ung sten ▁point ▁contacts ▁on ▁a ▁p - type ▁layer ▁of ▁g erman ium ▁grown ▁on ▁an ▁n - type ▁substr ate ▁gave ▁" a ▁ter r ific ▁tri ode ▁effect ". ▁ ▁On ▁February ▁ 1 3 , ▁he ▁also ▁discovered ▁that ▁a ▁trans istor ▁consisting ▁of ▁bronze ▁contacts ▁on ▁the ▁surface ▁of ▁an ▁n - type ▁substr ate ▁without ▁a ▁p - layer ▁gave ▁" g ains ▁up ▁to ▁ 4 0 × ▁in ▁power !" ▁ ▁He ▁lever aged ▁this ▁discovery ▁to ▁build ▁a ▁point ▁contact ▁trans istor ▁with ▁bronze ▁contacts ▁on ▁the ▁front ▁and ▁back ▁of ▁thin ▁w edge ▁of ▁g erman ium , ▁prov ing ▁that ▁holes ▁could ▁diff use ▁through ▁bulk ▁g erman ium ▁and ▁not ▁just ▁along ▁the ▁surface ▁as ▁previously ▁thought . ▁This ▁confirmed ▁William ▁Sho ck ley ' s ▁idea ▁that ▁it ▁should ▁be ▁possible ▁to ▁build ▁a ▁j unction ▁trans istor , ▁an ▁idea ▁that ▁h ither to ▁he ▁had ▁kept ▁secret ▁from ▁the ▁rest ▁of ▁the ▁team . ▁ ▁Sho ck ley ▁later ▁admitted ▁that ▁the ▁work ings ▁of ▁the ▁team ▁were ▁" mi xture ▁of ▁co operation ▁and ▁competition ". ▁He ▁also ▁admitted ▁that ▁he ▁kept ▁some ▁of ▁own ▁work ▁secret ▁until ▁his ▁" hand ▁was ▁forced " ▁by ▁Sh ive ' s ▁ 1 9 4 8 ▁advance .