3D chip stacking with C4 technology.
Bing DangSteven L. WrightPaul S. AndryEdmund J. SprogisCornelia K. TsangM. John InterranteBucknell C. WebbRobert J. PolastreRaymond R. HortonChirag S. PatelArun SharmaJ. ZhengKatsuyuki SakumaJohn U. KnickerbockerPublished in: IBM J. Res. Dev. (2008)