United Microelectronics Corp. , which has once again become the world's second-largest chip foundry, said Wednesday that it will skip the 20 nm technology node as it aims to have 14nm FinFET tapeouts available for customers by the fourth-quarter of this year. The Hsinchu, Taiwan company's most advanced 28nm products accounted for 9% of its first-quarter revenue this year, ramping up from 7% in the fourth quarter last year as UMC gains a foothold in the technology node that larger rival Taiwan Semiconductor Manufacturing Co.