A 7-Mask CMOS Process with Selective Oxide Deposition

Tadahiko Horiuchi, Tetsuya Homma, Yukinobu Murao, Koichiro Okumura

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


This paper describes a new 7-mask CMOS process using liquid phase oxide deposition which has selectivity against photoresist. The process modules for self-aligned well and one mask LDD formation are developed. The features of the process are 1) short TAT: 7 masks to first metallization, 2) self-aligned twin retrograde wells with 40% reduction of the p+-n+ spacing compared to conventional wells, and 3) optimal LDD design using different sidewall spacer width for n- and p-channel MOSFET’s giving a 10% larger on-current for p-channel MOSFET’s compared to a conventional process.

Original languageEnglish
Pages (from-to)1455-1460
Number of pages6
JournalIEEE Transactions on Electron Devices
Issue number8
Publication statusPublished - 1993 Aug
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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