PMID- 23858846 OWN - NLM STAT- MEDLINE DCOM- 20130801 LR - 20190715 IS - 1533-4880 (Print) IS - 1533-4880 (Linking) VI - 13 IP - 5 DP - 2013 May TI - A four-bit-per-cell program method with substrate-bias assisted hot electron injection for charge trap flash memory devices. PG - 3293-7 AB - We propose a four-bit-per-cell program method using a two-step sequence with substrate-bias assisted hot electron (SAHE) injection into the charge trap flash memory devices in order to overcome the limitations of conventional four-bit program methods, which use channel hot electron (CHE) injection. With this proposed method, a localized charge injection near the junction edge with an acceptable read margin was clearly observed, along with a threshold voltage difference of 1 V between the forward and the reverse read. In addition, a multi-level storage was easily obtained using a drain voltage step of 1 V at each level of the three programmed states, along with a fast program time of 1 micros. Finally, by using charge pumping methods, we directly observed the detailed information on the spatial distribution of the local threshold voltage in each level of the four states, for each physical bit, as a function of the program voltage. FAU - An, Ho-Myoung AU - An HM AD - School of Electrical Engineering, Korea University, Anam-dong 5-ga, Seoul 136-701, Korea. FAU - Kim, Hee-Dong AU - Kim HD FAU - Kim, Byungcheul AU - Kim B FAU - Kim, Tae Geun AU - Kim TG LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - United States TA - J Nanosci Nanotechnol JT - Journal of nanoscience and nanotechnology JID - 101088195 SB - IM MH - *Computer Storage Devices MH - Electron Transport MH - Equipment Design MH - Equipment Failure Analysis MH - Information Storage and Retrieval/*methods MH - Molecular Conformation MH - Nanotechnology/*instrumentation MH - Signal Processing, Computer-Assisted/*instrumentation MH - Static Electricity EDAT- 2013/07/19 06:00 MHDA- 2013/08/02 06:00 CRDT- 2013/07/18 06:00 PHST- 2013/07/18 06:00 [entrez] PHST- 2013/07/19 06:00 [pubmed] PHST- 2013/08/02 06:00 [medline] AID - 10.1166/jnn.2013.7242 [doi] PST - ppublish SO - J Nanosci Nanotechnol. 2013 May;13(5):3293-7. doi: 10.1166/jnn.2013.7242.