ABSTRACT
Ferroelectric field effect transistor (FeFET) memories with hafnium zirconium oxide (HZO) ferroelectric gate dielectric and ultrathin InOxchannel exhibit promising applicability in monolithic three-dimensional (M3D) integrated chips. However, the inferior stability of the devices severely limits their applications. In this work, we studied the effect of single cycle of atomic-layer-deposited Al-O bonds repeatedly embedded into an ultrathin InOxchannel (â¼2.8 nm) on the Hf0.45Zr0.55OxFeFET memory performance. Compared to the pure InOxchannel, three cycles of Al-O bonds modified InOxchannel (IAO-3) generates a much larger memory window (i.e. drain current ratio between the programmed and erased devices) under the same program conditions (+5.5 V/500 ns), especially after post-annealing at 325 °C for 180 s in O2(1238 versus 317). Meanwhile, the annealed IAO-3 FeFET memory also shows quite stable data retention up to 104s, and much more robust program/erase stabilities till 105cycles. This is because the modification of strong Al-O bonds stabilizes the oxygen vacancies and reduces the bulk trap density in the channel. Furthermore, it is indicated that the program and erase efficiencies increase gradually with reducing the channel length of the memory device. By demonstrating markedly improved performance of the HZO FeFET memory with the ultrathin IAO-3 channel, this work provides a promising device for M3D integratable logic and memory convergent systems.
ABSTRACT
<p><b>OBJECTIVE</b>To investigate the clinicopathologic features and immunohistochemical of the basal-like subtype of invasive breast carcinoma (BLBC), and to discuss the diagnosis standard.</p><p><b>METHODS</b>Immunohistochemistry was performed in 448 cases of breast carcinoma and these cases were categorized into luminal A, luminal B, null subtypes, HER2-overexpressing and basal-like and their clinicopathologic features were observed under light microscope with stains of HE and immunohistochemical InVitrogen staining.</p><p><b>RESULTS</b>Among the breast cancer patients, the incidence of BLBC was 15.4% (69/448). Morphologic features significantly associated with BLBC constituently included nest structure and showing diffuse growth pattern, large scarring areas without cells in tumor, geographic necrosis, pushing margin of invasion, lymphocytic infiltrate in various degree in tumor stroma, syncytial tumor cell without clear boundaries, tumor cell showing vesicular unclear chromatin and nucleolus, markedly elevated mitotic count, metaplasia (all P < 0.01). Meanwhile, most BLBC showed strong immunoreactivity for CK5/6, CK14, CK17 (all P < 0.01).</p><p><b>CONCLUSION</b>BLBC showed distinct morphologic and immunophenotypic features.</p>
