PATENT CLAIM ANALYSIS

Application Number: 16112640
Application Type: Utility
Filing Date: 2018-08
Publication Date: 2018-12
Patent Classification: ["257", "190000"]

Abstract:
A structure of SiGe source/drain and a preparation method thereof are disclosed in the present invention. Firstly, providing a semiconductor single crystal silicon substrate. Secondly, etching the semiconductor single crystal silicon substrate to form recesses on both sides of the gate. Thirdly, epitaxially growing a SiGe seed layer and a SiGe bulk layer in the recesses in turn. Fourthly, subjecting the SiGe bulk layer to a crystal plane treatment with a mixed-gases. Fifthly, epitaxially growing a lattice change layer on the SiGe bulk layer. Finally, epitaxially growing a cap layer on the lattice change layer. The preparation method of the present invention can greatly improve the morphology of the SiGe epitaxy in the incomplete Un-tuck structure, and promote the formation of the subsequent metal silicide (NiSi), so that problems such as abnormal resistance and leakage of active area (AA leakage) can be effectively prevented.

Claim (Index 1):
A structure of SiGe source/drain, comprising:\n a semiconductor single crystal silicon substrate, having a prepared gate and two recesses on both sides of the gate respectively; a SiGe seed layer and a SiGe bulk layer, epitaxially grown in the recesses in turn, and the SiGe bulk layer is subjected to a crystal plane treatment with a mixed-gases; the crystal plane treatment comprises simultaneous etching of the SiGe bulk layer surface and growth of a new SiGe bulk layer, wherein, the etching rate of the SiGe bulk layer surface is larger than the growth rate of the new SiGe bulk layer; the mixed gases include SiH 4 , SiH 2 Cl 2 , HCl, H 2 , B 2 H 6  and GeH 4 ; a lattice change layer, epitaxially grown on the top of the treated SiGe bulk layer and located in the recesses or on the top surface of the recesses; the growth of the lattice change layer comprises simultaneous etching of the SiGe bulk layer surface and growth of the lattice change layer, wherein, the etching rate of the SiGe bulk layer surface is smaller than the growth rate of the lattice change layer; a cap layer, epitaxially grown on the top surface of the lattice change layer and the SiGe bulk layer.

Metadata:
- Claim Count in Document: 7.0
- Percentile: 96.0
- Lexical Diversity: 2.0
- Patent Class: 257.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['15390528', '13914442', '10845984', '12201681', '11539775']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.9277309310432644
- 35 USC 102 Novelty (BERT): 0.5500390616195584
- Combined Prediction Score: 0.8899617441008937
- Mean Citation Score: 279.369804
- Max Citation Score: 431.06757000000016
- Similarity Product: 322.7373189821256

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 0
- Claim Label 112: 0
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test