PATENT CLAIM ANALYSIS

Application Number: 16017495
Application Type: Utility
Filing Date: 2018-06
Publication Date: 2018-10
Patent Classification: ["257", "051000"]

Abstract:
A bipolar transistor is described. In accordance with one aspect of the present invention the bipolar transistor comprises a semiconductor body including a collector region and a base region arranged on top of the collector region. The base region has a first crystalline structure and is at least partly doped with dopants of a first doping type. The collector region is laterally enclosed by a trench isolation and is doped with dopants of a second doping type. The transistor further comprises a conductive base contact layer laterally enclosing the base region which is doped with dopants of the first doping type. The base contact layer comprises a part with the first crystalline structure and a part with a second crystalline structure, wherein the part with the second crystalline structure laterally encloses the part with the first crystalline structure. The transistor further comprises an emitter region arranged on the base region, wherein the emitter region is doped with dopants of the second doping type and forming a pn-junction with the base region.

Claim (Index 11):
A method for fabricating a bipolar transistor (BT), the method comprising:\n forming a semiconductor body comprising a buried contact region and deep trench isolation (DTI); forming shallow trenches through a first semiconductor layer to expose the buried contact region and filling the shallow trenches, at least in part, to form a shallow trench isolation (STI) structure laterally surrounding a remaining portion of the first semiconductor layer; depositing a base contact layer on the filled shallow trenches and the first semiconductor layer, such that the base contact layer comprises an inner portion comprising a monocrystalline structure, wherein the inner portion is located directly over the first semiconductor layer and laterally between an outer portion, wherein the outer portion comprises a polycrystalline structure formed directly over the STI structure and in a same first horizontal plane as the inner portion; doping the base contact layer such that no doping atoms penetrate to the first semiconductor layer through the base contact layer inner portion and outer portion; forming an insulation layer over the base contact layer and forming an opening that penetrates at least to the first semiconductor layer such that: walls of the opening comprise the insulating layer and the inner portion of the base contact layer that remain under the insulating layer, and a floor of the opening is the first semiconductor layer, wherein a horizontal dimension of the inner portion is configured to prevent dislocations diffusing laterally from the outer portion through the inner portion as far as the walls of the opening; forming a collector region in the first semiconductor layer, wherein:\n the collector region is located in a same second horizontal plane and laterally between remaining portions of the first semiconductor layer, wherein a width of the collector region less than a width of the walls of the opening, and \n the inner portion of the base contact region is protected from implantation exposure from the forming of the collector region; \n forming a monocrystalline base region such that the monocrystalline base region forms electrical contact with the inner portion, is self-aligned with the inner portion and is in the same first horizontal plane as the inner portion and outer portion; and forming an emitter region on top of the base region.

Metadata:
- Claim Count in Document: 2.0
- Percentile: 94.0
- Lexical Diversity: 3.05085
- Patent Class: 257.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['14860431', '15449199', '14267651', '10496531', '14556352']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.9121243610647668
- 35 USC 102 Novelty (BERT): 0.5564946857764974
- Combined Prediction Score: 0.8765613935359399
- Mean Citation Score: 317.34478
- Max Citation Score: 412.15997
- Similarity Product: 370.35524800623057

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

Dataset: test