Semiconductor device and insulated gate bipolar transistor with barrier regions
First Claim
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1. A semiconductor device, comprising:
- a barrier region sandwiched between a drift region and a charge carrier transfer region, the barrier and charge carrier transfer regions forming a pn junction and the barrier and drift regions forming a homojunction, wherein an impurity concentration in the barrier region is at least ten times as high as an impurity concentration in the drift region; and
a control structure configured to form an inversion layer in the drift and barrier regions in an inversion state and to form no inversion layer in the drift and barrier regions in a non-inversion state.
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Abstract
In a semiconductor device a barrier region is sandwiched between a drift region and a charge carrier transfer region. The barrier and charge carrier transfer regions form a pn junction. The barrier and drift regions form a homojunction. A mean impurity concentration in the barrier region is at least ten times as high as an impurity concentration in the drift region. A control structure is arranged to form an inversion layer in the drift and barrier regions in an inversion state. No inversion layer is formed in the drift and barrier regions in a non-inversion state.
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Citations
20 Claims
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1. A semiconductor device, comprising:
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a barrier region sandwiched between a drift region and a charge carrier transfer region, the barrier and charge carrier transfer regions forming a pn junction and the barrier and drift regions forming a homojunction, wherein an impurity concentration in the barrier region is at least ten times as high as an impurity concentration in the drift region; and a control structure configured to form an inversion layer in the drift and barrier regions in an inversion state and to form no inversion layer in the drift and barrier regions in a non-inversion state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An insulated gate bipolar transistor, comprising:
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a transistor cell; and an auxiliary cell comprising a barrier region sandwiched between a drift region and a charge carrier transfer region, the barrier and charge carrier transfer regions forming a pn junction and the barrier and drift regions forming a homojunction, wherein an impurity concentration in the barrier region is at least ten times as high as an impurity concentration in the drift region. - View Dependent Claims (19)
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20. A semiconductor diode, comprising:
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a control structure extending from a first surface into a semiconductor body, the control structure comprising a control electrode and a control dielectric between the semiconductor body on a first side and the control electrode at a second side opposite to the first side; and a barrier region sandwiched between a drift region and a charge carrier transfer region in the semiconductor body, the barrier and charge carrier transfer regions forming a pn junction and the barrier and drift regions forming a homojunction, wherein an impurity concentration in the barrier region is at least ten times as high as an impurity concentration in the drift region.
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Specification