Semiconductor device
View Patent ↗A semiconductor device, such as a memory device or radiation detector, is disclosed, in which data storage cells are formed on a substrate. Each of the data storage cells includes a field effect transistor having a source, drain, and gate, and a body arranged between the source and drain for storing electrical charge generated in the body. The magnitude of the net electrical charge in the body can be adjusted by input signals applied to the transistor, and the adjustment of the net electrical charge by the input signals can be at least partially cancelled by applying electrical voltage signals between the gate and the drain and between the source and the drain.
1. A semiconductor memory cell including at least one transistor to constitute the memory cell, the at least one transistor of the memory cell comprising:
a source region;
a drain region;
a body region disposed between the source region and the drain region, wherein the body region is electrically floating; and
a gate disposed over the body region; and
wherein the memory cell includes:
a first data state representative of a first charge in the body region; and
a second data state representative of a second charge in the body region
wherein the second charge is substantially provided by removing charge from the body region through the source region.
2. The memory cell of claim 1 wherein the first charge is comprised of an accumulation of majority carriers in the body region.
3. The memory cell of claim 2 wherein the body region is comprised of a P-type semiconductor material and the source and drain regions are comprised of an N-type semiconductor material.
4. The memory cell of claim 2 wherein the majority carriers accumulate in a portion of the body region that is adjacent to the source region.
5. The memory cell of claim 1 wherein positive voltages are applied to the drain region and the gate to provide the second charge in the body region.
6. The memory cell of claim 1 wherein positive voltages are applied to the drain region and the gate to remove at least the first charge from the body region.
7. The memory cell of claim 6 wherein, in response to positive voltages being applied to the drain region and the gate, the translator of the memory cell includes a junction between the body region and the source region, wherein the junction is forwarded biased.
8. The memory cell of claim 6 wherein, in response to the positive voltages being applied to the drain region and the gate, the transistor of the memory cell includes a forward bias current between the body region and the source region.
9. The memory cell of claim 6 wherein the second charge is stored in the body region in response to removing the positive voltages from the drain region and the gate.
10. A semiconductor memory cell including at least one transistor to constitute the memory cell, the at least one transistor of the memory cell comprising:
a source region having impurities to provide a first conductivity type;
a drain region having impurities to provide the first conductivity type;
a body region disposed between the source region and the drain region wherein the body region is electrically floating and includes impurities to provide a second conductivity type wherein the second conductivity type is different from the first conductivity type;
a gate disposed over the body region;
wherein the memory cell includes:
a first data state representative of a first charge in the body region wherein the first charge is substantially provided by impact ionization; and
a second data state representative of a second charge in the body region wherein the second charge is substantially provided by removing charge from the body region through the source region.
11. The memory cell of claim 10 wherein the first charge is comprised of majority carriers and wherein the second conductivity type is a P-type.
12. The memory cell of claim 10 wherein, in response to a first positive voltage applied to the drain region and a second positive voltage applied to the gate, at least the first charge is removed from the body region through the source region.
13. The memory cell of claim 12 wherein the memory cell, in response to the first and second positive voltages, includes a junction between the body region and the source region which is forwarded biased.
14. The memory cell of claim 13 wherein the first conductivity type is an N-type.
15. The memory cell of claim 14 wherein the second charge is stored in the body region in response to removing the first positive voltage from the drain region before removing the second positive voltage from the gate.
16. The memory cell of claim 14 wherein, in response to the first and second positive voltages, the transistor includes a forward bias current between the body region and the source region.
17. The memory cell of claim 16 wherein the second charge is stored in the body region in response to removing the first positive voltage from the drain region and the second positive voltage from the gate.
18. The memory cell of claim 10 wherein the first charge is stored in the body region in response to applying a first negative voltage to the drain region and a second negative voltage to the gate.
19. The memory cell of claim 18 wherein the transistor of the memory cell stores the first charge in a portion of the body region that is adjacent to the source region.
20. A semiconductor memory cell including at least one transistor to constitute the memory cell, the at least one transistor of the memory cell comprising:
a source region having impurities to provide a first conductivity type;
a drain region having impurities to provide the first conductivity type;
a body region disposed between the source region and the drain region wherein the body region is electrically floating and includes impurities to provide a second conductivity type wherein the second conductivity type is different from the first conductivity type;
a gate spaced apart from, and capacitively coupled to, the body region;
wherein the memory cell includes:
a first data state representative of a first charge in the body region; and
a second data state representative of a second charge in the body region wherein the second charge is substantially provided by removing charge from the body region through the source region.
21. The memory cell of claim 20 wherein, in response to a first voltage applied to the drain region and a second voltage applied to the gate, the first charge is removed from the body region through the source region.
22. The memory cell of claim 21 wherein, in response to removing the first voltage from the drain region before removing the second voltage from the gate, the second charge is stored in the body region.
23. The memory cell of claim 21 wherein the second charge is stored in the body region in response to applying ground to the drain region before removing the second voltage from the gate.
24. The memory cell of claim 21 wherein the first voltage and the second voltage are positive voltages which, during operation, are applied for a finite duration.
25. The memory cell of claim 21 wherein the transistor, in response to the first voltage and the second voltage, includes a junction between the body region and the source region which is forwarded biased.
26. The memory cell of claim 25 wherein the first voltage and the second voltage are positive voltages which are applied for a finite duration.
27. The memory cell of claim 26 wherein, in response to the positive voltages being applied to the drain region end the gate, the transistor includes a forward bias current between the body region and the source region.
28. The memory cell of claim 27 wherein the transistor stores the second charge in the body region in response to a third voltage being applied to the drain region before a fourth voltage is applied to the gate.
29. The memory cell of claim 28 wherein the third and fourth voltages are ground.
30. The memory cell of claim 21 wherein the transistor stores the first charge in a portion of the body region that is adjacent to the source region.
31. The memory cell of claim 30 wherein the first charge is substantially provided by impact ionization.
32. The memory cell of claim 21 wherein, in response to a first positive voltage applied to the drain region and a second positive voltage applied to the gate, more than the first charge is removed from the body region through the source region.
33. The memory cell of claim 32 wherein the first positive voltage is less than the second positive voltage.