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SEMI CONDUCTORS

difference between intrinsic and extrinsic semicondutors

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SEMI CONDUCTORS
GOLI AKSHAYA SAI SREE
23BD1A1219
IT-A
SEMI-CONDUCTORS
•THE SOLIDS HAVING PROPERTY INTERMEDIATEBETWEEN CONDUCTORINSULATORS.
•THEY USUALLY DEPENDS UPON THE TEMPERATURE
E.G.. IF TEMPERATURERISES CONDUCTIVITYOF MATERIAL INCREASES AND IF TEMPERATURE
DECREASES THENCONDUCTIVITY DECREASES
TYPES OF SEMI-CONDUCTORS
• THERE ARE TWO TYPES OF SEMI-CONDUCTORS:
1.INTRINSIC SEMI-CONDUCTORS
•SEMI CONDUCTORS WHICH ARE IN PURE FORM.
EX: PURE GERMANIUM AND SILICON.
•IN INTRINSIC SEMICONDUCTORS THE NUMBER OF EXCITED
ELECTRONS AND THE NUMBER OF HOLES ARE EQUAL:N=P
2.EXTRINSIC SEMI-CONDUCTORS
•SEMI CONDUCTORS WHICH ARE IN IMPURE FORM
•THEY ARE FORMED BY DOPING IMPURITIES IN INTRINSIC
SEMI CONDUCTORS IN ORDER TO INCREASE THE
CONDUCTIVITY.
EX: SILICON AND GERMANIUM DOPED WITHALUMINIUM,
ARSENIC,
PHOSPHORUS AND INDIUM.
TYPES OF EXTRINSIC SEMI-CONDUCTORS
THERE ARE TWO TYPES OF EXTRINSIC SEMI CONDUCTORS
İ. N-TYPE SEMICONDUCTORS
İİ.P-TYPE SEMICONDUCTORS
N-TYPE SEMICONDUCTOR
THE SEMICONDUCTORS WHICH ARE FORMED BY ADDING A PENTVALENT IMPURITY TO A PURE SEMICONDUCTOR IS
CALLED N-TYPE SEMICONDUCTOR
PENTAVALENT
AN ATOM BELONG TO FIFTH GROUP IS A PENTAVALENT.
THEY ARE CALLED PENTAVALENT BECAUSE THEY HAVE FIVE(5) VALENCE ELECTRONS IN OUTER MOST SHELL.
EX:CARBON,PHOSPHORUS.

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SEMI CONDUCTORS

  • 1. SEMI CONDUCTORS GOLI AKSHAYA SAI SREE 23BD1A1219 IT-A
  • 2. SEMI-CONDUCTORS •THE SOLIDS HAVING PROPERTY INTERMEDIATEBETWEEN CONDUCTORINSULATORS. •THEY USUALLY DEPENDS UPON THE TEMPERATURE E.G.. IF TEMPERATURERISES CONDUCTIVITYOF MATERIAL INCREASES AND IF TEMPERATURE DECREASES THENCONDUCTIVITY DECREASES
  • 3. TYPES OF SEMI-CONDUCTORS • THERE ARE TWO TYPES OF SEMI-CONDUCTORS: 1.INTRINSIC SEMI-CONDUCTORS •SEMI CONDUCTORS WHICH ARE IN PURE FORM. EX: PURE GERMANIUM AND SILICON. •IN INTRINSIC SEMICONDUCTORS THE NUMBER OF EXCITED ELECTRONS AND THE NUMBER OF HOLES ARE EQUAL:N=P
  • 4. 2.EXTRINSIC SEMI-CONDUCTORS •SEMI CONDUCTORS WHICH ARE IN IMPURE FORM •THEY ARE FORMED BY DOPING IMPURITIES IN INTRINSIC SEMI CONDUCTORS IN ORDER TO INCREASE THE CONDUCTIVITY. EX: SILICON AND GERMANIUM DOPED WITHALUMINIUM, ARSENIC, PHOSPHORUS AND INDIUM.
  • 5. TYPES OF EXTRINSIC SEMI-CONDUCTORS THERE ARE TWO TYPES OF EXTRINSIC SEMI CONDUCTORS İ. N-TYPE SEMICONDUCTORS İİ.P-TYPE SEMICONDUCTORS
  • 6. N-TYPE SEMICONDUCTOR THE SEMICONDUCTORS WHICH ARE FORMED BY ADDING A PENTVALENT IMPURITY TO A PURE SEMICONDUCTOR IS CALLED N-TYPE SEMICONDUCTOR PENTAVALENT AN ATOM BELONG TO FIFTH GROUP IS A PENTAVALENT. THEY ARE CALLED PENTAVALENT BECAUSE THEY HAVE FIVE(5) VALENCE ELECTRONS IN OUTER MOST SHELL. EX:CARBON,PHOSPHORUS.
  • 7. P-TYPE SEMICONDUCTORS THE SEMICONDUCTORS WHICH ARE FORMED BY ADDING TRIVALENT IMPURITIES TO A PURE SEMICONDUCTORS ARE CALLED P-TYPE SEMICONDUCTOR TRIVALENT AN ATOM BELONGS TO THIRD GROUP IS A TRIVALENT ATOM. THESE ARE CALLED TRIVALENT BECAUSE THEY HAVE THREE VALENCE ELECTRON IN THE OUTER MOST SHELL EX:ALUMINUM,BORON.