4 семестр / Теория / Транзисторы

4 ( # * A$'$' (

'

$

)

$

d!$ $

; K

'

" ;

K '

# = ( *

d * *

G )++ , ,

>)++ )

γ =	In	=		In	→1
			In
	I			+ I p		e

" G )++ ,

B= In →1e

In

# G )++ , ,

M =		I		=		In + I p	< 1 (= 1) e
	Ink					Ink
d G )++ , )$(
αF =		Ik			U =0 KfcK
		I

αF = γ × B M

αF < 1e

F 4$ $( )

β

F

=

I

U =0

I

= I

− I

β

F

=

αF

α

F

=

βF

I

1

−αF

1

+ βF

,

-'

(

1 ) ghih A )++ , ($ $ $(

( )

αF = 1+ββF F βF = 1−ααF F

α

F

=

Ik

U =0=const

β

F

=

I

U = 0 = co n st

I

I

gh?0'j!0'jjk

4$(

ih? 0!F00!$

4$( )

1 / 1

1 ( (

L e

" O, >e # 1 ) * 9 )$e

d , , ,$ $% &$e F G , ,% &e

l J ) 3 ++ $

e

W ($ )$e

k : ( 3

	@K?@&)_@%)
	@G?!@& !@%
	@c?@K!@G
	I = eS(	Dnnp	+	D p		eU	) −1) !
				n n0 )(exp(
		L				kT
				L	p
		n

H$($)

%!&$= )$ )

' m nno

I p	= eS	Dp		pno (exp(	eU	) −1)
		Lp
					kT
I p	= eS	Dp		pno (exp(	eU	) −1)
		Lp
					kT

1 , ++

∂np

∂t

∂np

∂t

7 )

= −	n		(t) − n	0	+ D	∂2n		(t)
			τn
					n	δ t2

O , >

= 0 n (t) ! , ,

∂2n		(t)	=	n		(t)
∂t2				L		2
					n
n (x) = Aexp(−							x	) + B exp(	x	) ' ; 1 A Yp&qa'$ $
							Lu		Lu

5 , , , K

, , 1 , , )

= ) :$

1 , ,3' 3 ++

; !

G ) 3 ' 3

)

O (

3 '$ $

O

) '$

)

1 K !L

I

= I

0

exp(

eU

) −1 −α

R

I

0

exp(

eU

) −1

kT

kT

I

= α

F

I

0

exp(

eU

) −1 − I

0

exp(

eU

) −1

! )

kT

kT

$

gh! )++ , e gb! )++ ,

= eS

Dp pn

+

Dn np

×

ch(W / L

)

I 0

n

Lp

Ln

sh(W / Ln )

= eS

Dp pn

+

Dn np

×

ch(W / L

)

I 0

n

Lp

Ln

sh(W / Ln )

αR I 0 = αF I 0 = eS

Dn n

L sh(W / L )

αF

=

αF I 0

I 0

D

p

W

1

W

αF

=

1-

×

×

-

(

)2

D

2

n

L 0

L

αF ®1 W L !

αF ®1 p np n p

γ = 1- D × p × W

D n L

B = 1- 1 (W )2

2 L

	D		p		W		1		W
αR = 1-		×		×		-		(		)2
	D				L		2		L
			n

αR ® 0 p np n < p N < N

c '

2 / , 3

I = I 0 exp(

eU

)

kT

I = αF I 0

exp(

eU

)

I = αF × I

kT

I

1

= I

0

exp(

eU

) −1

kT

I

2

= I

0

exp(

eU

) −1

kT

	Iý = I1 −αR I2
								L K !L "$'$' J$' )
	I	ê	= a	F	I	− I	2
					1
	@ @"A'gh' @ ' @"A
					L K !L$
								! ( , , , "#$.

1$( (

I = f (U ) I

1$($

I = f (U ) I

)

3$

1 L$

> 1

3 )++ K

/44 , /

3 * 9' 3

)++3$ ?/

> J ,

" , ,

1 ( >fcG/0) 3 0' 1

>fcGn0) J )++ K

! & 5

%

=≈ 0'W!0'k 1f) ≈ 0'l!0'F 1$! J rrrr

J (

1$ '$( '

f)J )$'

$!) ' )

@G f' 3 '$

(

.

1 .

LH ! ' L$

A+

6 &! e %! e J e

f ?0 f ?_

1 . ,

_'$!' ,

A sJ 1

) 3 ' 3 ! ) f &!

' f ' , , )

f /f _f ( sJ J

$sJ ; (

3 J '$N

''

J fY/>f !f

fY?>f !f

f !f ?f !f ! f

) 0' ) (J

) * ) J

1$ $

1 (

@Y?]>f !f "

1 . ,

G ( f ?0

)

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