«98 «
4. PHOTOELECTRIC EMISSION
:
as the voltage across the cell is increased. The straight line AB in
gure 4—17, is found to be parallel to but below the dark current line,
_
the displacement increasing as the intensity of the incident light is
_
‘
increased.
This may be summarized, roughly, by saying that the
'
“
leakage
”
current through and around the cell increases With
applied voltage and decreases With light intensity.
In general, the lines (AB) do not extrapolate back to the origin. The
“
leakage
”
currents are further complicated With an inverse cur_
rent due to electron emission from the
“
anode
”
(which is now
.
negative With respect
to
the sensitized surface).
These effects ‘
wprobably account for the reverse currents (—d) observed With
_
the commercial cell used.
Together With the thermal curvature
'
at the lower end of the photo—currents (BC), it is not to be expected
_
that the value AV in gure 4—17 is a precise value for use in
_
equation 4—12. However, with the method described, the student
Will obtain a value giving the correct order of magnitude of iz/e
and, probably, not in error by more than 10 per
cent.
…
.
REFERENCES
1. ’E. O. Lawrence and ]. W. Beams, Phys. Rev., 32, 478 (1928).
2. W. A. Zisman, Rev. Sci. Inst., 3, 367 (1932).
3. R. A. Millikan, Electrans (+ and —).
The University Of Chicago
Press (1935),
‘
.
-
4. A. L. Hughes, Rev. Mod. Phys., s, 294 (1936).
—
F. c. Nix, Rev. Mod.“ Phys., 4, 723 (1932).
5. ,L. o. Grondahl, Rev. Mod. Phys., 5, 141 (1933).
_
6. _]. Dumond and v. Bollman, Phys. Rev.“, 51, 400 (1937).
“
“B. Lange, D_ie Photaelemente, Part I. Barth (1936).
7
_
' j , . . €
GENERAL REFERENCES
_
A—A L'. Hughes and L. A. DuBridge. Photoeleæ‘ric Phenomena
',…1:;‘
Book Co., (1932).
.
J
B Lin—ford» Rev- Mod» Phys.. 5. 34 (1933)
_
C—HSlmon and R.Suhnann, Lichteleà‘rz‘sçhe Zellen. Springer,
7
'
,
__
_
_
ï
_
_
Ritchie. PhŒoelèæm‘e Cells. P1tman
—&Sons,(1929) ŸÏ Ï
E—VKZWOrYkmandED WsonPhw…æ Second Edmm
WIIÊY&SOHS>(1934)
7_
7
,
;
_
4. PHOTOELECTRIC EMISSION
:
as the voltage across the cell is increased. The straight line AB in
gure 4—17, is found to be parallel to but below the dark current line,
_
the displacement increasing as the intensity of the incident light is
_
‘
increased.
This may be summarized, roughly, by saying that the
'
“
leakage
”
current through and around the cell increases With
applied voltage and decreases With light intensity.
In general, the lines (AB) do not extrapolate back to the origin. The
“
leakage
”
currents are further complicated With an inverse cur_
rent due to electron emission from the
“
anode
”
(which is now
.
negative With respect
to
the sensitized surface).
These effects ‘
wprobably account for the reverse currents (—d) observed With
_
the commercial cell used.
Together With the thermal curvature
'
at the lower end of the photo—currents (BC), it is not to be expected
_
that the value AV in gure 4—17 is a precise value for use in
_
equation 4—12. However, with the method described, the student
Will obtain a value giving the correct order of magnitude of iz/e
and, probably, not in error by more than 10 per
cent.
…
.
REFERENCES
1. ’E. O. Lawrence and ]. W. Beams, Phys. Rev., 32, 478 (1928).
2. W. A. Zisman, Rev. Sci. Inst., 3, 367 (1932).
3. R. A. Millikan, Electrans (+ and —).
The University Of Chicago
Press (1935),
‘
.
-
4. A. L. Hughes, Rev. Mod. Phys., s, 294 (1936).
—
F. c. Nix, Rev. Mod.“ Phys., 4, 723 (1932).
5. ,L. o. Grondahl, Rev. Mod. Phys., 5, 141 (1933).
_
6. _]. Dumond and v. Bollman, Phys. Rev.“, 51, 400 (1937).
“
“B. Lange, D_ie Photaelemente, Part I. Barth (1936).
7
_
' j , . . €
GENERAL REFERENCES
_
A—A L'. Hughes and L. A. DuBridge. Photoeleæ‘ric Phenomena
',…1:;‘
Book Co., (1932).
.
J
B Lin—ford» Rev- Mod» Phys.. 5. 34 (1933)
_
C—HSlmon and R.Suhnann, Lichteleà‘rz‘sçhe Zellen. Springer,
7
'
,
__
_
_
ï
_
_
Ritchie. PhŒoelèæm‘e Cells. P1tman
—&Sons,(1929) ŸÏ Ï
E—VKZWOrYkmandED WsonPhw…æ Second Edmm
WIIÊY&SOHS>(1934)
7_
7
,
;
_