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ELECTRICAL PROPERTIES OF ORGANIC SOLIDS. I. KINETICS AND MECHANISMOF CONDUCTIVITY OF METAL-FREE PHTHALOCYANINE
Techniques involving the use of high-intensity short-duration light pulses have been applied t o the study of the kinetics of photoconductivity in films of metal-free phthalocyanine. These experiments, in conjunction with measurements of steady-state photoconductivity, are consistent with the following scheme. The principal route for the formation of charge carriers is via the first excited singlet state, although the lowest triplet state can, t o some extent, contribute to charge - carrier production. The mobility of the carriers is low and is concentration-dependent, being lower at higher carrier concentration. The decay of the photocurrent is the result of a diffusion-limited bimolecular recombination, with a capture radius of approximately one molecular diameter. The experiments indicate that carriers produced thermally in the dark do not interact with light-produced carriers.
Date:
July 29, 1959
Creator:
Tollin, Gordon; Kearns, David R. & Calvin, Melvin.
Object Type:
Report
System:
The UNT Digital Library
ELECTRICAL PROPERTIES OF ORGANIC SOLIDS. II: EFFECTS OF ADDEDELECTRON ACCEPTOR ON METAL-FREE PHTHALOCYANINE
The addition of ortho-chloranil to the surface of films of metal-free phthalocyanine has been found (a) to increase the dark conductivity of such films by as much as 10{sup 7}, (b) to increase the steady-state photoconductivity by as much as 10{sup 5}, and (c) to result in the formation of unpaired electrons whose concentration decreases reversibly as a result of illumination. These systems exhibit a light-induced polarization, the phthalocyanine layer becoming more positive with respect t o the ortho-chloranil layer. Kinetic studies demonstrate that, upon illumination, a single process (time constant = 40 seconds) results in the increase in conductivity, the decrease in unpaired spins, and the increase in polarization. The results are consistent with the following scheme. An electron transfer from phthalocyanine to ortho-chloranil occurs in the dark at room temperature, producing holes in the phthalocyanine layer and ortho-chloranil negative ion radicals (high conductivity, ESR signal). Illumination results in the transfer of an electron from an excited phthalocyanine molecule to the ortho-chloranil negative ion, producing further phthalocyanine holes and ortho-chloranil double-negative ion (increase in conductivity, increase in polarization, decrease in ESR signal). By equating spin concentration with charge - carrier concentration (phthalocyanine holes) it is possible to calculate a …
Date:
July 29, 1959
Creator:
Kearns, David R.; Tollin, Gordon & Calvin, Melvin
Object Type:
Report
System:
The UNT Digital Library
The Bellaire Texan (Bellaire, Tex.), Vol. 6, No. 20, Ed. 1 Wednesday, July 8, 1959
Weekly newspaper from Bellaire, Texas that includes local, state, and national news along with advertising.
Date:
July 8, 1959
Creator:
Norton, Mary
Object Type:
Newspaper
System:
The Portal to Texas History
The Bellaire Texan (Bellaire, Tex.), Vol. 6, No. 23, Ed. 1 Wednesday, July 29, 1959
Weekly newspaper from Bellaire, Texas that includes local, state, and national news along with advertising.
Date:
July 29, 1959
Creator:
Norton, Mary
Object Type:
Newspaper
System:
The Portal to Texas History
The Denison Press (Denison, Tex.), Vol. 32, No. 1, Ed. 1 Friday, July 10, 1959
Weekly newspaper from Denison, Texas that includes local, state and national news along with advertising.
Date:
July 10, 1959
Creator:
Anderson, LeRoy M.
Object Type:
Newspaper
System:
The Portal to Texas History
The Shamrock Texan (Shamrock, Tex.), Vol. 56, No. 15, Ed. 1 Thursday, July 23, 1959
Weekly newspaper from Shamrock, Texas that includes local, state, and national news along with advertising.
Date:
July 23, 1959
Creator:
Montgomery, Arval
Object Type:
Newspaper
System:
The Portal to Texas History
The Shamrock Texan (Shamrock, Tex.), Vol. 56, No. 12, Ed. 1 Thursday, July 2, 1959
Weekly newspaper from Shamrock, Texas that includes local, state, and national news along with advertising.
Date:
July 2, 1959
Creator:
Montgomery, Arval
Object Type:
Newspaper
System:
The Portal to Texas History
The Shamrock Texan (Shamrock, Tex.), Vol. 56, No. 16, Ed. 1 Thursday, July 30, 1959
Weekly newspaper from Shamrock, Texas that includes local, state, and national news along with advertising.
Date:
July 30, 1959
Creator:
Montgomery, Arval
Object Type:
Newspaper
System:
The Portal to Texas History
The Shamrock Texan (Shamrock, Tex.), Vol. 56, No. 13, Ed. 1 Thursday, July 9, 1959
Weekly newspaper from Shamrock, Texas that includes local, state, and national news along with advertising.
Date:
July 9, 1959
Creator:
Montgomery, Arval
Object Type:
Newspaper
System:
The Portal to Texas History
The Shamrock Texan (Shamrock, Tex.), Vol. 56, No. 14, Ed. 1 Thursday, July 16, 1959
Weekly newspaper from Shamrock, Texas that includes local, state, and national news along with advertising.
Date:
July 16, 1959
Creator:
Montgomery, Arval
Object Type:
Newspaper
System:
The Portal to Texas History
The Dublin Progress (Dublin, Tex.), Vol. 71ST YEAR, No. 17, Ed. 1 Friday, July 3, 1959
Weekly newspaper from Dublin, Texas that includes local, state, and national news along with advertising.
Date:
July 3, 1959
Creator:
Miller, Fred L.
Object Type:
Newspaper
System:
The Portal to Texas History
The Dublin Progress (Dublin, Tex.), Vol. 71ST YEAR, No. 18, Ed. 1 Friday, July 10, 1959
Weekly newspaper from Dublin, Texas that includes local, state, and national news along with advertising.
Date:
July 10, 1959
Creator:
Miller, Fred L.
Object Type:
Newspaper
System:
The Portal to Texas History
The Dublin Progress (Dublin, Tex.), Vol. 71ST YEAR, No. 21, Ed. 1 Friday, July 31, 1959
Weekly newspaper from Dublin, Texas that includes local, state, and national news along with advertising.
Date:
July 31, 1959
Creator:
Miller, Fred L.
Object Type:
Newspaper
System:
The Portal to Texas History
The Dublin Progress (Dublin, Tex.), Vol. 71ST YEAR, No. 20, Ed. 1 Friday, July 24, 1959
Weekly newspaper from Dublin, Texas that includes local, state, and national news along with advertising.
Date:
July 24, 1959
Creator:
Miller, Fred L.
Object Type:
Newspaper
System:
The Portal to Texas History
The Dublin Progress (Dublin, Tex.), Vol. 71ST YEAR, No. 19, Ed. 1 Friday, July 17, 1959
Weekly newspaper from Dublin, Texas that includes local, state, and national news along with advertising.
Date:
July 17, 1959
Creator:
Miller, Fred L.
Object Type:
Newspaper
System:
The Portal to Texas History
The Bellaire Texan (Bellaire, Tex.), Vol. 6, No. 22, Ed. 1 Wednesday, July 22, 1959
Weekly newspaper from Bellaire, Texas that includes local, state, and national news along with advertising.
Date:
July 22, 1959
Creator:
Norton, Mary
Object Type:
Newspaper
System:
The Portal to Texas History
The Denison Press (Denison, Tex.), Vol. 32, No. 4, Ed. 1 Friday, July 31, 1959
Weekly newspaper from Denison, Texas that includes local, state and national news along with advertising.
Date:
July 31, 1959
Creator:
Anderson, LeRoy M.
Object Type:
Newspaper
System:
The Portal to Texas History
The Denison Press (Denison, Tex.), Vol. 32, No. 2, Ed. 1 Friday, July 17, 1959
Weekly newspaper from Denison, Texas that includes local, state and national news along with advertising.
Date:
July 17, 1959
Creator:
Anderson, LeRoy M.
Object Type:
Newspaper
System:
The Portal to Texas History
The Denison Press (Denison, Tex.), Vol. 32, No. 3, Ed. 1 Friday, July 24, 1959
Weekly newspaper from Denison, Texas that includes local, state and national news along with advertising.
Date:
July 24, 1959
Creator:
Anderson, LeRoy M.
Object Type:
Newspaper
System:
The Portal to Texas History
The Denison Press (Denison, Tex.), Vol. 31, No. 52, Ed. 1 Friday, July 3, 1959
Weekly newspaper from Denison, Texas that includes local, state and national news along with advertising.
Date:
July 3, 1959
Creator:
Anderson, LeRoy M.
Object Type:
Newspaper
System:
The Portal to Texas History
The Bellaire Texan (Bellaire, Tex.), Vol. 6, No. 21, Ed. 1 Wednesday, July 15, 1959
Weekly newspaper from Bellaire, Texas that includes local, state, and national news along with advertising.
Date:
July 15, 1959
Creator:
Norton, Mary
Object Type:
Newspaper
System:
The Portal to Texas History
The Comanche Chief (Comanche, Tex.), Vol. 87, No. 3, Ed. 1 Friday, July 17, 1959
Weekly newspaper from Comanche, Texas that includes local, state, and national news along with advertising.
Date:
July 17, 1959
Creator:
Wilkerson, J. C.
Object Type:
Newspaper
System:
The Portal to Texas History
The Comanche Chief (Comanche, Tex.), Vol. 87, No. 2, Ed. 1 Friday, July 10, 1959
Weekly newspaper from Comanche, Texas that includes local, state, and national news along with advertising.
Date:
July 10, 1959
Creator:
Wilkerson, J. C.
Object Type:
Newspaper
System:
The Portal to Texas History
The Comanche Chief (Comanche, Tex.), Vol. 87, No. 5, Ed. 1 Friday, July 31, 1959
Weekly newspaper from Comanche, Texas that includes local, state, and national news along with advertising.
Date:
July 31, 1959
Creator:
Wilkerson, J. C.
Object Type:
Newspaper
System:
The Portal to Texas History