Activation energies and hole transport in photochemically modified molecularly doped polymers

James W. Stasiak; Teresa J. Storch

doi:10.1117/12.254243

15 October 1996 Activation energies and hole transport in photochemically modified molecularly doped polymers

James W. Stasiak, Teresa J. Storch

Proceedings Volume 2850, Organic Photorefractive Materials and Xerographic Photoreceptors; (1996) https://doi.org/10.1117/12.254243
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

The activation energy for charge transport in molecularly doped polymer films containing p-diethylaminobenzaldehyde diphenylhydrazone (DEH) is measured before and after systematic UV irradiation. UV exposure has been shown to induce a photochemical reaction of the DEH molecule which dramatically reduces the molecule's capability to transport charge. Presumably, the reduction in mobility is associated with the substantial increase (above 1 eV) in the ionization potential of the DEH molecule after photocyclization. The increase in ionization potential effectively removes the photochemically modified molecule from the primary transport manifold. In previous work, we have demonstrated that systematic UV irradiation of molecularly doped polymer films containing DEH provides a novel approach for diluting the dopant concentration and effectively increasing the intersite separation between 'active' dopant molecules in situ. Furthermore, ab initio calculations suggest that the dipole moment of the photoproduct is significantly lower than that of the unconverted DEH molecule. We exploit this photochemical process to prove the hopping activation energy, (Delta) , in DEH doped polycarbonate films parametric in UV irradiation time. The principal observation of this work is that despite a systematic and substantial elimination of active hopping sites and despite the systematic increase in the population of lower dipole moment neighbors, the hopping activation energy for the DEH/polycarbonate system remains constant.

Citation Download Citation

James W. Stasiak and Teresa J. Storch "Activation energies and hole transport in photochemically modified molecularly doped polymers", Proc. SPIE 2850, Organic Photorefractive Materials and Xerographic Photoreceptors, (15 October 1996); https://doi.org/10.1117/12.254243

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
9 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Molecules

Ultraviolet radiation

Polymers

Polarons

Molecular interactions

Ionization

Temperature metrology

Show All Keywords

Keywords/Phrases

Search In:

Publication Years