Exciton annihilation and diffusion in semiconducting polymers

P. E. Shaw; A. J. Lewis; A. Ruseckas; I. D. W. Samuel

doi:10.1117/12.681573

15 November 2006 Exciton annihilation and diffusion in semiconducting polymers

P. E. Shaw, A. J. Lewis, A. Ruseckas, I. D. W. Samuel

Proceedings Volume 6334, Organic Photovoltaics VII; 63340G (2006) https://doi.org/10.1117/12.681573
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

Abstract

We show that time-resolved luminescence measurements at high excitation densities can be used to study exciton annihilation and diffusion, and report the results of such measurements on films of P3HT and MEH-PPV. The results fit to an exciton-exciton annihilation model with a time independent annihilation rate γ, which was measured to be γ = (2.8±0.5)×10^-8 cm³s^-1 in MEH-PPV and γ = (5.2±1)×10^-10 cm³s^-1 in P3HT. This implies much faster diffusion in MEHPPV. Assuming a value of 1 nm for the annihilation radius we evaluated the diffusion length for pristine P3HT in one direction to be 3.2 nm. Annealing of P3HT was found to increase the annihilation rate to (1.1±0.2)×10^-9 cm³s^-1 and the diffusion length to 4.7 nm.

Citation Download Citation

P. E. Shaw, A. J. Lewis, A. Ruseckas, and I. D. W. Samuel "Exciton annihilation and diffusion in semiconducting polymers", Proc. SPIE 6334, Organic Photovoltaics VII, 63340G (15 November 2006); https://doi.org/10.1117/12.681573

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