Abstract
The Lateral photovoltaic effect (LPE) has been used as an effective tool to probe the dynamics of photogenerated charge carriers in conjugated polymer based optoelectronic devices. In this paper, we analyze the time-dependence of LPE in a position sensing device geometry using a discrete circuit equivalent model coupled with a spreading impedance approach. We elucidate the dependence of the lateral photovoltage (LPV) on the position, intensity and the modulation frequency (ω c ) of the light beam. Previous experimental results for the position and ω c dependence of the LPV in the steady state are successfully reproduced within the present approach. We predict a clear knee-like feature in the transient regime of the LPV for high photocurrent values. This feature prompts us to propose that the response time of the organic position sensing device decreases sharply with increasing incident intensity.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Burroughes J. et al.: The first polymer LEDs. Light-emitting-diodes based on conjugated polymers. Nature 347, 539–541 (1990)
Campbell J., Bradley D.D.C., Antoniadis H.: Dispersive electron transport in an electroluminescent polyfluorene. Appl. Phys. Lett. 79, 2133–2135 (2001)
Choulis A. et al.: High ambipolar and balanced carrier mobility in regioregular poly(3-hexylthiophene). Appl. Phys. Lett. 85, 3890–3892 (2004)
Forrest S.R.: The path to ubiquitous and low-cost organic electronic appliances on plastic. Nature 428, 911–918 (2004)
Fynn A., Bajaj J., Farone L.: A discrete element model of laser . . . HgCdTe photodiodes. IEEE Trans. Elect. Dev. 42, 1775–1782 (1995)
Kabra D., Singh T.B., Narayan K.S.: Semiconducting-polymer-based position-sensitive detectors. Appl. Phys. Lett. 85(21), 5073–5075 (2004)
Kabra D., Shriram S., Vidhyadhiraja N.S., Narayan K.S.: Charge carrier dynamics in organic semiconductors by position dependent optical probing. J. Appl. Phys. 101, 064510 (2007)
Kabra D., Verma J., Vidhyadhiraja N.S., Narayan K.S.: Model for studies of lateral photovoltaic effect in polymeric semiconductors. IEEE Sensors. Journal. 8, 1663–1671 (2008)
Malliaras G., Friend R.H.: An organic electronics primer. Phys. Today 58, 53–58 (2005)
Valasaki L., Moreira M., Micaroni L., Hummelgen I.A.: Charge injection and transport in electrochemical films of poly(3-hexylthiophene). J. Appl. Phys. 92, 2035 (2002)
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Tiwari, A.K., Vidhyadhiraja, N.S. Transient and steady state lateral charge transport in polymeric semiconductors. Opt Quant Electron 41, 787–793 (2009). https://doi.org/10.1007/s11082-010-9392-0
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11082-010-9392-0