Characterization of the ambipolar transport properties of polymer-based organic photoconductor by non-steady-state photo-EMF technique

A. Sanchez Juarez; K. Aleman; M. Espinosa; A. Kosarev; S. Mansurova; S. Koeber; K. Meerholz

doi:10.1117/12.873115

22 September 2010 Characterization of the ambipolar transport properties of polymer-based organic photoconductor by non-steady-state photo-EMF technique

A. Sanchez Juarez, K. Aleman, M. Espinosa, A. Kosarev, S. Mansurova, S. Koeber, K. Meerholz

Author Affiliations +

Proceedings Volume 7750, Photonics North 2010; 77501V (2010) https://doi.org/10.1117/12.873115
Event: Photonics North 2010, 2010, Niagara Falls, Canada

Abstract

Organic semiconductors with bipolar (electron and hole) transport capability play a crucial role in electronic and optoelectronic devices such as organic light-emitting diodes (OLEDs), bipolar transistors and photovoltaic cells. Recently, a considerable amount of work has been devoted to the characterization of ambipolar transport in organic materials, allowing for a better understanding of their properties as well as the physical processes, which take place in materials and devices [1-4]. The experimental methods used to obtain information about charge transport in organic semiconductors - time-of-flight (TOF) transient photoconductivity [5], charge extraction by linearly increasing voltage (CELIV) [6], current-voltage measurements in space charge limited current regime [7], and field effect transistor (FET) measurements [8, 9] are mostly focused on determination of charge carrier mobility. On the other hand, for many devices (e.g. organic photovoltaic solar cells or light emitting diodes) the knowledge of the transport and recombination characteristics of both carriers (electron and hole), and specifically their diffusion L_D = the square root of Dτ (here D is the diffusion coefficient and τ is the photocarriers lifetime) and drift lengths L₀ = μτE₀ (here μ is the carrier's mobility and E₀ is the electric dc field) is important.

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A. Sanchez Juarez, K. Aleman, M. Espinosa, A. Kosarev, S. Mansurova, S. Koeber, and K. Meerholz "Characterization of the ambipolar transport properties of polymer-based organic photoconductor by non-steady-state photo-EMF technique", Proc. SPIE 7750, Photonics North 2010, 77501V (22 September 2010); https://doi.org/10.1117/12.873115

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KEYWORDS

Photoresistors

Diffusion

Modulation

Polymers

Electron transport

Organic semiconductors

Solar cells

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