Thin film thermal conductivity measurement on semi-conducting polymer materials using the 3-omega technique

S. Rausch1, D. Rauh1, S. Vidi1 and H. Ebert1

1Bavarian Centre for Applied Energy Research (ZAE Bayern), Germany

Keywords: thin film
property: thermal conductivity
material: poly(3-hexylthiophene)

Organic solar cells gained increasing interest in recent years due to their promising low-cost processing possibility and high throughput compared to inorganic solar cells [1]. Since efficiency of organic solar cells is still low, further optimization has to be done. Reliable simulations of solar cell layout and performance strongly depend on correct input data of electrical and thermal transport properties of the applied film materials. In most cases these material properties are only available for bulk material. Due to the given film thicknesses and to the preparation methods the properties of the used system can differ from the bulk material values. For the determination of thin film thermal conductivity only few measurement methods are known to produce accurate results one of them being the 3-omega technique [2]. It allows the determination of the thermal conductivity of bulk materials as well as thin films down to a thickness of around 50nm. This work is part of an investigation on the influence of local hot spots, generated by defects in the active layer of organic solar cells, on the charge carrier mobility as well as the propagation of the hot spot due to the thermal conduction of the material. Applying the 3-omega technique the thermal conductivity of solution derived poly(3-hexylthiophene) thin films of different thickness on common glass substrate was investigated.

  1. C. Brabec, U.Scherf, V.Dyakonov, Organic Photovoltaics, (Wiley VCH,Weinheim,2008)

  2. R. Frank, V. Drach, J. Fricke, Rev. Sci. Instrum. 64, 3 (1993)

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