Analysis of bulk heterojunction material parameters using lateral device structures

作者：Danielson Eric; Ooi Zi En; Liang Kelly; Morris Joshua; Lombardo Christopher; Dodabalapur Ananth^*

来源：Journal of Photonics for Energy, 2014, 4(1): 040994.

DOI：10.1117/1.JPE.4.040994

• photovoltaic systems
• organic materials
• carrier dynamics

We review the key optoelectronic properties of lateral organic bulk heterojunction (BHJ) device structures with asymmetric contacts. These structures are used to develop a detailed model of charge transport and recombination properties within materials used for organic photovoltaics. They permit a variety of direct measurement techniques, such as nonlinear optical microscopy and in situ potentiometry, as well as photoconductive gain and carrier drift length studies from photocurrent measurements. We present a theoretical framework that describes the charge transport physics within these devices. The experimental results presented are in agreement with this framework and can be used to measure carrier concentrations, recombination coefficients, and carrier mobilities within BHJ materials. Lateral device structures offer a useful complement to measurements on vertical photovoltaic structures and provide a more complete and detailed picture of organic BHJ materials. (C) The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

• 出版日期2014-7-25