Ziqi Liang, Alexandre M. Nardes, Jao van de Lagemaat and Brian A. Gregg Activation Energy Spectra: Insights into Transport Limitations of Organic Semiconductors and Photovoltaic Cells Advanced Functional Materials 22
Dark current and photocurrent activation energy spectra are measured for two types of poly(3-hexylthiophene) in pure films, films blended with [6,6]-phenyl-C61-butyric acid methyl ester (PCBM), and in bulk heterojunction organic photovoltaic cells. The cells show an unexpected transport limitation near the open circuit photovoltage. The results support a model of transport that combines the influence of short-range energetic disorder with long-range Coulomb fields from charged defects.
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