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Charge transfer at organic‐organic heterojunctions is fundamental to several organic electronics devices, including light‐emitting diodes, photovoltaic cells, light‐emitting transistors, and ambipolar field‐effect transistors. Here, probe charge transfer (CT) processes during the formation of an organic‐organic heterojunction are probed by performing in situ real‐time electrical characterization during the growth of pentacene/C60 ambipolar transistors. N‐type C60 channel formation follows two different percolation pathways, one being associated to linear C60 structures growing along pentacene grain boundaries and the other to C60 island percolation. Upon n‐channel formation a shift of pentacene p‐type transfer characteristics is observed, which is attributed to CT across the heterojunction interface as a result of Fermi level alignment. The findings allow estimation of the energy of thermally accessible CT‐states and …
Publication date: 
1 Nov 2015

Adrica Kyndiah, Tobias Cramer, Cristiano Albonetti, Fabiola Liscio, Stefano Chiodini, Mauro Murgia, Fabio Biscarini

Biblio References: 
Volume: 1 Issue: 11 Pages: 1400036
Advanced Electronic Materials