Article Dans Une Revue Beilstein Journal of Nanotechnology Année : 2018

A scanning probe microscopy study of nanostructured TiO 2 /poly(3-hexylthiophene) hybrid heterojunctions for photovoltaic applications

Résumé

The nanoscale morphology of photoactive hybrid heterojunctions plays a key role in the performances of hybrid solar cells. In this work, the heterojunctions consist of a nanocolumnar TiO 2 surface covalently grafted with a monolayer of poly(3-hexylthiophene) (P3HT) functionalized with carboxylic groups (-COOH). Through a joint analysis of the photovoltaic properties at the nanoscale by photoconductive-AFM (PC-AFM) and surface photovoltage imaging, we investigated the physical mechanisms taking place locally during the photovoltaic process and the correlation to the nanoscale morphology. A down-shift of the vacuum level of the TiO 2 surface upon grafting was measured by Kelvin probe force microscopy (KPFM), evidencing the formation of a dipole at the TiO 2 /P3HT-COOH interface. Upon in situ illumination, a positive photovoltage was observed as a result of the accumulation of photogenerated holes in the P3HT layer. A positive photocurrent was recorded in PC-AFM measurements, whose spatial mapping was interpreted consistently with the corresponding KPFM analysis, offering a correlated analysis of interest from both a theoretical and material design perspective. 2087

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hal-01977470 , version 1 (10-01-2019)

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Laurie Letertre, Roland Roche, Olivier Douhéret, Hailu Kassa, Denis Mariolle, et al.. A scanning probe microscopy study of nanostructured TiO 2 /poly(3-hexylthiophene) hybrid heterojunctions for photovoltaic applications. Beilstein Journal of Nanotechnology, 2018, 9, pp.2087-2096. ⟨10.3762/bjnano.9.197⟩. ⟨hal-01977470⟩
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