Dresden 2017 – scientific programme
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DS: Fachverband Dünne Schichten
DS 44: Postersession II
DS 44.49: Poster
Thursday, March 23, 2017, 17:00–19:00, P1C
Improving the photovoltaic performance of hybrid photovoltaics by inorganic interfacial modification — •Yvonne J. Hofstetter1,2, Paul E. Hopkinson1,2, Artem A. Bakulin3, and Yana Vaynzof1,2 — 1Kirchhoff-Institut für Physik, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany — 2Centre for Advanced Materials, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 225, 69120 Heidelberg, Germany — 3Cavendish Laboratory, Cambridge University, JJ Thomson Ave, Cambridge, UK
Bilayer organic-inorganic hybrid photovoltaic devices offer the possibility to modify the organic-inorganic interface, and thus to influence the efficiency of photo-induced charge separation. Various organic modifiers have been investigated, whereas inorganic modifiers have remained unconsidered for the most part. Here, we introduce an inorganic modifier, caesium carbonate, as an interlayer in a model poly(3-hexathiophene)/ZnO system. Upon modification, we observe an improved energy level alignment at the hybrid interface resulting in a significantly increased open circuit voltage, and suppressed formation of interfacial bound charge pairs resulting in reduced interfacial recombination losses and an increased short circuit current. These improvements add up to a twelve fold enhancement in power conversion efficiency which demonstrates the significant potential of applying inorganic modifiers in hybrid photovoltaics to improve the performance.