Donor-Acceptor Shape Matching Drives Performance in Photovoltaics
| Autor: | T. Schiros [1], G. Kladnik [2, D. Prezzi [4], A. Ferretti [4], G. Olivieri [3, A. Cossaro [3], L. Floreano [3], A. Verdini [3], C. Schenck [6], M. Cox [7], A. A. Gorodetsky [6], K. Plunkett [6], D. Delongchamp [8], C. Nuckolls [6], A. Morgante [3, D. Cvetko [2, I. Kymissis [7] |
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| Přispěvatelé: | Theanne, Schiro, Kladnik, Gregor, Deborah, Prezzi, Andrea, Ferretti, Giorgia, Olivieri, Cossaro, Albano, Luca, Floreano, Alberto, Verdini, Christine, Schenck, Marshall, Cox, Gorodetsky, Alon A., Kyle, Plunkett, Dean, Delongchamp, Colin, Nuckoll, Morgante, Alberto, Dean, Cvetko, Ioannis, Kymissis |
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Organic electronics
Materials science Organic solar cell Renewable Energy Sustainability and the Environment business.industry fullerene supramolecular material fullerenes Heterojunction organic electronics supramolecular materials solar cells Self-assembly Acceptor Supramolecular assembly solar cell Electron transfer Photovoltaics organic electronic Optoelectronics General Materials Science Density functional theory business |
| Zdroj: | Advanced energy materials (Internet) 3 (2013). doi:10.1002/aenm.201201125 info:cnr-pdr/source/autori:T. Schiros [1], G. Kladnik [2,3], D. Prezzi [4], A. Ferretti [4], G. Olivieri [3,5], A. Cossaro [3], L. Floreano [3], A. Verdini [3], C. Schenck [6], M. Cox [7], A. A. Gorodetsky [6], K. Plunkett [6], D. Delongchamp [8], C. Nuckolls [6], A. Morgante [3,5], D. Cvetko [2,3], I. Kymissis [7]/titolo:Donor-Acceptor Shape Matching Drives Performance in Photovoltaics/doi:10.1002%2Faenm.201201125/rivista:Advanced energy materials (Internet)/anno:2013/pagina_da:/pagina_a:/intervallo_pagine:/volume:3 |
| DOI: | 10.1002/aenm.201201125 |
| Popis: | While the demonstrated power conversion eff i ciency of organic photovoltaics (OPVs) now exceeds 10%, new design rules are required to tailor interfaces at the molecular level for optimal exciton dissociation and charge transport in higher effi ciency devices. We show that molecular shape-complementarity between donors and acceptors can drive performance in OPV devices. Using core hole clock (CHC) X-ray spectroscopy and density functional theory (DFT), we compare the electronic coupling, assembly, and charge transfer rates at the interface between C 60 acceptors and fl at- or contorted-hexabenzocorone (HBC) donors. The HBC donors have similar optoelectronic properties but differ in molecular contortion and shape matching to the fullerene acceptors. We show that shape-complementarity drives self-assembly of an intermixed morphology with a donor/acceptor (D/A) ball-and-socket interface, which enables faster electron transfer from HBC to C 60 . The supramolecular assembly and faster electron transfer rates in the shape complementary heterojunction lead to a larger active volume and enhanced exciton dissociation rate. This work provides fundamental mechanistic insights on the improved effi ciency of organic photovoltaic devices that incorporate these concave/convex D/A materials. |
| Databáze: | OpenAIRE |
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