Nanostructured interfaces in polymer solar cells

Wiedemann, W; Sims, L.; Abdellah, Alaa; Exner, A.; Meier, Robert J.; Musselman, Kevin P.; MacManus‐Driscoll, Judith L.; Müller‐Buschbaum, Peter; Scarpa, Giuseppe; Lugli, Paolo; Schmidt‐Mende, Lukas

doi:10.1063/1.3458809

Cited by 70 publications

(55 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In order to guarantee a strict bi-layered interface of the acceptor with the donor polymer PCPDTBT (Konarka Technologies) a lamination technique was used as described elsewhere. [ 58,59 ] In brief, thin fi lms of PCPDTBT were spun on freshly cleaved mica from chlorobenzene, fl oated on deionized water and transferred onto the substrates. Before application of Ag top contacts by sputter deposition a thin layers of PEDOT:PSS (Baytron P Al 4083) is applied from 1:10 solution in isopropanol as described elsewhere [ 60 ] and dried in air to guarantee ohmic contacts.…”

Section: Methodsmentioning

confidence: 99%

Perylene Sensitization of Fullerenes for Improved Performance in Organic Photovoltaics

Hesse

Weickert

Hundschell

et al. 2011

Advanced Energy Materials

View full text Add to dashboard Cite

We present the addition of an energy relay dye to fullerenes resulting in increased light harvesting and significantly improved power conversion efficiency for organic photovoltaic (OPV) devices. Although exhibiting excellent properties as electron acceptors, visible light absorption of fullerenes is limited. Strongly light absorbing donor materials are needed for efficient light harvesting in the thin active layer of OPV devices. Therefore, photocurrent generation and thus power conversion efficiency of this type of solar cell is confined by the overlap of the relatively narrow absorption band of commonly used donor molecules with the solar spectrum. Herein the concept of fullerene dye sensitization is presented, which allows increased light harvesting on the electron acceptor side of the heterojunction. The concept is exemplarily shown for an UV absorbing small molecule and a near infrared absorbing polymer, namely hexa‐peri‐hexabenzocoronene (HBC) and Poly[2,1,3‐benzothiadiazole‐4,7‐diyl[4,4‐bis(2‐ethylhexyl)‐4H‐cyclopenta[2,1‐b:3,4‐b']dithiophene‐2,6‐diyl]] (PCPDTBT), respectively. In both systems remarkably higher power conversion efficiency is achieved via perylene sensitization of the fullerene acceptor. Steady state photoluminescence, transient absorption and transient photocurrent decay studies reveal pathways of the additionally generated excited states at the sensitizer molecule. The findings suggest fluorescence resonance energy transfer from the photo‐excited dye to the fullerene enabling decoupling of light absorption and charge transport. The presented sensitization method is proposed as a viable new concept for performance enhancement in organic photovoltaic devices.

show abstract

Section: Methodsmentioning

confidence: 99%

Perylene Sensitization of Fullerenes for Improved Performance in Organic Photovoltaics

Hesse

Weickert

Hundschell

et al. 2011

Advanced Energy Materials

View full text Add to dashboard Cite

show abstract

“…Both FF and V OC increased slightly in the nanostructured cell. [ 49 ] A study based on P3HT and a small molecule acceptor was published by Zeng and co-workers. [ 50 ] Very similar to the previous investigations, Zeng et al produced a nanostructured array of P3HT by NIL with a silicon mold.…”

Section: Nanoimprint Lithographymentioning

confidence: 99%

Nanostructured Organic and Hybrid Solar Cells

et al. 2011

View full text Add to dashboard Cite

This Progress Report highlights recent developments in nanostructured organic and hybrid solar cells. The authors discuss novel approaches to control the film morphology in fully organic solar cells and the design of nanostructured hybrid solar cells. The motivation and recent results concerning fabrication and effects on device physics are emphasized. The aim of this review is not to give a summary of all recent results in organic and hybrid solar cells, but rather to focus on the fabrication, device physics, and light trapping properties of nanostructured organic and hybrid devices.

show abstract

“…Schmidt-Mende et al used the AAO membranes to pattern the surface of a P3HT layer and then spin-coated a PCBM layer on top of this using orthogonal solvent, that is, a solvent that dissolved the PCBM but not the P3HT. 153 The roughness of the interface increased the interfacial area between the donor and the acceptor, which led to increased device efficiency. Carter et al used a PDMS stamp and solvent-assisted soft stamp-based NIL (SASSNIL) to prepare P3HT/PCBM bilayer solar cells and showed a device efficiency almost twice that of the planar bilayer devices.…”

Section: Nanofabricated Solar Cellsmentioning

confidence: 99%

On the morphology of polymer‐based photovoltaics

Liu

Jung

et al. 2012

J Polym Sci B Polym Phys

309

248

View full text Add to dashboard Cite

We review the morphologies of polymer-based solar cells and the parameters that govern the evolution of the morphologies and describe different approaches to achieve the optimum morphology for a BHJ OPV. While there are some distinct differences, there are also some commonalities. It is evident that morphology and the control of the morphology are important for device performance and, by controlling the thermodynamics, in particular, the interactions of the components, and by controlling kinetic parameters, like the rate of solvent evaporation, crystallization and phase separation, optimized morphologies for a given system can be achieved. While much research has focused on P3HT, it is evident that a clearer understanding of the morphology and the evolution of the morphology in low bad gap polymer systems will increase the efficiency further. While current OPVs are on the verge of breaking the 10% barrier, manipulating and controlling the morphology will still be key for device optimization and, equally important, for the fabrication of these devices in an industrial setting.

show abstract

Nanostructured interfaces in polymer solar cells

Cited by 70 publications

References 21 publications

Perylene Sensitization of Fullerenes for Improved Performance in Organic Photovoltaics

Perylene Sensitization of Fullerenes for Improved Performance in Organic Photovoltaics

Nanostructured Organic and Hybrid Solar Cells

On the morphology of polymer‐based photovoltaics

Contact Info

Product

Resources

About