title: Large-area soft-imprinted nanowire networks as light trapping transparent conductors.
abstract: Using soft-imprint nanolithography, we demonstrate large-area application of engineered two-dimensional polarization-independent networks of silver nanowires as transparent conducting electrodes. These networks have high optical transmittance, low electrical sheet resistance, and at the same time function as a photonic light-trapping structure enhancing optical absorption in the absorber layer of thin-film solar cells. We study the influence of nanowire width and pitch on the network transmittance and sheet resistance, and demonstrate improved performance compared to ITO. Next, we use P3HT-PCBM organic solar cells as a model system to show the realization of nanowire network based functional devices. Using angle-resolved external quantum efficiency measurements, we demonstrate engineered light trapping by coupling to guided modes in the thin absorber layer of the solar cell. Concurrent to the direct observation of controlled light trapping we observe a reduction in photocurrent as a result of increased reflection and parasitic absorption losses; such losses can be minimized by re-optimization of the NW network geometry. Together, these results demonstrate how engineered 2D NW networks can serve as multifunctional structures that unify the functions of a transparent conductor and a light trapping structure. These results are generic and can be applied to any type of optoelectronic device.
authors.affiliation: Center for Nanophotonics, FOM Institute AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands.
authors.forename: Jorik
authors.initials: J
authors.lastname: van de Groep
authors.affiliation: Departments of Applied Physics and Chemical Engineering &Chemistry, Eindhoven University of Technology, 5600 MB, Eindhoven, The Netherlands.
authors.forename: Dhritiman
authors.initials: D
authors.lastname: Gupta
authors.affiliation: Philips Research Laboratories, High-Tech Campus 4, 5656 AE Eindhoven, The Netherlands.
authors.forename: Marc A
authors.initials: MA
authors.lastname: Verschuuren
authors.affiliation: Departments of Applied Physics and Chemical Engineering &Chemistry, Eindhoven University of Technology, 5600 MB, Eindhoven, The Netherlands.
authors.forename: Martijn M
authors.initials: MM
authors.lastname: Wienk
authors.affiliation: Departments of Applied Physics and Chemical Engineering &Chemistry, Eindhoven University of Technology, 5600 MB, Eindhoven, The Netherlands.
authors.forename: Rene A J
authors.initials: RA
authors.lastname: Janssen
authors.affiliation: Center for Nanophotonics, FOM Institute AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands.
authors.forename: Albert
authors.initials: A
authors.lastname: Polman