Contents: (Small 18/2016)

Perovskite Solar CellsA moth-eye patterned mesoporous (mp) TiO 2 layer is fabricated in the form of submicron scale by using lithography, nano-imprinting and polydimethyl siloxane (PDMS) stamping methods.On page 2443, M. Choi, N.-G.Park, and co-workers demonstrate an excellent light harvesting property of perovskite solar cell by employing the motheye nanostructured mp-TiO 2 fi lm.These novel fabrication methods are expected to be optically benefi cial to opto-electronic devices. Ultralight MaterialsOn page 2432, a novel templating process for the creation of ultralow density metal oxide nanostructures is demonstrated by P. D. Bradford, and co-workers.The alumina structures are unique in that they are comprised of highly aligned and interconnected nanotubes yielding anisotropic behavior.Large-scale network structures with complex form-factors can easily be made using this technique.Application of the low density networks as humidity sensing materials as well as thermal insulation is demonstrated. Gold NanoparticlesComputational modeling is a virtual microscope providing molecular insight into the complex interactions occurring at nano-bio interfaces.The image shows the atomistic landscape of a peptide-adlayer on gold nanoparticles, providing the physicochemical information needed to tailor the design of effi cient colorimetric biosensors.The successes and challenges of theoretical simulations in facilitating gold nanomaterial design for biomedicine are reviewed on page 2395 by I. Yarovsky and co-workers.