No abstract

Dye-sensitized solar cells (DSCs) are celebrating their 30th birthday and they are attracting a wealth of research efforts aimed at unleashing their full potential. Righteous font designed by Astigmatic and licensed under the Open Font License.

Indoor light harvesters enable machine learning on fully autonomous IoT devices at 2.72 × 1015 photons per inference.

Large datasets are now ubiquitous as technology enables higher-throughput experiments, but rarely can a research field truly benefit from the research data generated due to inconsistent formatting, undocumented storage or improper dissemination. Here we extract all the meaningful device data from peer-reviewed papers on metal-halide perovskite solar cells published so far and make them available in a database. We collect data from over 42,400 photovoltaic devices with up to 100 parameters per device. We then develop open-source and accessible procedures to analyse the data, providing examples of insights that can be gleaned from the analysis of a large dataset. The database, graphics and analysis tools are made available to the community and will continue to evolve as an open-source initiative. This approach of extensively capturing the progress of an entire field, including sorting, interactive exploration and graphical representation of the data, will be applicable to many fields in materials science, engineering and biosciences.

Perovskite-based solar cells are generally assembled as planar structures comprising a fl at organoammonium metal halide perovskite layer, or mesoscopic structures employing a mesoporous metal-oxide scaffold into which the perovskite material is infi ltrated. To present, little attention has been directed toward the texturing of the perovskite material itself. Herein, a textured CH 3 NH 3 PbI 3 morphology formed through a thin mesoporous TiO 2 seeding layer and a gas-assisted crystallization method is reported. The textured morphology comprises a multitiered nanostructure, which allows for signifi cant improvements in the light harvesting and charge extraction performance of the solar cells. Due to these improvements, average shortcircuit current densities for a batch of 28 devices are in excess of 22 mA cm −2 , and the maximum recorded power conversion effi ciency is 16.3%. The performance gains concomitant with this textured CH 3 NH 3 PbI 3 morphology provide further insights into how control of the perovskite microstructure can be used to enhance the cell performance.

Solid-state dye-sensitized solar cell components, materials, architectures and interfaces are comprehensively reviewed.

In dye-sensitized solar cells (DSCs), the redox mediator is responsible for the regeneration of the oxidized dye and for the hole transport towards the cathode. Here, we introduce new copper complexes with tetradentate 6,6-bis(4-(S)-isopropyl-2-oxazolinyl)-2,2-bipyridine ligands, Cu(oxabpy), as redox mediators. Copper coordination complexes with a square-planar geometry show low reorganization energies and thus introduce smaller losses in photovoltage. Slow recombination kinetics of excited electrons between the TiO 2 and Cu II (oxabpy) species lead to an exceptionally long electron lifetime, a high Fermi level in the TiO 2 , and a high photovoltage of 920 mV with photocurrents of 10 mA•cm −2 and 6.2% power conversion efficiency. Meanwhile, a large driving force remains for the dye regeneration of the Y123 dye with high efficiencies. The square-planar Cu(oxabpy) complexes yield viscous gel-like solutions. The unique charge transport characteristics are attributed to a superposition of diffusion and electronic conduction. An enhancement in charge transport performance of 70% despite the higher viscosity is observed upon comparison of Cu(oxabpy) to the previously reported Cu(tmby) 2 redox electrolyte.

The impending implementation of billions of Internet of Things and wireless sensor network devices has the potential to be the next digital revolution, if energy consumption and sustainability constraints can...