• Energy Research

Ultrafast laser-annealing technique for the fabrication of large-grain perovskite films and efficient perovskite solar cells at room temperature.

A single-layer graphene film with high conductance and transparency was realized by effective chemical doping. The conductance of single-layer graphene was increased for more than 400% when it was doped with Au nanoparticles and poly(3,4-ethylenedioxythiophene): poly(styrene sulfonic acid). Then semitransparent organic solar cells based on poly(3-hexylthiophene) (P3HT) and phenyl-C61-butyric acid methyl ester (PCBM) were fabricated with single-layer graphene and indium tin oxide (ITO) as the top and bottom electrodes, respectively. The performance of the devices was optimized by tuning the active layer thickness and doping the single-layer graphene electrodes. The maximum efficiency of 2.7% was observed in the devices with the area of 20 mm(2) illuminated from graphene electrode under the AM1.5 solar simulator. It is notable that all of the devices showed higher efficiency from the graphene than ITO side, which was attributed to the better transmittance of the graphene electrodes. In addition, the influence of the active area of the organic solar cell on its photovoltaic performance was studied. We found that, when the active areas increased from 6 to 50 mm(2), the power conversion efficiencies decreased from 3% to 2.3% because of the increased series resistances and the decreased edge effect of the devices.

The efficiencies of organic solar cells are substantially improved by introducing suitable high mobility conjugated polymers as additives.

This work provides a comprehensive review on strategies like reducing agents, morphology control, compositional engineering and device engineering for fabricating efficient and stable tin-based perovskite solar cells.

We introduced Au@Ag core–shell nanocuboids with broadband plasmonic enhancement in organic photovoltaics, which show multimode localized surface plasmon resonance that can be tuned to match the light absorption spectra of the devices by changing the geometric size.

This review illustrates a summary from the PSM structure design to applications, including deposition processes, advanced material strategies, and encapsulation methods for long stability.

Recent progress of inorganic perovskite solar cells is reviewed along with different perovskite compositions.

AbstractHybrid organic/inorganic perovskite solar cells have been rapidly evolving with spectacular successes in both nanostructured and thin‐film versions. Herein, we report the use of a simple sol–gel‐processed NiO nanocrystal (NC) layer as the hole‐transport layer in an inverted perovskite solar cell. The thin NiO NC film with a faceted and corrugated surface enabled the formation of a continuous and compact layer of well‐crystallized CH3NH3PbI3 in a two‐step solution process. The hole‐extraction and ‐transport capabilities of this film interfaced with the CH3NH3PbI3 film were higher than those of organic PEDOT:PSS layers. The cell with a NiO NC film with a thickness of 30–40 nm exhibited the best performance, as a thinner layer led to a higher leakage current, whereas a thicker layer resulted in a higher series resistance. With the NiO film, we observed a cell efficiency of 9.11 %, which is by far the highest reported for planar perovskite solar cells based on an inorganic hole‐extracting layer.

Molecular passivation reduces the lattice defects and induces large grains for high efficiencies of perovskite solar cells.