Organic Solar Materials Research Articles

Application of block copolymers in organic solar cells

After many years of development, block copolymers became one of the most important materials for organic solar cells. They were used in photovoltaic cells because of their self-assembly properties and controlled ordered nanoscale, which is ideal for electron-hole pair separation. However, block copolymers still faced several major challenges as organic solar materials, and this paper focused on their limitations and corresponding solutions in terms of material design, morphology control, and interface modification, as well as on the fundamental molecular engineering principles involved. In the paper’s conclusion, an perspective on the use of modern, advanced block copolymers in organic solar cells was provided.

Integrated Perovskite/Bulk-Heterojunction Organic Solar Cells.

The recently emerged integrated perovskite/bulk-heterojunction (BHJ) organic solar cells (IPOSCs) without any recombination layers have generated wide attention. This type of device structure can take the advantages of tandem cells using both perovskite solar and near-infrared (NIR) BHJ organic solar materials for wide-range sunlight absorption and the simple fabrication of single junction cells, as the low bandgap BHJ layer can provide additional light harvesting in the NIR region and the high open-circuit voltage can be maintained at the same time. This progress report highlights the recent developments in such IPOSCs and the possible challenges ahead. In addition, the recent development of perovskite solar cells and NIR organic solar cells is also covered to fully underline the importance and potential of IPOSCs.

Analysis of Organic Low-Carbon Solar Material

because of organic solar materials with light weight, low cost, flexible, which widespread concern by the people. According to main chain structure of polymer donator material classification, the article summarized the progress of research in this area in recent years and a detailed introduction by some attention from materials, design, performance analysis to device fabrication and performance, and provides valuable reference for future materials research and development.

The Role of Electron Affinity in Determining Whether Fullerenes Catalyze or Inhibit Photooxidation of Polymers for Solar Cells

AbstractUnderstanding the stability and degradation mechanisms of organic solar materials is critically important to achieving long device lifetimes. Here, an investigation of the photodegradation of polymer:fullerene blend films exposed to ambient conditions for a variety of polymer and fullerene derivative combinations is presented. Despite the wide range in polymer stabilities to photodegradation, the rate of irreversible polymer photobleaching in blend films is found to consistently and dramatically increase with decreasing electron affinity of the fullerene derivative. Furthermore, blends containing fullerenes with the smallest electron affinities photobleached at a faster rate than films of the pure polymer. These observations can be explained by a mechanism where both the polymer and fullerene donate photogenerated electrons to diatomic oxygen to form the superoxide radical anion which degrades the polymer.

Fine Pattern Transfer of Functional Organic Polymers by Nanoimprint

Nano structures on organic solar material are expected to improve power generation efficiency instead of bulk hetero junctions. In this study, we fabricated high aspect ratio nano structures using poly-3-hexylthiophene (P3HT) by a novel nano-imprint process. Fine structures 70-nm wide and 550-nm high were successful obtained. However, the pattern defects in the de-molding process were increased by basing on the increment of the pattern′s aspect ratio. We also investigated the relation between aspect ratio and defect yield.