Galli, Diana published the artcileSuppressing the Surface Recombination and Tuning the Open-Circuit Voltage of Polymer/Fullerene Solar Cells by Implementing an Aggregative Ternary Compound, Safety of 2,5-Dibromo-3,4-dinitrothiophene, the publication is ACS Applied Materials & Interfaces (2018), 10(34), 28803-28811, database is CAplus and MEDLINE.
The authors present a novel small mol. based on dithienylthienothiadiazole units (named SM1) acting as an efficient component in ternary blend organic solar cells to modify the hole extraction at the interface. The SM1 suppresses the surface recombination and enhances the open-circuit voltage (Voc). By introducing SM1 in a host system composed of poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C61-butyric acid Me ester (PCBM), the authors obtained Voc values of up to 0.75 V and fill factors larger than 70% for the ternary blends. As a consequence, the power conversion efficiency is improved by ∼30% compared to P3HT:PCBM binary devices. External quantum efficiency and absorption spectra in the near-IR region do not show any contribution of SM1 in dried films. Instead, the addition of the small mol. improves the Voc by reducing the surface recombination losses. To shed light on the recombination processes, the authors carried out Fourier-transform photocurrent spectroscopy and impedance spectroscopy measurements. The ternary concept can also have functionalities other than photosensitization and can even act as a morphol.-directing agent or an interface modifier.
ACS Applied Materials & Interfaces published new progress about 52431-30-8. 52431-30-8 belongs to bromides-buliding-blocks, auxiliary class Liquid Crystal &OLED Materials, name is 2,5-Dibromo-3,4-dinitrothiophene, and the molecular formula is C4Br2N2O4S, Safety of 2,5-Dibromo-3,4-dinitrothiophene.
Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary