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New indolo carbazole-based non-fullerene n-type semiconductors for organic solar cell applications
- Source :
- Journal of Materials Chemistry C. 7:543-552
- Publication Year :
- 2019
- Publisher :
- Royal Society of Chemistry (RSC), 2019.
-
Abstract
- In this work, two new indolo-[3,2-b]-carbazole (ICz) core-based non-fullerene acceptors (ICz-Rd2 and ICz-RdCN2) with an A–π–D–π–A backbone were designed, synthesized, and characterized and the influence of molecular engineering on the terminal end groups on their performance in organic solar cells (OSCs) was systematically examined. The ICz-Rd2 and ICz-RdCN2 acceptors showed strong and wide-ranging absorption profiles from 350–800 nm in solution and film with high molar extinction coefficients of 6.6 × 104 M−1 cm−1 and 1.0 × 105 M−1 cm−1, respectively. These acceptors were employed along with a low band gap D–A conjugated polymer P as a donor for polymer solar cells and, after optimization of the active layers, the P:ICz-Rd2- and P:ICz-RdCN2-based devices offered overall power conversion efficiencies of 7.88% and 9.76%, which are higher than that of their PC71BM-processed counterpart (5.89%). The enhanced power conversion efficiencies for these non-fullerene acceptors may be related to the wide absorption spectra of the active layers and their low voltage loss.
- Subjects :
- Fullerene
Materials science
Organic solar cell
Absorption spectroscopy
Band gap
Carbazole
Analytical chemistry
02 engineering and technology
General Chemistry
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Polymer solar cell
0104 chemical sciences
Molecular engineering
chemistry.chemical_compound
chemistry
Materials Chemistry
0210 nano-technology
Absorption (electromagnetic radiation)
Subjects
Details
- ISSN :
- 20507534 and 20507526
- Volume :
- 7
- Database :
- OpenAIRE
- Journal :
- Journal of Materials Chemistry C
- Accession number :
- edsair.doi...........8ffc23e0102dc9f1d84b0861ee72395b