Pyrene-benzo[1,2,5]thiadiazole based conjugated polymers for application in BHJ solar cells
| Autor: | David G. Lidzey, Ahmed Iraqi, Yiwei Zhang, Bakhet A. Alqurashy |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
Materials science 010405 organic chemistry Band gap Pyrene General Chemistry Polymer Benzothiadiazole Conjugated system Conjugated polymers 010402 general chemistry 01 natural sciences Acceptor Polymer solar cell 0104 chemical sciences lcsh:Chemistry chemistry.chemical_compound chemistry Polymerization lcsh:QD1-999 Polymer chemistry Thiophene Photovoltaic BHJ |
| Zdroj: | Journal of Saudi Chemical Society, Vol 24, Iss 6, Pp 484-491 (2020) |
| ISSN: | 1319-6103 |
| Popis: | Ethylhexyloxy-functionalised pyrene (PEH) was prepared and copolymerised with both dithienyl-benzo[c]-[1], [2], [5]thiadiazole and dibithiophenyl-benzo[c]-[1], [2], [5]thiadiazole via a Stille coupling polymerisation method to yield PPEH-DTBT-8 and PPEH-DT2BT-8, respectively. A comparative study was conducted to assess the impact of substituting thiophene for bithiophene repeat units upon the resulting properties of the conjugated polymers. PPEH-DT2BT-8 which has bithiophene spacers between pyrene and benzothiadiazole repeat units, exhibited a narrower optical and electrochemical band gap relative to PPEH-DTBT-8; a consequence of the incorporating bithiophene spacer units which promote intramolecular charge transfer between the electron donating and electron accepting moieties. Both PPEH-DTBT-8 and PPEH-DT2BT-8 showed deep HOMO levels of -5.54 and -5.50 eV, respectively. The polymers possess good thermal stabilities with degradation temperatures in excess of 310 °C. The photovoltaic performance of the two polymers was studied by fabricating bulk heterojunction (BHJ) photovoltaic devices using PC70BM as the acceptor. PPEH-DTBT-8 and PPEH-DT2BT-8 demonstrated efficiencies of 0.33 and 1.83%, respectively. The higher efficiency of PPEH-DT2BT-8 can be attributed to vastly improved FF and Jsc values. |
| Databáze: | OpenAIRE |
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