Improving the performance of photovoltaic cells based on nanocomposites with contorted polycyclic aromatic hydrocarbon additive in bulk heterojunction
| Autor: | Chel-Jong Choi, Jaeho Shim, Sang-Youp Yim, Yeonghoon Jin, Seokhoon Ahn, Joo Song Lee, Young Jae Park, Jaehyeon Lee, Dong Ick Son, Kyoungsik Yu |
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| Rok vydání: | 2021 |
| Předmět: |
chemistry.chemical_classification
Materials science Nanocomposite Photovoltaic system Polycyclic aromatic hydrocarbon chemistry.chemical_element General Chemistry Cocrystal Polymer solar cell Effective nuclear charge chemistry.chemical_compound Hexabenzocoronene chemistry Chemical engineering Materials Chemistry Carbon |
| Zdroj: | Journal of Materials Chemistry C. 9:13081-13089 |
| ISSN: | 2050-7534 2050-7526 |
| Popis: | Recently, research on the use of additives in photoactive layers to improve the efficiency of solar cells has continued to be conducted. Among them, carbon-based additives serve to increase a device's efficiency by simply and effectively improving the carrier movement. In this work, inverted polymer solar cells (iPSCs) are fabricated based on a blend of PTB7-Th:PC71BM and PTB7:PC71BM bulk heterojunction as photoactive materials using mixed additives of 4Cl-carbon-based contorted hexabenzocoronene (4Cl-cHBC). The 4Cl-cHBC additives, a kind of contorted polycyclic aromatic hydrocarbon, added to bulk heterojunction in the iPSC devices, provide a cocrystal modifier and effective charge separation to enhance device performance. The reason for this efficiency improvement is that cocrystal is formed due to a combination between 4Cl-cHBC and the PTB7-Th:PC71BM bulk heterojunction, which reduces bimolecular recombination in the device and significantly increases short-circuit current and fill factor. The RS and RSh values of iPSCs based on PTB7-Th:PC71BM with and without the 4Cl-cHBC additives decreased from 7.0 Ω cm2 to 4.0 Ω cm2, and increased from 813 Ω cm2 to 1226 Ω cm2, respectively. The calculated average carrier lifetimes at 500 nm for PTB7-Th:PC71BM and PTB7-Th:PC71BM with 4Cl-cHBC additives are 4.46 ps and 3.06 ps, respectively. The carrier lifetimes show that the charge separation of PTB7-Th:PC71BM with 4Cl-cHBC additives is more than 45% faster. As a result, the iPSCs based on the blend of PTB7-Th:PC71BM and PTB7:PC71BM with 4Cl-cHBC additives showed maximum power conversion efficiencies of 9.46 and 8.62%, which were 20.6 and 19.95% higher than those of the reference, respectively. |
| Databáze: | OpenAIRE |
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