Toward Efficient All-Polymer Solar Cells via Halogenation on Polymer Acceptors
| Autor: | Shuguang Wen, Han Young Woo, Jianyu Yuan, Zhiyan Jia, Qilin Zhang, Jianye Yang, Hongmei Qin, Renqiang Yang, Wanli Ma, Yuxiang Li, Ziang Wu |
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| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
Electron mobility Materials science Halogenation 02 engineering and technology Polymer 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Polymer solar cell 0104 chemical sciences Organic semiconductor Chemical engineering chemistry General Materials Science 0210 nano-technology |
| Zdroj: | ACS Applied Materials & Interfaces. 12:33028-33038 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.0c08442 |
| Popis: | Although halogenation has been widely regarded as an effective approach to adjust the properties of organic semiconductors, systematic investigation on the comparison of nonhalogenated and halogenated polymer acceptors only received minor attention in all-polymer solar cell (all-PSC) community. Herein, we report three IDIC-based narrow band gap polymer acceptors, PIDIC2T, PIDIC2T2F, and PIDIC2T2Cl, which are composed of IDIC-C16 building blocks as acceptor units, linking pristine bithiophene, fluorinated bithiophene, or chlorinated bithiophene as donor units. Although these three polymer acceptors exhibit nearly identical lowest unoccupied molecular orbital (LUMO) levels of ca. -3.87 eV with a similar optical band gap of ca. 1.54 eV, we found that different halogen species significantly affect the electron mobility and thin-film morphology of the polymer acceptors. All-PSCs were fabricated by pairing three polymer acceptors with a PBDB-T polymer donor, while PIDIC2T2Cl delivered a highest power conversion efficiency (PCE) of 5.34% due to its favorable bulk morphology with smaller root-mean-square (rms) roughness values, which induce the relatively more balanced charge carrier mobilities. By blending the fluorinated analogue of PBDB-T, PM6, further improved |
| Databáze: | OpenAIRE |
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