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Optimization of hybrid P3HT:CdSe photovoltaic devices through surface ligand modification
Materials Science in Semiconductor Processing ( IF 4.1 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.mssp.2020.104934 M. Elain Hajlaoui , N. Hnainia , Z. Gouid , A. Benchaabane , M.A. Sanhoury , R. Chtourou
Materials Science in Semiconductor Processing ( IF 4.1 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.mssp.2020.104934 M. Elain Hajlaoui , N. Hnainia , Z. Gouid , A. Benchaabane , M.A. Sanhoury , R. Chtourou
Abstract Within the last few years, renewable energy devices have been gaining growing interest and the quest for environmentally friendly efficient photovoltaic cells continues. Amongst commonly used designs, bulk heterojunctions consist of blending a conjugated polymer donor with semiconducting nanocrystals (NCs) as acceptors. These nanocrystals are promising substitutes for fullerene normally used as acceptor, offering better electron mobility, tunable band gap and higher dielectric constant to prevent recombination of charge carrier into excitons. In this work, cadmium selenide nanocrystals (CdSe) capped with different phosphine oxides (R3PO: R = Me2N, Et2N, pyrrolidinyl (Pyrr), piperidinyl (Pip) or octyl groups) were synthesized and characterized using powder XRD and Transmission Electron Microscopy (TEM) Then, we investigated the surface structure of blended poly-3-hexylthiophene (P3HT) and CdSe active layer using Atomic Force Microscopy (AFM). Subsequently, absorption spectroscopy (UV–Vis) and photoluminescence (PL) were used for further optical property characterization. Significant quenching of PL spectra along with a larger absorption band were observed. Importantly, the capping ligand effect on the morphology and the fluorescence quenching was investigated in order to high light the role of ligand modification on the photovoltaic device performance. We reported a performance dependence of hybrid devices on the bulkiness of capping molecules. Moreover, the conversion efficiencies of the elaborated cells show an increase from 0.046% for pure P3HT to 0.46% for the hybrid composite containing Pyrr3PO-capped NCs.
中文翻译:
通过表面配体修饰优化混合 P3HT:CdSe 光伏器件
摘要 在过去的几年中,可再生能源设备越来越受到人们的关注,并且对环保高效光伏电池的追求也在继续。在常用的设计中,本体异质结由共轭聚合物供体与作为受体的半导体纳米晶体 (NC) 混合而成。这些纳米晶体是通常用作受体的富勒烯的有前途的替代品,提供更好的电子迁移率、可调带隙和更高的介电常数,以防止电荷载流子复合成激子。在这项工作中,使用粉末 XRD 和透射电子显微镜 (TEM) 合成并表征了用不同氧化膦(R3PO:R = Me2N、Et2N、吡咯烷基 (Pyrr)、哌啶基 (Pip) 或辛基)包覆的硒化镉纳米晶体 (CdSe) ) 然后,我们使用原子力显微镜 (AFM) 研究了混合聚 3-己基噻吩 (P3HT) 和 CdSe 活性层的表面结构。随后,吸收光谱(UV-Vis)和光致发光(PL)被用于进一步的光学特性表征。观察到 PL 光谱的显着淬灭以及更大的吸收带。重要的是,研究了封端配体对形态和荧光猝灭的影响,以突出配体修饰对光伏器件性能的作用。我们报告了混合设备对封端分子体积的性能依赖性。此外,精心制作的电池的转化效率从纯 P3HT 的 0.046% 增加到含有 Pyrr3PO 封端的 NCs 的混合复合材料的 0.46%。
更新日期:2020-04-01
中文翻译:
通过表面配体修饰优化混合 P3HT:CdSe 光伏器件
摘要 在过去的几年中,可再生能源设备越来越受到人们的关注,并且对环保高效光伏电池的追求也在继续。在常用的设计中,本体异质结由共轭聚合物供体与作为受体的半导体纳米晶体 (NC) 混合而成。这些纳米晶体是通常用作受体的富勒烯的有前途的替代品,提供更好的电子迁移率、可调带隙和更高的介电常数,以防止电荷载流子复合成激子。在这项工作中,使用粉末 XRD 和透射电子显微镜 (TEM) 合成并表征了用不同氧化膦(R3PO:R = Me2N、Et2N、吡咯烷基 (Pyrr)、哌啶基 (Pip) 或辛基)包覆的硒化镉纳米晶体 (CdSe) ) 然后,我们使用原子力显微镜 (AFM) 研究了混合聚 3-己基噻吩 (P3HT) 和 CdSe 活性层的表面结构。随后,吸收光谱(UV-Vis)和光致发光(PL)被用于进一步的光学特性表征。观察到 PL 光谱的显着淬灭以及更大的吸收带。重要的是,研究了封端配体对形态和荧光猝灭的影响,以突出配体修饰对光伏器件性能的作用。我们报告了混合设备对封端分子体积的性能依赖性。此外,精心制作的电池的转化效率从纯 P3HT 的 0.046% 增加到含有 Pyrr3PO 封端的 NCs 的混合复合材料的 0.46%。