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Bulk-heterojunction polymer photovoltaic cells manufactured using non-halogenated and non-aromatic solvent
摘要： The use of photovoltaic devices as converters of solar energy into electricity is a relevant technology to the global energy needs and, at the same time, it mitigates the negative impact on the environment caused by conventional sources. Although polymer solar cells are properly considered as clean and renewable source of electricity production, the processing involved in the manufacture of such devices still contains toxic elements. The formation of thin films of active layer in bulk-heterojunction organic solar cells, as example, usually uses halogenated solvents as chlorobenzene (CB), dichlorobenzene (DCB), or chloroform (CF), which represent certain risks of toxicity to the human body and to the environment. This work aims to show that it is possible to manufacture organic solar cells using less-toxic solvents, in special to the environment, whose final efficiency results are similar to those that have been processed by conventional halogenated solvents. With the aid of the Hansen solubility parameters (HSP), we identified non-halogenated and non-aromatic solvent that showed chemical compatibility with donor polymers and acceptor molecules used in the device’s active layer. The fabricated devices were then characterized and their photovoltaic responses compared to the conventional equivalents.
关键词： non-halogenated solvents,polymer solar cells,photovoltaic devices,non-aromatic solvents,solar energy,halogenated solvents,Hansen solubility parameters
更新于2025-09-23 15:21:01
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All Green Solvents for Fabrication of CsPbBr <sub/>3</sub> Films for Efficient Solar Cells Guided by the Hansen Solubility Theory
摘要： Toxic solvents used in the fabrication of perovskite solar cells are an obstacle for their commercialization. Replacing those toxic solvents with green solvents is very important for both ecological environment safety and the health of operators working in manufactory and labs. CsPbBr3-based solar cells have attracted increasing attention due to its high stability. Herein, high-quality CsPbBr3 films are prepared using all green solvents based on a two-step spin-coating method. In the first step, a green solvent system of polyethylene glycol (PEG) with the addition of γ-butyrolactone is used for preparing PbBr2 solutions by matching the Hansen solubility parameters (HSPs) between PbBr2 and the mixed solvent system. By optimizing the HSPs and viscosity, a new complex of PbBr2·(PEG) is formed by spin-coating from the PbBr2 solution, followed by acetic acid dropping while spinning. In the second step, green water is used to dissolve CsBr to prepare a high concentration CsBr/H2O solution. High-quality CsPbBr3 films with full coverage are obtained by spin-coating CsBr/H2O solution onto the PbBr2·(PEG) films after annealing. As a result, a solar cell with configuration of fluorine-doped tin oxide/TiO2/CsPbBr3/carbon exhibits a power conversion efficiency of 8.11% due to its high-quality harvest layer.
关键词： perovskite solar cells,green solvents,Hansen solubility parameters,CsPbBr3,toxicity
更新于2025-09-19 17:13:59