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Piperazine-Assisted Construction of 2D/3D Wide-Bandgap Perovskite for Realizing High-Efficiency Perovskite/Organic Tandem Solar Cells

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Chinese Journal of Chemistry 2024年第16期42卷 1819-1827页

作者： Ziyue Wang shuaiqing kang Xia Zhou Haiyang Chen Xingxing Jiang Zhichao Zhang Jialei Zheng Ruopeng Zhang Weijie Chen Jiandong Zhang Yaowen Li Laboratory of Advanced Optoelectronic Materials Suzhou Key Laboratory of Novel Semiconductor-optoelectronics Materials and DevicesCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhouJiangsu 215123China Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Soochow UniversitySuzhouJiangsu 215123China State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials Jiangsu Key Laboratory of Advanced Functional Polymer Design and ApplicationCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhouJiangsu 215123China College of Physics and Electronics Engineering Hengyang Normal UniversityHengyangHunan 421002China

Monolithic perovskite/organic tandem solar cells(TsCs)have gained significant attention due to their easy device integration and the potential to surpass the Shockley-Queisser limit of single-junction solar ***,the surfaces of wide-bandgap perovskite films are densely populated with defects,leading to severe non-radiative recombination and energy *** a consequence,the power conversion efficiency(PCE)of perovskite/organic TSCs lags behind that of other TSC *** address these issues,we designed a functional ammonium salt,4-(2-hydroxyethyl)piperazin-1-ium iodide(Pzol),comprising a piperazine iodide and a terminated hydroxyl group,which was applied for post-treating the perovskite *** findings reveal that Pzol reacts with and consumes residual PbX_(2)(X:I or Br)to form a 2D perovskite component,thereby eliminating Pb^(0)defects,while the terminated hydroxyl group in PZOI can also passivate uncoordinated Pb^(2+).Consequently,the shallow/deep-level defect densities of the 2D/3D perovskite film were significantly reduced,leading to an enhanced PCE of single-junction 2D/3D wide-bandgap perovskite solar cells to 18.18% with a reduced energy loss of 40 ***,the corresponding perovskite/organic TSCs achieved a remarkable PCE of 24.05% with enhanced operational stability(T_(90)~500h).

关键词： Perovskite/organic tandem solar cell Defect states Piperazine ion salt Energy conversion Low-dimensional materials Perovskitesolar cells 2D/3D perovskites Efficiency

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