Graphdiyne-modified cross-linkable fullerene as an efficient electron-transporting layer in organometal halide perovskite solar cells. (January 2018)

• Record Type: Journal Article
• Authors: Li, Meng; Wang, Zhao-Kui; Kang, Tin; Yang, Yingguo; Gao, Xingyu; Hsu, Chain-Shu; Li, Yuliang; Liao, Liang-Sheng
• Is Part Of: Nano energy. Volume 43(2018)
• Page Start: 47
• Page End: 54
• Publication Date: 2018-01
• Subjects: Perovskite solar cells -- Cross-linkable fullerene -- Graphdiyne -- Face-on orientation; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2017.11.008
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Interface engineering resulting in good contact, enhanced transport capability, and matched energy levels is indispensable and critical for the development of high-performance planar perovskite solar cells (PSCs). Here, we report an excellent electron-transporting layer (ETL) that can simultaneously enhance the stability and efficiency of n-i-p planar PSCs. Large π-conjugated graphdiyne (GD) was introduced into cross-linkable fullerene [6, 6]-phenyl-C61-butyric styryl dendron ester (PCBSD) to improve the film orientation. Raman spectroscopy and 2D grazing incidence X-ray diffraction (GIXRD) measurements revealed that a strong π–π stacking interaction occurred between GD and cross-linkable PCBSD (C-PCBSD), generating a face-on stacked composite film. The orientated C-PCBSD:GD films was favorable for the growth and crystallization of the subsequent perovskite films and provided the merits of superior electron mobility, efficient charge extraction and energy-level tailoring. In addition, the thermally annealed C-PCBSD:GD film provided an adhesive film network with sufficient solvent resistance. Consequently, the perovskite devices delivered a power conversion efficiency of 20.19% with obviously improved cell stability. This indicates a potential application of GD-modified cross-linkable fullerene as an ETL in n-i-p structure PSCs. The finding opens a new route to deposit the fullerene films with ordered orientation by 2D materials with large π-conjugation, and thus to control the subsequent perovskite crystallization. Graphical abstract: Highlights: Graphdiyne-modified cross-linkable fullerene was developed as an ETL in perovskite solar cells. The face-on orientation composite film is favorable for the growth and crystallization of the perovskite. A perovskite solar cell with PCE of 20.19% is achieved with evidently improved cell stability. A new route to deposit the fullerene films with ordered orientation by 2D materials with large π-conjugation.