کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6457342 | 1420663 | 2017 | 7 صفحه PDF | دانلود رایگان |
- A glass-forming perylenediimide derivative was used as an interfacial layer in perovskite-based photovoltaic cells with solution-processed TiOx as electron transport layer.
- Efficiency enhancements up to 39% were obtained at an optimal thickness of 10Â nm.
- The addition of this interfacial layer leads to larger perovskite nanostructure formation.
- Charge transfer between the perovskite and interfacial layers was improved.
The efficiency of organometallic halide photovoltaic cells can be improved by interfacial modification of the titanium oxide (TiOx) electron collecting layer by a thin layer of an organic material. Enhancements of power conversion efficiency up to 37% were obtained with PC61BM, but the performance is highly dependent on processing conditions and PCBM is still an expensive material. Herein, a glass-forming perylenetetracarboxylicdiimide derivative (PDI-glass) was used as interface material. The devices were optimized with varying PDI-glass thickness. With an optimal 10Â nm-thickness, a power conversion efficiency increase of 39% were obtained, with an increase in short-circuit current from 9.7 to 11.05Â mAÂ cmâ2 and fill factor from 0.51 to 0.61. Aside from the thickness of the PDI-glass layer, the process yields consistent results independent of the processing conditions. Photoluminescence spectra revealed the presence of charge transfer at the PDI-glass - active layer interface. The films were further studied by X-ray diffraction (XRD), atomic force microscopy (AFM), and scanning electron microscopy (SEM).
148
Journal: Solar Energy Materials and Solar Cells - Volume 160, February 2017, Pages 294-300