کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6456833 | 1420653 | 2017 | 9 صفحه PDF | دانلود رایگان |

- A PVDF-HFP additive specific to semitransparent perovskite films was developed.
- The additive has significant effects on perovskite-film-morphology control.
- The additive improves carrier lifetimes and decreases charge transport resistance.
- The additive achieves over 30% PCE enhancement compared to control devices.
Organometallic halide perovskite solar cells have considerable potential to be manufactured as low-cost and visible-light-semitransparent modules by reducing the thickness of the perovskite films for building-integrated photovoltaics. However, perovskite films often suffer from voids and roughness, inducing depressed photovoltaic performance, and this problem is even more severe for thinner perovskite films. Herein, a poly(vinylidenefluoride-co-hexafluoropropylene) (PVDF-HFP) additive is incorporated into CH3NH3PbI3 precursor solutions to control the crystal growth of a visible-light-semitransparent perovskite layer (thickness: ~150Â nm) in a one-step deposition process. The characterization results show that the coverage and smoothness of the perovskite films can be significantly improved, and the perovskite crystal boundaries are also reduced by introducing a moderate amount of PVDF-HFP. When the precursor solution containing 12Â mg/mL PVDF-HFP, the highest power conversion efficiencies of 10.6% and 8.8% (backward scan) is achieved for the photovoltaic devices with 80 and 20Â nm-thick Au electrode, respectively, which is over 30% higher than that of the PVDF-HFP-free control. Time-resolved photoluminescence and electrochemical impedance spectroscopy characterizations further demonstrate that the PVDF-HFP additive can improve the carrier lifetimes and reduce the charge transfer resistance, which contributes to the enhanced photovoltaic performance. Thus, we propose a strategy specific to a high-quality visible-light-semitransparent perovskite layer and for high-performance perovskite solar-cell preparation.
353
Journal: Solar Energy Materials and Solar Cells - Volume 170, October 2017, Pages 178-186