期刊
NANOSCALE RESEARCH LETTERS
卷 11, 期 -, 页码 -出版社
SPRINGEROPEN
DOI: 10.1186/s11671-016-1540-4
关键词
CH3NH3I; Interfacial modification; CH3NH3PbI3-xClx perovskite solar cells; Photoelectronic properties; Performance
资金
- National Natural Science Foundation of China [51431006, 61271127, 51472093, 21303060, 61574065]
- Guangdong Natural Science Foundation [2016A030313421]
- Guangdong Engineering Technology Center of Optofluidics Materials and Devices [2015B090903079]
- International Science and Technology Cooperation Platform Program of Guangzhou [2014 J4500016]
- State Key Program for Basic Researches of China [2015CB921202]
- Project for Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme
- Science and Technology Planning Project of Guangdong Province [2015B090927006]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT13064]
In this work, perovskite solar cells (PSCs) with CH3NH3PbI3-xClx as active layer and spiro-OMeTAD as hole-transport media have been fabricated by one-step method. The methylammonium iodide (CH3NH3I) solution with different concentrations is used to modify the interface between mesoporous TiO2 (meso-TiO2) film and CH3NH3PbI3-xClx perovskite layer. Several techniques including X-ray diffraction, scanning electron microscopy, optical absorption, electrochemical impedance spectroscopy (EIS) and photoluminescence are used to investigate the effect of the interfacial modification. It is found that the interfacial modification by CH3NH3I enhance the crystallinity and increase the grain size of CH3NH3PbI3-xClx layer, and improve the surface wetting properties of perovskite precursor on meso-TiO2 film. The sunlight absorption and external quantum efficiency of PSCs in the visible region with wavelength less than 600 nm have been improved. The Nyquist plots obtained from the EIS suggest that the CH3NH3I modification can reduce the charge recombination rates. The photoluminescence measurement shows that the exciton dissociation in the modified devices is more effective than that in the control samples. The photovoltaic performance of the modified devices can be significantly improved with respect to the reference (control) devices. The CH3NH3I modified devices at the optimized concentration demonstrate the average power conversion efficiency of 12. 27 % in comparison with the average efficiency of 9.68 % for the reference devices.
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