Enhanced performance of CH3NH3PbI3-x Cl x perovskite solar cells by CH3NH3I modification of TiO2-perovskite layer interface.
Enhanced performance of CH3NH3PbI3-x Cl x perovskite solar cells by CH3NH3I modification of TiO2-perovskite layer interface.
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DOI：
10.1186/s11671-016-1540-4
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发表时间：
2016-12
影响因子：
--
通讯作者：
Liu JM
中科院分区：
文献类型：
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作者：
Wang W;Zhang Z;Cai Y;Chen J;Wang J;Huang R;Lu X;Gao X;Shui L;Wu S;Liu JM
在这项工作中，采用一步法制备了以 CH3NH3PbI3-xClx 作为活性层、spiro-OMeTAD 作为空穴传输介质的钙钛矿太阳能电池（PSC）。使用不同浓度的甲基碘化铵（CH3NH3I）溶液来修饰介孔TiO2（meso-TiO2）薄膜和CH3NH3PbI3−xClx钙钛矿层之间的界面。使用 X 射线衍射、扫描电子显微镜、光学吸收、电化学阻抗谱 (EIS) 和光致发光等多种技术来研究界面改性的效果。研究发现，CH3NH3I 的界面改性提高了 CH3NH3PbI3−xClx 层的结晶度并增大了晶粒尺寸，并改善了钙钛矿前驱体在介观 TiO2 薄膜上的表面润湿性能。 PSCs在波长小于600 nm的可见光区域的太阳光吸收和外量子效率得到了提高。从 EIS 获得的奈奎斯特图表明 CH3NH3I 修饰可以降低电荷复合率。光致发光测量表明，改进装置中的激子解离比对照样品中的激子解离更有效。相对于参考（控制）装置，改进装置的光伏性能可以得到显着改善。优化浓度下的 CH3NH3I 改性器件的平均功率转换效率为 12.27%，而参考器件的平均效率为 9.68%。本文的在线版本 (doi:10.1186/s11671-016-1540-4) 包含补充材料，可供授权用户使用。
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. The online version of this article (doi:10.1186/s11671-016-1540-4) contains supplementary material, which is available to authorized users.