1] Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education of China, Department of Electronic Science and Technology, School of Physics and Technology, Wuhan University, Wuhan 430072, China [2] Department of Physics and Astronomy, The University of Toledo, Toledo, Ohio 43606, USA.
Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education of China, Department of Electronic Science and Technology, School of Physics and Technology, Wuhan University, Wuhan 430072, China.
Nat Commun. 2015 Mar 23;6:6700. doi: 10.1038/ncomms7700.
Efficient lead halide perovskite solar cells use hole-blocking layers to help collection of photogenerated electrons and to achieve high open-circuit voltages. Here, we report the realization of efficient perovskite solar cells grown directly on fluorine-doped tin oxide-coated substrates without using any hole-blocking layers. With ultraviolet-ozone treatment of the substrates, a planar Au/hole-transporting material/CH₃NH₃PbI₃-xClx/substrate cell processed by a solution method has achieved a power conversion efficiency of over 14% and an open-circuit voltage of 1.06 V measured under reverse voltage scan. The open-circuit voltage is as high as that of our best reference cell with a TiO₂ hole-blocking layer. Besides ultraviolet-ozone treatment, we find that involving Cl in the synthesis is another key for realizing high open-circuit voltage perovskite solar cells without hole-blocking layers. Our results suggest that TiO₂ may not be the ultimate interfacial material for achieving high-performance perovskite solar cells.
高效的卤化铅钙钛矿太阳能电池使用空穴阻挡层来帮助收集光生电子，并实现高开路电压。在这里，我们报告了在没有使用任何空穴阻挡层的情况下，直接在掺氟氧化锡（FTO）涂层基底上生长高效钙钛矿太阳能电池的实现。通过对基底进行紫外臭氧处理，用溶液法处理的平面 Au/空穴传输材料/CH₃NH₃PbI₃-xClx/基底电池实现了超过 14%的功率转换效率，并且在反向电压扫描下开路电压为 1.06 V。开路电压与我们具有 TiO₂空穴阻挡层的最佳参考电池相当。除了紫外臭氧处理外，我们发现在合成中涉及氯是实现无空穴阻挡层高效钙钛矿太阳能电池的另一个关键。我们的结果表明，TiO₂可能不是实现高性能钙钛矿太阳能电池的最终界面材料。
