Li Yi, Zhu Jun, Huang Yang, Wei Junfeng, Liu Feng, Shao Zhipeng, Hu Linhua, Chen Shuanghong, Yang Shangfeng, Tang Junwang, Yao Jianxi, Dai Songyuan
Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, P. R. China.
Nanoscale. 2015 Jun 7;7(21):9902-7. doi: 10.1039/c5nr00420a.
Lead halide perovskite solar cells have attracted great interest due to their high efficiency and simple fabrication process. However, the high efficiency heavily relies on expensive organic hole-transporting materials (OHTMs) such as 2,2',7,7'-tetrakis(N,N-di-p-methoxyphenylamine)-9,9'-spirobifluorene (spiro-MeOTAD), it is preferable to replace these expensive OHTMs by inorganic and low cost materials. Here, we report colloidal PbS quantum dots synthesized by a facile method and used as the inorganic hole-transporting material in a hybrid perovskite solar cell. By controlling the crystalline morphology of the perovskite capping layer, the recombination process is significantly retarded. Furthermore, a pure inorganic solar cell prepared by a two-step process demonstrated a nearly 8% power conversion efficiency due to efficient charge separation by a cascade of junctions and retarding charge recombination by a void-free capping layer. The stability of the inorganic solar cell was also tested with a little decay observed within ca. 100 h.
卤化铅钙钛矿太阳能电池因其高效率和简单的制造工艺而备受关注。然而，其高效率严重依赖于昂贵的有机空穴传输材料（OHTM），如2,2',7,7'-四（N,N-二对甲氧基苯胺）-9,9'-螺二芴（spiro-MeOTAD），因此用无机且低成本的材料替代这些昂贵的OHTM是更可取的。在此，我们报道了通过一种简便方法合成的胶体硫化铅量子点，并将其用作混合钙钛矿太阳能电池中的无机空穴传输材料。通过控制钙钛矿覆盖层的晶体形态，复合过程得到了显著抑制。此外，通过两步法制备的纯无机太阳能电池由于通过级联结实现了有效的电荷分离以及通过无空隙覆盖层抑制了电荷复合，展现出了近8%的功率转换效率。无机太阳能电池的稳定性也经过了测试，在约100小时内观察到有轻微衰减。
