Stable and low-cost solution processed perovsktie solar cells using a PTFE buffer layer
作者单位：State Key Laboratory on Integrated Optoelectronics College of Electronic Science and Engineering Jilin University
会议名称：《第二届新型太阳能电池学术研讨会》
会议日期：2015年
学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）]
关 键 词：solution processed low temperature perovskite solar cells PTFE buffer layer
摘 要：Organometal halide perovskite solar cells have achieved high power conversion efficiency(PCE) value of 6% using TiO-based structure[1]. The high performance is due to the strong light absorption, weak exciton binding energy and long hole-electron diffusion length[2,3]. In the TiO-based perovskite solar cells, the compact TiO layer requires high temperature treatment about 450℃. However, high temperature process is not suitable for flexible substrates or ITO substrates. The solution processed perovskite solar cells have attracted great attention for their low temperature treatment, low cost and flexibility. The latest reported PCEs of solution processed perovskite solar cells have been over 14%[4]. There is considerable spaces for further enhancement of devices efficiency by optimizing the perovskite film morphologies and device architectures. Here, we fabricated a solution processed perovskite solar cells using PTFE as a buffer layer. The CHNHPbICl layer was used as light absorber in the solar cells. A thin film of PTFE was evaporated on the top of ITO substrate. The open-circuit voltage and efficiency have significantly increased by introducing PTFE layer. The PCE was 7.81%, with an open-circuit voltage of 0.83 V, a short current density of 17.93 mA/cm, and fill factor of 52.48%. The performance will be optimized in our future work.