Low-temperature solution-processed Li-doped SnO2 as an effective electron transporting layer for high-performance flexible and wearable perovskite solar cells. (August 2016)

• Record Type: Journal Article
• Authors: Park, Minwoo; Kim, Jae-Yup; Son, Hae Jung; Lee, Chul-Ho; Jang, Seung Soon; Ko, Min Jae
• Is Part Of: Nano energy. Volume 26(2016:Aug.)
• Page Start: 208
• Page End: 215
• Publication Date: 2016-08
• Subjects: Flexible solar cell -- Perovskite solar cell -- Low temperature and solution process -- Tin oxide; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2016.04.060
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Lead halide perovskite solar cells (PSCs) are thought to be promising energy power suppliers because of their feasibility for high power conversion efficiency (PCE), light weight, and flexible architecture. The preparation of charge transporting layers at low temperature has been essential for high-performance and flexible PSCs. Recently, low-temperature-processed metal oxides have been a desirable material for charge transport and air stability for PSCs, instead of organic semiconductors. However, pristine metal oxides fabricated at low temperature have still precluded high performance of the device because of their low conductivity and large deviation in energy levels from the conduction band or valance band of the perovskite. Therefore, doping metals in the metal oxides has been considered as an effective method to endow suitable electrical properties. Herein, we developed a highly efficient electron transporting layer (ETL) comprising Li-doped SnO2 (Li:SnO2 ) prepared at low temperature in solution. The doped Li in SnO2 enhanced conductivity as well as induced a downward shift of the conduction band minimum of SnO2, which facilitated injection and transfer of electrons from the conduction band of the perovskite. The PCE was measured to be 18.2% and 14.78% for the rigid and flexible substrates, respectively. The high-performance and flexible PSCs could be potentially used as a wearable energy power source. Graphical abstract: Highlights: Li:SnO2 and SnO2 are used as an electron transporting layer in perovskite solar cells. The performance of the devices is enhanced after Li-doping in SnO2 . Low-temperature and solution process realize high-performance wearable perovskite solar cells.