Unprecedentedly high indoor performance (efficiency > 34 %) of perovskite photovoltaics with controlled bromine doping. (September 2020)

• Record Type: Journal Article
• Authors: Lim, Ju Won; Kwon, Hannah; Kim, Sang Hyeon; You, Young-Jun; Goo, Ji Soo; Ko, Doo-Hyun; Lee, Hyun Jeong; Kim, Dawoon; Chung, In; Kim, Tae Geun; Kim, Dong Ha; Shim, Jae Won
• Is Part Of: Nano energy. Volume 75(2020)
• Publication Date: 2020-09
• Subjects: Indoor photovoltaics -- Perovskite solar cells -- Stoichiometry-control -- Bromine doping; 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.2020.104984
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Indoor lighting-driven photovoltaic cells have significant potential for energy generation due to their ability to convert waste lighting into reusable sources and energy generation regardless of weather conditions. As a promising renewable source of energy, indoor perovskite photovoltaic cells possess the advantages of high efficiency, facile processability, and cost-effectiveness. Here, we propose stoichiometry-controlled perovskite-based photovoltaic cells illuminated under the dim light-emitting diode (LED) to capture and recycle the light sources. Among the various stoichiometric methods tested, 10% bromide-doped perovskite photoactive layers exhibit the best performance as a result of better crystallization and uniform surface. This helps to form larger grains of perovskite with reduced trap sites and defects, which suppresses carrier trapping and non-radiation recombination centers, resulting in improved device performance. Moreover, additional substitution by an appropriate halide increases the stability of the conventional perovskite by forming a pseudo-cubic phase. Consequently, the photovoltaic device examined under dim LED (1000 lx) indoor lighting exhibits an average power conversion efficiency of 34.5 ± 1.2%, which is superior by 18% compared with that of a control device (29.2 ± 1.6%). These results reveal the potential of indoor-driven perovskite photovoltaic cells as next-generation power sources which may pioneer the development of new types of indoor electronics. Graphical abstract: Image 1 Highlights: Indoor performance of Br-doped perovskite photovoltaic cells (PPCs) was investigated. Stoichiometry-optimized perovskite forms larger grains with reduced defects. The enhanced morphology minimized carrier trapping and non-radiation recombination centers. Unprecedentedly high power-conversion efficiency over 34% under 1000-lx LED was obtained.