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.
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation (NRF) of Korea , Ministry of Science, ICT & Future Planning (grant number 2016R1A3B1908249 ), Technology Development Program to Solve Climate Changes of the NRF, funded by the Ministry of Science ICT and Future Planning ( NRF-2016M1A2A2940912 ), and Basic Science Research Program through the NRF, funded by the Ministry of Education ( NRF-2018R1D1A1B07043759 ). This work was also supported by NRF of Korea Grant funded by the Korean Government ( NRF-2020R 1A 2C 3003958 ; 2015M1A2A2058365 ) and by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government (MOTIE) (No. 20173010013340 ). We appreciate Prof. Jong Hyeok Park and Jung Hwan Lee for the fruitful discussion and support for the device fabrication.
© 2020 Elsevier Ltd
- Bromine doping
- Indoor photovoltaics
- Perovskite solar cells